bluuebunny/crossref_metadata_2025 huggingface dataset:
Structural design and experimental study on mechanical properties of sand column support
Authors: Qi Donghe , Ru Xinhua , Li Dayong , Chu Fuyao , Zhang Jingkai
Published: November 2019

In order to solve the problem of insufficient support strength caused by unreasonable structure design of roadway side retaining roadway along goaf in zhubai Coal Mine, and by means of preliminary test of bearing capacity, theoretical calculation and mechanical experiment of sand pillar, the optimization design of supporting structure of gob-side entry retaining was carried out. The results show that when the ratio of sand and stone material filled with sand column is 1:1 and the filling material is vibrated by adding water, the density of filling material reaches the maximum and the stability of sand column is optimal; When the pressure gauge reading is 32 MPa, the lower part of the sand column is in the basic fracture state and the watersand column can bear more ultimate load than the water-sand column. It is proved that the optimized sand pillar support body can meet the support strength requirements of gob-side entry retaining and improve the production efficiency.
Analysis of lateral seismic response internal force of circular shield tunnel
Authors: Yuan Yuan , Wang Sihai , Zhou Nan
Published: November 2019

With the acceleration of urbanization in China, large-scale tunnel engineering has developed rapidly. The anti-seismic problem of tunnel engineering has become a research hotspot in the field of geotechnical seismic engineering. In this paper, the basic solution method of the orifice problem in the elastic theory is used to solve the internal force of the tunnel earthquake. The results show that the internal force of the tunnel structure is distributed along the circular tunnel in the shape of a goose egg. The larger the peak acceleration of the input seismic wave, the stronger the internal force of the tunnel structure. The conclusion provides a basis for anti-seismic design calculation of shield tunnel.
Spatial characters of road network in Beijing and its relations with runoff risk based on GIS
Authors: Zhao-ming Wang , She-gang Shao , Yi Shen
Published: November 2019

Urbanization increases the urban area of storm flood disaster risk, the quantitative study of urban rainfall runoff characteristics, can provide a scientific basis for the scientific planning and management of the city. Rings with the area of Beijing as the research object, by using GIS technology to extract the rings in land cover information, combined with the functions of the different regions use partition. On the basis, combining with SCS-CN hydrological models in the study area have been analyzed for different rainfall return period of rainfall runoff distribution characteristics, and quantitative identification of the risk area of flow produce rings in Beijing area. Rings in runoff yield risk pattern shows a center of high and low around the circular distribution, high flow risk zones mostly distributed in the center of the city’s commercial and residential areas, low flow risk zones are mainly large park and natural green space, distributed between the fourth and the rings.
Application of Ground Penetrating Radar Numerical Simulation Technology in Quality Inspection of Reclamation Embankment
Authors: Lu Wei , Yang Jiangong
Published: November 2019

Ground detection radar detection technology is an effective and feasible nondestructive testing technology for the quality inspection of reclamation embankment engineering. It has the advantages of high detection precision, high speed and continuous detection, but it is restricted by environmental conditions, which reduces the detection efficiency. Based on the FDTD algorithm, the forward modeling of overhead hidden danger in the reclamation embankment is carried out, and the typical radar image is obtained. The radar image characteristics of the reclamation embankment are summarized, which provides a theoretical basis for the application of ground penetrating radar to identify abnormal bodies in engineering practice.
Research on Component Recycling Based on Steel Structure Prefabricated Building
Authors: Qiao Chunzhen , Pan Qi , Zhang Zhe , Hu Peihao
Published: November 2019

The steel structure building system is a system suitable for resource recovery. This paper studies the carbon emission calculation model and economic analysis method for the recovery process of steel structure prefabricated building components. And a steel structure sales office is selected for verification calculation. The results show that the use of recycled components within a reasonable transport distance can not only reduce carbon emissions, but also reduce economic costs compared to the full use of new components.
Case study on the model test of staggered-jointed assembling shield tunnel structure reinforced by bonded steel plates under large deformation
Authors: Liu Xue-zeng , Lai Hao-ran , Sang Yun-long
Published: November 2019

Transverse large deformation is one of the main diseases of metro shield tunnels, gravely threatening the safe operation of tunnel structure. Reinforcing bonded steel plates is a primary means for repairing excessively deformed tunnels. Nevertheless, evaluations and analyses on the reinforcing effect of bonded steel plates are currently unclear. Therefore, destruction tests were performed on the tunnel without the reinforced structure and on the excessively deformed tunnel with the reinforced structure respectively with the similar model test method in this paper, so as to analyse deformation behaviours and failure modes of segment lining and compare the reinforcing effect. Test results show that the carrying capacity of the tunnel structure can still be improved through reinforcing the staggered-jointed assembling shield tunnel with bonded steel plates under large deformation; also, the reinforcement of bonded steel plates can effectively prevent the tunnel from deforming. The failure mode of the reinforced structure consists of the reinforcement interface debonding failure and steel plate bending failure. To be specific, the debonding failure being frequently detecting in seams is composed of slab staggering and expansive debonding. Research achievements in this paper may provide theoretical and data support for similar reinforcement projects.
Shaking table investigations on the seismic performance of a steel frame with optimized passive energy dissipation devices
Authors: Jaisee Sujit , Yue Feng , Chen Liang , Yin Wenhan , Gong Hai , Wang Chenyang
Published: November 2019

In this study, the seismic responses of two kinds of optimized metallic energy dissipation devices (EDDs) are investigated by conducting shaking table tests on two storey full-scale steel frame model. The dampers are installed in pairs between the beams and corresponding cross bracings on each storey of the model. Then the whole setup, with and without dampers are subjected to different seismic waves with Peak Ground Accelerations (PGAs) of 0.14g, 0.40g, 0.62g and 0.90g with various configurations. In this paper, the dynamic properties, seismic responses and damage details of these distinct setups are recorded, analyzed and compared between controlled and uncontrolled structures. Thus obtained result shows that the effect of these kinds of dampers on acceleration and displacement are quite significant. This study lays down a firm foundation for the reliability of these kinds of passive energy dissipation devices on the basis of deeper research investigations.
Comparative Study on the Style of Commercial Streets in Traditional Ancient Villages in Gui-Xiang-Gan-Wan Area
Authors: Yiming Wang , Ke Gong
Published: November 2019

Using literature review, field survey, historical connection and comparative analysis four kinds of research methods, combined with urban space theory, street space theory and environmental psychology theory, and nature, climate, geography, history and social conditions of village, the landscape characteristics of the commercial streets of eight traditional villages in the Gui-Xiang-Gan-Wan Area are compared. The research content focuses on the interface along the street, the node landscape and the street section. The conclusions show that there are differences in the activities, architectural forms, commercial atmosphere expression, living atmosphere expression, spatial aesthetic expression and transportation mode of these commercial street spaces in ancient village; but it is the same in terms of aesthetic needs, cultural expression needs, designing ideas according to local conditions, and designing reference behaviors. In the end, it is further pointed out that “reference”, “integration”, “innovation” and “inheritance” should be regarded as the ideological principles of the protection and construction of ancient villages in Guilin.
Finite element simulation analysis of reinforced concrete large haunched slab under fire
Authors: Xu Xinghuan , Zhang Xiaojie
Published: November 2019

The finite element software ABAQUS is used to set up the model of large haunched slab.By using the sequential thermal stress coupling calculation method,the validity of the data model is proved by comparing with the experimental results.On the basis of this,the fire resistance of large haunched slabe is analyzed.The fire resistance limit of large haunched slabe with different thickness of protective layer is obtained,which provides reference for the fire resistance design of large haunched slab.
Research on Humanized Design Strategy of Overseas Construction Camp
Authors: Zhang Kesheng
Published: November 2019

This paper analyses the meaning of overseas construction camp design of chinese contractors, and summarizes the research status of construction camp buildings at home and abroad. Based on the existing research, some suggestions and ideas for humanized design of construction camp are given, which can provide references for humanized design of overseas construction camp in the future.
Effect of Different Parameters on Axial Compressive Behavior of Angle Steel Confined Reactive Powder Concrete Short Columns
Authors: Xu Ming , Song Zhanfeng , Zhang Wang , Yang Maomao , Ji Jing
Published: November 2019

This paper presents the mechanical performance of angle steel confined reactive powder concrete (ARRPC) short column under axial compression. A series of analysis were carried out on eleven specimens using RPC, batten plate spacing and slenderness ratio as parameters. The steel model the simplified bilinear constitutive model and RPC model was defined by the nonlinear constitutive model considering hoop effect, then the static simulation of ARRPC short column was carried out by ANSYS. The outcomes of analytical procedures mostly match well with the experimental results, so the rationality of the material constitutive model and the finite element model was verified. Based on this, the static behaviour analysis of eleven groups of ARRPC short column was carried out, and the load-displacement curves of the specimens were obtained. The effect of different parameters on the ultimate bearing capacity of the specimens was investigated. The numerical investigations show that when RPC strength is high, the specimens exhibit relatively large bearing capacity, while slenderness ratio and batten plate spacing increase, the ultimate bearing capacity of the specimen decreases. Finally, it can help propose the calculation formula of the bearing capacity of composite columns.
Experimental Study on Mechanical Properties of New Recycled Concrete Composite Beams
Authors: Pei Junjie , Fang Guangxiu
Published: November 2019

We made one of the new composite beam-column joint as tested specimen, and four specimens. By doing the model test under static load, we got some experimental results about specimens. For example, the cracking load, the ultimate bearing capacity, the load-deformation curves and the mechanical characteristic of the composite area of beam-column joint. We get conclusions as follow. The values of cracking load and ultimate bearing capacity of the new composite mixed using concrete and recycled concrete can be calculated by the formulas in Code for design of concrete structures (GB 50010-2010). As the structural style of the whole Cast-in-situ concrete specimen and the new composite mixed using concrete and recycled concrete is different, the law of the development of the deflection is similar, and we put forward modifier formula for calculating the bending rigidity. Adopting the structural with step-shaped composite area at the end of beam is useful for prevent cracks from running on, and the method can enhance its bearing capacity.
Research on Renovation Planning of Traditional Hutong—Take Beijing Juer Hutong Renovation Project as Axample
Authors: Chen Hongyu , Zhang Huaping
Published: November 2019

The architectural language of traditional hutong plays a carrier role in local history and culture. The traditional hutong architectural language is refined as a prototype, and some essence is extracted from the architectural ontology and transmitted to the new hutong design, so that the new hutong architecture has certain social and humanistic thoughts. It also has contemporary characteristics, which is the current direction of hutong renovation. This paper conducts pre-design planning research on the renovation project of contemporary juer hutong in Beijing, and explores various techniques in the renovation and reconstruction design of contemporary traditional hutong.
Experimental Study on Cracking Resistance of Recycled Concrete Beams Reinforced with Hybrid Polyacrylonitrile and Recycled Fibers
Authors: Cui Xian , Pei Chang-chun , Chi Cui-ping
Published: November 2019

In order to improve the comprehensive performance of the recycled concrete, reduce the waste of natural resources and environmental pollution, fly ash and recycled concrete aggregates were mixed into the reference concrete group RC0 to partially replace cement and natural coarse aggregates, respectively. The basic mechanical properties of five groups of recycled concrete reinforced with recycled fibers and organic fibers in different combinations were analyzed. In addition, the cracking resistance, failure process and bearing capacity of each group of recycled concrete beams were also studied. The test results and corresponding analysis showed that: the damage process of concrete beams reinforced with hybrid polyacrylonitrile fibers and recycled fibers was basically the same as that of ordinary concrete beams; the development of cracks is more effectively prevented with the increase of the proportion of waste fibers; the use of recycled waste fibers and polyacrylonitrile can significantly improve cracking resistance, deformation resistance, and load carrying capacity of recycled concrete beams.
Operation and cohesion strategy of hub airport ground based on the background of multi-terminal areas
Authors: Zhang Xiaorong
Published: November 2019

With the continuous rise of the aviation industry, its business volume increases, about which the problem brought is urgent to solve. For example: traffic pressure around the airport, road congestion and other problems. Based on the analysis of existing problems, this paper analyzed the current problems and explored on the source in view of the hub airport ground operation; Based on the comprehensive transport hub airport cohesion, it optimized guidelines and factors affecting hub airport traffic, built ground operation and cohesion strategy under the background of multi-terminal areas, and put forward the strategy of taking priority of developing highway traffic to solve the problem of airport ground cohesion, aiming at better developing aviation industry.
Research progress of turbulence characteristic parameters in bottom boundary layer
Authors: Fang Chong , Hao Jialing
Published: November 2019

The bottom boundary layer in estuaries and coastal waters is an area where water flows interact with the bottom bed, and its flow structure is very complex. The influence on the bed morphology, energy and material exchange, circulation and other processes can not be ignored. With the rapid development of technology, the measurement methods of the parameters of the bottom boundary layer are more mature, and the measurement and analysis of turbulence are more in-depth. In addition, the study of the bottom boundary layer has a great role in promoting the development of other similar disciplines, and its application value is increasingly obvious. This paper presents the latest progress in the study of turbulent characteristic parameters of the bottom boundary layer in estuaries and coastal waters, including measurement methods, frictional velocity, bottom roughness length and bottom drag coefficient. These achievements are summarized and analyzed, and the shortcomings of the current research are discussed, and the future research is prospected.
Indoor Rheological Test and Creep Model Analysis of Soft Soil in Qingyi River region in Wuhu Anhui
Authors: Zhao Xinming , Wang Qianwen , Gao Yifei , Yang Tao , He Lichao , Lu Xuxu
Published: November 2019

The shear strength and the failure deviatoric stress of the Wuhu soft soil under different confining pressures were determined by indoor undrained consolidation triaxial rheological tests. Selecting 20%, 40%, 60% and 80% of the failure deviatoric stress as deviatoric stress and 100kPa, 200kPa and 300kPa as confining pressures, the rheological tests were conducted by separate loading method. Based on the creep curves obtained from the rheological tests, the related model parameters were determined after modifying the stressstrain and strain-time relation of Singh-Mitchell and Mesri creep model. And the empirical creep model was obtained, of which the stress-strain and strain-time relation were expressed in the form of power function. The analysis indicated that the creep characteristics of Wuhu soft soil was described more accurately by the new empirical creep model than Singh-Mitchell and Mesri creep model.
Study on Framework Design of Smart Water Management System in Shenzhen
Authors: Zhu Xiaoqing , Yin Zhijie , Liu Yong , Feng Bo , Wang Yan
Published: November 2019

Given the current situation and major problems in the development of water affairs informatization in Shenzhen, we put forward the following objectives for construction of a smart water management system – “to see the whole view through one map”, “to know everything through one click”, “to monitor all through one station” and “to manage water - resource affairs through one machine”. To meet these objectives, we proposed an overall framework of the smart water management system consisting of five levels (intelligent sensing, infrastructure, big data of water affairs, intelligence application and intelligence portal), two main sub-systems (standard and information security) and the main construction tasks of “1+3+N”. In the end, we analyzed the expected benefits of the smart water management system in hopes of providing a basis to promote construction of an overall smart system in Shenzhen in an all-round manner.
Improvement research of flood routing model in Aksu River basin
Authors: Wang Qin , Liu Yong , Zhang Xiangping , Yaquan Ba
Published: November 2019

To optimize the existing flood control plan of Aksu River basin and strengthen the flood control management during the flood season, the flood routing of Aksu River is studied based on the improved Muskingum method. Firstly, to make up for the shortcomings of the traditional Muskingum method in flood routing of double tributaries, the parameters of single tributary are further improved. Then, the improved Muskingum method is used to simulate and validate the flood process of Shaliguilanke, Xiehela and Xidaqiao hydrometric stations in Aksu River from 1999 to 2016. The results show that: (a) In the main stream of Aksu River, the flood of Xidaqiao Hydrometric Station is mainly caused by the water coming from Xiehela Hydrometric Station, while the flood caused by the water coming from Shaliguilanke Hydrometric Station and two stations (Shaliguilanke Hydrometric Station and Xiehela Hydrometric Station) is less. (b) We classified the main streams of the above three situations by flood peak level, and then carried out flood routing. The calculating parameters under the same flood peak level all show strong integrity, and the fitting degree between the simulated process and the observed process is relatively high. The parameters K and x inversely deduced under the condition of the inflow of Xiehela Station as the main source have more physical significance.
Respirable dust detection and optimization of dust prevention measures in fully mechanized face of coal mine
Authors: Wei Yinshang , Li Jiawen , Wang Jiaojiao
Published: November 2019

With the deepening of coal mining depth, mining scale and mechanization, the widespread use of high-power, high-performance automated coal mining equipment has increased the amount of dust generated in coal mines during various operations, which has seriously affected the coal mines normal mining and the health of miners. In order to study the harm of respirable dust in fully mechanized coal mining face and reduce the degree of dust hazard, individual sampling and fixed-point sampling method were used to detect the contact level of dust in different types of fully mechanized coal mining face in Shaanxi Province. The test results show that shearer drivers, stent workers and other five types of jobs are the most serious in fully mechanized coal mining face. Analyze the reasons for the excessive concentration of dust in different positions, put forward the optimization measures, so as to further improve the efficiency of mine dust control.
Surface Water Information Extraction Based on High-Resolution Image
Authors: Lai Yuequn , Zhang Jing , Song Yongyu
Published: November 2019

Remote sensing image is an important information source for fast acquisition of information on the earth’s surface. The extraction of high-resolution satellite remote sensing image information has also gradually increased. Based on high resolution image, this paper discusses its main characteristics, current research progress, main interpretation methods and similarities and differences with traditional interpretation methods, and further research is discussed. An example of surface water information extraction for Miyun Reservoir, China based on Landsat-7 image is preliminary explored. It provides a good reference for choosing different interpretation methods for different research purposes or situations.
Impact of Human Activities on Flood Control Capacity of Southern Jiangsu Province in Taihu Basin
Authors: Xu Tianyi , Liu Keqiang
Published: November 2019

Southern Jiangsu Province in Taihu Basin is one of the regions with high urbanization degree in China. In recent years, with the continuous progress of urbanization, the human activities, have further increase the pressure of flood disasters. This paper analyzed the trends of most significant human activities, namely the land use pattern, surface water storage capacity, and construction of polder areas and urban flood control projects; simulated the water yield and water level of regional river network by using a digital watershed model. The results indicated that in the past decades, the construction land expanded significantly, the capacity of flood storage decreased gradually, and the drainage module increased by large-scale construction of polder areas and urban flood control projects. The change of these factors would lead to the increase of the regional water yield and rise of flood level of river network, which would further increase the flood risk of the region.
Evaluating the vulnerability of agricultural drought in Hetao Irrigation Area of Inner Mongolia Based on super efficiency DEA
Authors: Huang Jing , Fu Peng , Tong Jinping , She Jingwen , Zhang Jingxuan
Published: November 2019

Drought vulnerability has become a key point for agricultural sustainable development in such a changing context. In this study, Hetao Irrigation Area which is the major grain-producing area is selected as the research area, where frequent drought threatens food production. Firstly, super efficiency data envelopment analysis (SEDEA) model is used to evaluate the agricultural drought vulnerability of Hetao Irrigation Area from 1997 to 2016. And then the spatial and temporal differences of vulnerability are analyzed. Moran’s I Index is also adopted for further spatial autocorrelation analysis. The results show that the vulnerability decreases with the investment of agricultural science and technology, and the drought vulnerability in different irrigation fields are affected by the irrigation area coverage rate. The drought vulnerability is much higher in the east of Hetao Irrigation Area than that in the west due to the worse water supply in the east. And the vulnerability in Wuyan is the highest due to the largest cropping sown area, while Linhe stays the lower value due to the highest GDP.
Influence Mechanism of County Scale and Structure on the Household Carbon Emissions and its Planning Strategies
Authors: Feng Lanmeng , Zhang He , Wang Rui
Published: November 2019

In order to achieve China’s national contribution goal of 60% to 65% reduction in CO2 intensity per unit of GDP from 2005-2030 at the climate conference in Paris, China needs to make more efforts in low carbon development. The county is an important level for China’s urban-rural carbon and oxygen planning, and it still has a large potential for carbon emission reduction. This study mainly explores the influence mechanism of county scale and structure on household carbon emissions. First of all, I build a county scale and structural factor index system, and analyse the impact mechanism on this basis. Secondly, I select 10% of the county-level administrative units, and empirically analyse the relationship between factor indicators and the household carbon emissions in terms of population, economy and land use. Finally, based on the results of the empirical analysis, the impact mechanism is re-discussed, and the corresponding county planning strategy is proposed accordingly. The results of this study and policy recommendations have guiding significance for promoting institutional arrangements for low-carbon development in counties.
Application research of BIM5D technology in engineering projects
Authors: Jiao Chen , Xinming Zhao , Hongna Yang , Tao Yang , Jiayong Wang
Published: November 2019

Based on BIM technology, BIM3D model is built through Autodesk Revit software, structural conflicts and collisions are checked through Autodesk Navisworks Manage software, and construction simulation is conducted, so that BIM5D information base is integrated with new point cloud 5D calculation software and new point list cost software which realizes 5D management. By means of construction simulation for further optimization model, the fine management of construction process is realized.
Study on Treatment of Uranium-Containing Wastewater by Biosorption
Authors: Hu Juntong , Lv Yijin , Cui Wei , Chen Wansi , Li Shiyou
Published: November 2019

This paper is going to introduce the research status of the treatment of uranium-containing wastewater by biosorption; the definition and advantages of biosorption technology and the types of biosorbents; the effects of pH, temperature and coexisting ions on the adsorption efficiency of biosorption; and the mechanism of biosorption of metals: precipitation, cell enrichment, oxidation and reduction, and enzymatic action. Finally, it provides a direction for further research in the future.
Study on Optimal Parameters Optimization of High Drilling Field Based on the Theory of “Three Vertical Zones” of Overlying Strata
Authors: Pi Xiyu
Published: November 2019

In order to make gas accumulation at the corner of 2106 working face safer, this paper analyzes the mechanism of high-level boreholes field when eliminating the gas accumulation of upper corner using theoretical analysis, numerical simulation and field measurement method, calculates the optimal position of high boreholes based on the theory of “three vertical zones” of overlying strata, and verifies the corresponding numbers using FLAC3D software. In this way, this paper optimizes the optimal layout parameters of the high-drilling field through on-site inspection and eliminates the danger caused by the gas accumulation in the upper corner.
The secondary nature and light absorption properties of water-soluble organic carbon in the winter of Beijing
Authors: Li Anna , Deng Xueliang , Yang Nana , Zhou Jiacheng
Published: November 2019

From December 26th to 28th, 2014, Beijing was hit by the regional severely polluted weather, during which the daily average mass concentration of PM2.5 was three times that of non-polluted days. Water-Soluble Organic Carbon (WSOC) concentrations (6.8 μg C/m3) in the polluted day were four times that of the non-polluted day (1.7 μg C/m3). The high correlation between WSOC and Secondary organic carbon (SOC) indicated that WSOC and SOC shared similar source and formation mechanism. The high correlation between WSOC and biomass burning tracer (K+) indicated that biomass burning was an important source of WSOC in winter. This paper measures the light absorption intensity of water-soluble brown carbon on the average light absorption (Abs365) of WSOC between 360mm and 370 nm. The absorption spectrum analysis of WSOC showed that Abs365 ranged from 0.80-15.26 with an average of 3.7 Mm−1. The AAE value was 3.42 with the fluctuation range between 1.8 and 7.7. The mean value of MAE was 1.87 m2/g, with no significant difference between day and night. The WSOCMAE in polluted days was 1.96 m2/g and in the non-polluted day was 1.86 m2/g. In general, the absorbance capacity of WSOC in the polluted days was greater than that in the non-polluted days.
Study on urban domestic waste recycling process and trash can automatic subdivision standard
Authors: Peng Huaming , Zhou Junxiang
Published: November 2019

Objective In order to propose a garbage classification standard suitable for automatic subdivision of intelligent classified trash cans, and to improve the garbage recycling process. Methods Based on the status of urban domestic waste recycling process, process analysis and comparison method was used to analyze the related problems. According to the composition and nature of urban domestic garbage, the automatic subdivision standard suitable for intelligent classified trash cans was proposed. Result It is concluded that the traditional process has the problems of centralized treatment and vague positioning of each subject. Therefore, the keys should focus on the front-end classification to removal centralization, distinguish the positioning of each subject clearly and use technology to drive the classification. From these, the paper analyzes the composition and nature of recyclable garbage and harmful garbage to propose the automatic subdivision standard. Conclusion Only by making full use of people’s subjective initiative, using intelligent classified trash cans as carriers to subdivide automatically, can improve the garbage recycling process. This has important practical value and significance for solving the problem of urban diseases in China.
Destruction Mechanism and Prevention Technique of the Tunnel of Gushing-Water Roof in Xinyi Coal Mine
Authors: Feng Tantan , Zhu Shaohui , Hao Dazhen , Zhu Xinming
Published: November 2019

In view of the deformation and failure of the tunnel of gushing-water roof in Xinyu Coal Mine, this paper analyzes the characteristics and mechanism of tunnel deformation and failure by the combing laboratory experiments, theoretical analysis, and on-site industrial tests. The results show that: 1) the deformation of the gushing-water roof is significant with the maximum deformation value of 700 mm, and the bolt cable and the I-beam bracket are seriously damaged; 2) the failure of 1505 mudstone tunnel roof is considered to be the result of its low strength and easy argillization when it is exposed to water, lack of waterproof measures, unreasonable support methods, etc.; 3) this paper proposes measures such as full anchor cable support, waterproof anchoring agent, and drainage holes, and clarifies their control mechanisms. The field practice shows that the deformation of the ventilation tunnel tends to be stable after about 30 days of the implementation of the plan, thus providing reference for the surrounding rock control in similar tunnels.
Stress Observation and Strata Behavior in Fully-mechanized Coal Face of Shallow Coal Seam
Authors: Bao Zhao Ren , Ming Zheng Zhong
Published: November 2019

In order to solve the problem of the strong ore pressure in the mining process of a shallow buried coal seam working face, the ore pressure law of a shallow buried coal seam working face was observed. According to the observation results of ore pressure, the law and characteristics of ore pressure on the working face of shallow buried coal seam are analyzed, the basic law and parameters of roof movement and the roof plate falling situation on the end face on the working face are obtained, and the rationality of the support is studied.
Numerical Research of Movement Characteristic and Deposition Ratio on Cylinder Wall of Secondary Water Droplet between Penultimate Stage and Last Stage
Authors: Yan Chuan-wu , Wang Bo , Chen Jian
Published: November 2019

Secondary water droplet between the penultimate and last stage of a 300 MW steam turbine was researched by CFD on the basis of a two-phase flow mathematical model for steam and water droplet, and the Lagrangian methed was adopted to solve the discrete transport equation of water droplet. It indicated that secondary water droplet shows tendency to slop up to and get deposited on cylinder wall. The water deposition ratio on cylinder wall will be greater as the water droplets size increases or the blade height where the water droplets begin to move rises. Local deposition ratio increases as the blade height heightens according to the water deposition on cylinder wall behind penultimate stage and distribution of the secondary water droplet and steam moisture.
A Summary of Study on Slope Stability under the Coupling of Vibration and Rainfall
Authors: Chen Wenzhao , Fan Jiaqing , Wei Xiaoqing , Yang Kai , Yao Xiangrong
Published: November 2019

Systematically discussed the significance of the study on the influence of the coupling of vibration and rainfall on the stability of slope. The mechanism of slope hazards under the coupling action of vibration and rainfall was pointed out. The research status of the effects of vibration and rainfall coupling on slope stability is reviewed from three aspects: basic theory, analytical calculation method and application in slope engineering. Based on the analysis of the status quo of these studies, this paper proposes the problems and shortcomings in the study of the influence of the coupling of vibration and rainfall on the stability of slope.
Experimental Investigation on the Effect of Vertical Greening Facade on the Indoor Thermal Environment: A Case Study of Dujiangyan City, Sichuan Province
Authors: Peng Ying , Huang Zhu , Yang Yanqing , Wang Peng , Hou Chaoping
Published: November 2019

The vertical greening system is more and more widely used in architectural design and it is one of the sustainable development trends of new buildings. The green vertical façade can alleviate the urban heat island effect and improve the indoor thermal environment. To study the effect of vertical greening on indoor temperature and humidity and wall surface temperature, this study carried out a comparative experiment between two rooms that have completely identical structures and functions with or without vertical greening in Dujiangyan. According to the research, when vertical greening is adopted, the room temperature is reduced by 2.2°C on average and the surface temperature of the exterior walls is lowered by 13.9°C. Vertical greening can effectively reduce the temperature of the interior and exterior surfaces of the wall, improve the indoor thermal environment and better achieve building energy efficiency.
Introduction performance of four excellent and new citrus varieties in Jintang, Sichuan
Authors: Wang Tie , Zhang Junlin , Xiong Bo , Qiu Xia , Wang Jun , Sun Guochao , Wang Zhihui
Published: November 2019

In order to further enrich the structure of citrus varieties in the Jintang area of Sichuan, and to solve the problems of old and single varieties and relatively concentrated listing periods. In this experiment, four excellent and new citrus varieties, ‘Kanpei’, ‘Niahinoka’, ‘Or’ and ‘Qingfeng’ is introduced, and the local cultivar ‘Shiranui’ is used as a control. The traits and fruit quality indicators are investigated, measured and analyzed. The results show: The ‘Kanpei’ and ‘Or’ trees are strong, the ‘Niahinoka’, ‘Qingfeng’ and ‘Shiranui’ are medium, ‘Or’ has the highest ratio of sugar to acid, ‘Niahinoka’ has the highest vitamin C and soluble solids. Compared with the control, the ratio of sugar to acid and the per mu yield in the ‘Niahinoka’ is 27.78% and 13.62% higher than ‘Shiranui’, ‘Qingfeng’ performance is poor. According to a comprehensive analysis, ‘Kanpei’, ‘Niahinoka’ and ‘Or’ are suitable for introduction, and ‘Qingfeng’ is not suitable for introduction.
Experimental Study on the Strength of Fly Ash Geopolymer with Alkali Activator Modulus
Authors: Cui Jingyu , Zhang Wuyu , Ji Gang-ao , Tong Guoqing , Xie Banglong
Published: November 2019

The variation of strength of fly ash geopolymer under different alkali activator modulus is studied. In this paper, three samples with modulus of alkali initiator 1.0, 2.0, 3.0 were prepared by laboratory test, and the unconfined compressive strength, SEM scanning and XRD analysis were conducted. Results show that the strength of the fly ash geopolymer negative correlation with alkali excitation agent module, with higher modulus alkali excitation agent, the strength of the polymer decreased obviously. From the micro perspective, the lower modulus of the sample of the microstructure appear more dense, gelling material produce more obvious at the same time. From the part of XRD, different modulus of the sample composition are same basically.
Study on Soil Microbial Community Structure of River Wetland in Tumen River Basin
Authors: Hong Fengyang , Chang Yuge , Fan Zhiyu , Zhu Weihong , Jin Mingji
Published: November 2019

This study explored the relationship between soil microbial community structure and soil environmental factors in river wetlands of Tumen River Basin by analyzing the soil microbial community structure and combining soil environmental factors.As a result, there were significant differences in microbial community diversity among river wetlands in the Tumen River Basin. Proteobacteria and Actinobacteria were the abundant dominant phylum of microbial, moreover,Actinobacteria and Alphaproteobacteria were the dominant class of microbial.Soil environmental factors such as soil organic matter, soil total nitrogen and soil total potassium are the main factors affecting the change of microbial community structure in river wetlands of Tumen River Basin.
Analysis of ground temperature variation in differential settlement of China-Russia crude oil pipeline: field monitoring and numerical simulation
Authors: Bi Guiquan , Song Zhengmin , Mu Yanhu , Li Guoyu
Published: November 2019

In vast areas of rich frozen soil, the intense heat exchange between the hot oil pipeline and surrounding soil results in the continuous melting of permafrost under the pipeline and the continuous sinking of the pipeline. Moreover, the settlement rate and depth of the pipeline are also different due to the influence of ice content and the thickness of rich frozen soil layer. Therefore, in this paper, based on the field measured data, by adopting the method of numerical simulation, the temperature rise process of the soil around the pipeline under the condition of different subsidence rate and different thickness of rich frozen soil layer is studied. The results show that with the increase of the thickness of the frozen soil layer, the degradation depth of the upper limit of the artificial frozen soil in the lower part of the pipeline increases gradually. Under the same thickness of the frozen soil layer, the influence of the settlement rate of the pipeline on the upper limit of the artificial frozen soil in the lower part of the pipeline mainly concentrates on the initial operation stage of the pipeline; with the increase of the thickness of rich frozen soil layer, the upper limit difference of artificial frozen soil under different settlement rates of pipelines at the same time increases gradually. Of different sedimentation rate and the rich soil layer under the condition of ice -6 m depth of geothermal heating process monitoring, the geothermal heating process can be divided into three stages: melting stage (I), rapid heating stage (II), slow heating stage(III). With the increase of the settling depth, the duration of the phase I and II is significantly reduced, the heating rate is significantly promoted, the duration of phase III is increased significantly and the heating rate is gradually reduced.
Evaluation of Negative Effect on Groundwater Environment Caused by Weathered Granite Tunnel Construction with Mining Method Based on GIS
Authors: Zhu Liubing , Chen Lingqiang , Pan Yiheng , Hu Wenyi , Li Ping , Feng Yong
Published: November 2019

In order to figure out the negative effect on groundwater environment caused by weathered granite tunnel construction with mining method, the influence factors were considered comprehensively to establish the evaluation index system and classification standard for negative effect on groundwater environment. The fuzzy comprehensive evaluation and analytic hierarchy process were used to quantify the evaluation indexes and determine the weight of indexes. The system to evaluate the negative effect caused by tunnel construction with mining method on groundwater environment was developed based on GIS and was applied to a tunnel section of Guangzhou Metro line 21. The research results show that: the permeability of rock, the grouting effect and the waterproof and drainage are the major influence factors. The negative effects of DK25+984.0 ∼ DK26+000.0 and DK26+000.0 ∼ DK26+434.0 mileage sections are strong and medium, respectively, which coincided with the actual situation. This research can provide a scientific approach to evaluate the negative effect caused by tunnel construction with mining method on groundwater environment.
A Comparative Study on the Treatment of Eutrophic Water by Aeration and Algae Fish
Authors: Yang Xi , Huang Haiyu , Huang Longxiang , Li Dejun , Wang Suyu , He Minxuan , Li Di , Xu Kun
Published: November 2019

With the introduction of relevant national policies, large numbers of environmental projects were carried out for remediation and quality improved, but in the main indicators of long-term quality control and operational cost are still a big issue. In this study, the effects of water quality control by aeration and algae-eating fish species, Mugil cephalus and Salmoniformes, were applied to the test in a landscape pond. The results showed that both ways had similar effect on the pollutants, CODCR, total nitrogen and total phosphorus decreased by about 56%, 59% and 35% respectively, and the water transparency also improved significantly. However, before the application of ecological management in real project, detail environmental conditions and pollution load analysis should be carried out for ensuring safety and efficiency.
Design of a continuous fixed film photocatalytic reactor based on Bi2WO6/ZnFe2O4 magnetic photocatalyst and application in tetracycline degradation
Authors: Li Chenyang , Lv Chen , Wang Yu , Zhong Shuang
Published: November 2019

A kind of continuous magnetic fixed-film reactor was designed and applied in tetracycline degradation based on the Bi2WO6/ZnFe2O4 magnetic photocatalyst. The effects of light intensity, initial TC concentration and HRT on the photocatalytic effect were investigated. At the pollutant concentration of 51.58 mg/L, light intensity of 3.20×105 lux and HRT of 94 min, the TC removal rate in the reactor was enhanced to above 90% and maximized to 94.05%. From the different pollutant concentrations, the specific outflow criterion could be achieved by regulating the HRT within a certain range, so as to maximize the reactor use efficiency. Compared with conventional fixed-film reactors, the new reactor had larger reaction contact area and avoided the defect of catalyst shedding.
Simulation Study of Tc Composite Bullet Penetrating Ceramic Composite Target
Authors: Li Shiji , Rong Yinlong
Published: November 2019

In this paper, using ls-dyna numerical simulation software to simulate the penetration process of ceramic composite target. Studying respectively the penetration ability of TC/steel composite bullet and conventional steel bullet, TC/tungsten alloy composite bullet and conventional tungsten alloy bullet. Finally, finding the different results of the four kinds of kinetic energy projectile penetrating ceramic composite target under the same size and speed conditions. The results show that the penetration ability of TC composite bullet with high-speed is better than that of the conventional metallic bullet.
Optimization of insoluble dietary fiber preparation technology from Rosa roxburghii Tratt pomace by enzyme method
Authors: Zhou Xiaoli , Zhu Guangxu , Lu Ying , Du Bin , Lin Dong , Ran Zhiyong
Published: November 2019

In order to avoid Rosa roxburghii Tratt residue wasted. The Rosa roxburghii Tratt insoluble dietary fiber was extracted by enzyme method, and the temperature, time, pH and enzyme amount were analyzed by amylase, glucoamylase and protease through single factor and orthogonal experiment. The results showed that the best process of enzymatic extraction of IDF from Rosa roxburghii Tratt residue was as follows: the enzymatic hydrolysis 40 °C and 70 min, pH 6.0, and the amount of amylase 10 mL; the enzymatic hydrolysis 40 °C and 30 min, pH 6.0, and the amount of protease 4 mL; the enzymatic hydrolysis 50 °C and 50 min, pH 5.0, and the amount of glucoamylase 8 mL; The average extraction rate of the IDF of Rosa roxburghii Tratt residue was 92.41±1.99%, it was dark yellow and could be used as a food ingredient. The experimental method is simple and convenient. It provides a new way for the comprehensive utilization of Rosa roxburghii Tratt, and lays a foundation for the development and research of Rosa roxburghii Tratt.
Magnolol–Coumarin–Phenylbutyric acid Conjugates: An Anticancer Prodrug via multiple targets
Authors: Tao Ali , Song Zurong , Feng Xuehua , Hu Bo , Lei Xuan
Published: November 2019

We present here, the design and synthesis of a phenylbutyric acid-magnolol-coumarin conjugates (5). Compound 5 is a multifunctional molecule composed of magnolol, coumarin, phenylbutyric acid as model active drugs via ester. Upon entering tumor cells, ester bond cleavage occurs as well as active drug magnolol, coumarin and phenylbutyric acid release to attack cancer cells. In vitro anti-proliferation experiments showed that the inhibitory activity of compound 5 against HepG2, MCF-7, A431 and A549 cells was significantly higher than that of its single parent compound. Moreover, compound 5 had a long-term effect. Due to fluorescence of compound 5, it can serve as a fluorescence imaging agent and its uptake can be monitored. Compound 5 may provide a reference for the design of new derivatives of magnolol.
Hierarchical Division Method of Road Network for Critical Points Identification
Authors: Yu Qifeng , You Kesi , Chu Yiming
Published: November 2019

In order to increase the rationality and efficiency of critical points identification of road network, and improve safety monitoring level of the road network, the hierarchy division method of the road network was studied. Based on the analysis of influence factors of road hierarchical level, this paper presented four evaluation indexes: road safety, functional, traffic flow characteristics and road infrastructure features. Roads were evaluated and sorted using the utility function. The paper achieved a hierarchical division of road network using the sample clustering analysis method, showed the basic process of the hierarchical division method through an example, and provided the basis for the identification of the critical points of the road network in future.