bluuebunny/crossref_metadata_2025_split huggingface dataset:
Research on Optimal Design of Foundation Pit Anchor Support based on Improved Particle Swarm Optimization
Authors: Yang Zhuo , Dong Xiaobin , Xie Ding , Cao Jiaqiang 
Published: August 2019

Abstract
The engineering technology of deep foundation pit support is complex and comprehensive, and it is necessary to consider the relationship between safety and engineering cost, and the optimal design of foundation pit support is especially important. Anchor support is a common support way for deep foundation pit support, in allusion to the shortcomings of particle swarm optimization; this paper adopts genetic algorithm, step length acceleration method and improved particle swarm optimization to carry out optimal design for foundation pit anchor support. The optimization results show that the combination with genetic algorithm improves the diversity of particle populations, the particle swarm optimization combined with the step length acceleration method has faster convergence performance, and the mathematical model of anchor supporting structure design is established. Through the case study of the foundation pit support of the super-high-rise building with frame shear wall structure, it was found that the engineering cost of the improved anchor support scheme after the improved particle swarm optimization is lower. The research in this paper provides a mathematical model for foundation anchor support.
Coalbed Gas and Shale Gas Resource Prospect of Heyang-Hancheng Area
Authors: Liang Min , Liang Hui , Yuan Jinhui , Fan Yuhai 
Published: August 2019

Abstract
As an important coal production area, Heyang-Hancheng has already reached coalbed gas exploration stage. However past study had been focused on coal resources survey; systematic oil gas resources assessment had never been conducted. Based on sediment environment research, this paper using field coal survey data combined with source rock organic geochemistry analysis, argillaceous shale and coalbed aero field absorption and resolve tests, isothermy absorption tests, coalbed gas well logging and gas well logging methods etc. to assess the coalbed gas and shale gas exploration prospects. Resource rock of this area is widely distributed and rich in organic matters, has plenty of type II kerogen, and its organic maturity reaches post mature dry gas stage; thus, has sound hydrocarbon production potential. Both coalbed gas well-logging and isothermy absorption indicated gas content has reached resource evaluation criteria; both shale gas in-situ desorption and gas well-logging show existence of gas, and the natural gas is mainly methane (CH4) with heavy hydrocarbon component.Introduction. Locates at the intersection of Hancheng and Chenghe Mining Area in Weibei Coalfield in Hancheng City and Heyang County, the study area has a width of 20.14km from east to west, length of 22.58km from north to south, with an irregular shape and has a total area of 300km2. The area, rich in coal resources, is an important coal resource producing area with widely distributed coal-bearing construction and good continuity. The loess covers a large part of area, and the bedrock is intermittently exposed along the valley. The structural position is in the turning position of the anti-“S” type head in the Weibei coalfield, which is not conform to the monoclinic structure of the NW or NNW, and the dip angle of the stratum is 3°∼7°. The faults are all normal faults, with strike of NE or NEE, usually less than 10 km, the section dips NW, and the fault scale is generally tens of meters to more than 100 meters. The northern fault is mostly southward, and the southern fault is mostly northward, which together forms the NEE direction asymmetric composite garben structure.
Study on Influencing Factors of Heavy Oil Waterflooding Development
Authors: Tang Guangliang , Xue Liangyu , Zhou Tao , He Shan , Song Mingyao , Li You 
Published: August 2019

Abstract
In this paper, the influence factors of development effect of heavy oil reservoir by water flooding are analyzed and studied by numerical simulation technology. The results show that: (1)with the increase of crude oil viscosity, reservoir recovery decreases gradually and development effect becomes worse; (2) for heavy oil reservoirs with different viscosities, recovery increases at first and then decreases slowly with the increase of permeability; (3)water injection development is carried out under different formation pressure maintaining horizontal conditions, the results show that the maximum development efficiency of reservoir recovery is achieved under saturated pressure conditions. The results show that there are optimal injection velocities for different permeability reservoirs, such as 0.06 PV/a for 100 md reservoir, 0.10 PV/a for 500 md reservoir and 0.04 PV/a for 1000 md reservoir.
Definition of Pressure Relief Range and Effect Analysis of Regional Measures in Long-distance Mining of Protective Seam
Authors: Li Siqian 
Published: August 2019

Abstract
Based on the engineering background of the protection layer mining of the long distance and near horizontal coal seam group in Zhujixi Coal Mine, by means of theoretical analysis, numerical simulation and field investigation, the scope of pressure relief protection of the protected layer after the protection layer mining is studied and determined, and the effect of regional measures of surface drilling and underground perforation extraction measures is evaluated. The results show that the pressure relief angles in strike and dip directions are 63.7° and 80.8° respectively. The maximum residual gas content is 5.28m3/t and the gas extraction rate is 81.4%. The pressure relief protection effect is remarkable, effectively eliminating the outburst risk of the protected layer.
Research on Safety Assessment Method and System of a Heightened Concrete Face Rockfill Dam in Zhejiang Province
Authors: Fang Chunhui , Wang Xue , Wu Liqiang 
Published: August 2019

Abstract
In view of many special analysis and long working period of the dam safety appraisal of water conservancy system, taking a heightened concrete face rockfill dam in Zhejiang Province as an example, starting from the analysis of the main impervious structure system affecting engineering safety, comprehensively using safety monitoring, inspection and detection methods, a relatively convenient and efficient dam safety assessment method and system has been established. The evaluation results show that the concrete face rockfill dam can play functional benefits according to design requirements, and the safety condition is good. The evaluation conclusion is of great significance for the reservoir operation management unit to quickly grasp the dam safety traits. The evaluation method and system have reference significance for the continuous development of the dam safety appraisal work in new era.
Concrete Construction of Flood Discharge and Sand-washing Sluice Bottom Slab of Angu Hydropower Station
Authors: Chen Jie , Xu Xiaoyi 
Published: August 2019

Abstract
Based on the analysis of the concrete construction of the bottom slab of flood-discharge and sand-wash sluice in Angu Hydropower Station, this paper expounds the construction characteristics and difficulties, construction procedures, concrete construction of concrete stilling pool in conventional position, concrete construction of overflow and retaining wall, concrete construction methods and measures in special position, etc. Especially, the concrete stratified partition of the bottom slab of flood-discharge and sand-wash sluice and the typical partition of stilling pool have their unique features. The overflow surface concrete adopts self-designed, processed and manufactured stereotyped drawing dies. And after concreting, we use bamboo springboards and protective measures to keep warm in time. The construction scheme is reasonable in design, meets the requirements of construction progress, has no safety accidents, and achieves good construction effect. It has certain reference value for the concrete construction of bottom slab of flood discharge and sand washing sluice of similar projects.
Organic Modification of Inorganic Ions (Montmorillonite, Hydrotalcite) and its Application in Polylactic Acid-based Nanocomposites
Authors: He Shimao 
Published: August 2019

Abstract
In order to understand the organic modification of inorganic ions (montmorillonite, hydrotalcite) and its application in polylactic acid-based nanocomposites, and to explore the hot issues in this field, the mechanical properties, thermal stability, crystallization properties, ultraviolet shielding properties, rheological properties, flame retardancy and degradation properties of inorganic ions added to polylactic acid after organic modification were expounded. It will provide the development direction for the organic modification of inorganic ions and their application in polymers in the future.
Soil Quality Analysis in Newly Increased Cultivated Land
Authors: Liu Zhe , Wang Huanyuan 
Published: August 2019

Abstract
In order to explore soil physical-chemical properties and water quality in Bailiang town, Heyang county of Shaanxi Province, the soil physical-chemical properties of newly increased cultivated land, the water heavy metal contents of chromium, copper, zinc, arsenic, selenium, cadmium, mercury and lead of Yellow River water and groundwater in the project area were measured. The results showed that the pH value, total salt content and heavy metal content of the Yellow River and groundwater were all in line with the farmland irrigation water quality Standard, which could guarantee irrigation use. The type of soil in the 0∼30 cm was sandy loam, the bulk density of 0∼30 cm soil layer was 1.52 g cm−3, and the saturated hydraulic conductivity was 229.41 cm d−1, which could meet the needs of planting soil quality requirements, but sandy loam soil with large saturated water conductivity was easy to leak water and fertilizer. Meanwhile, the content of exchangeable calcium of 0∼30 cm soil layer was in a very rich state(38.6∼90.1 cmol kg -1), and the content of available potassium (36∼128 mg kg−1)and effective boron(0.56∼0.89 mg kg−1)were moderate, the content of organic matter(1.06∼2.65 g kg−1), total nitrogen(0.18∼0.33 g kg−1), available phosphorus(3.2∼8.4 mg kg−1) and available silicon content(41.0∼68.6 mg kg−1)were in a state of lack. These results indicate that the organic fertilizer, green manure, straw and small amounts of fertilizer could be used to increase the content of organic matter, and other nutrient elements in the cultivated layer. It was recommended to design the loess tillage layer and plow pan layer, which played the role of water retention and fertilizer retention, and was suitable for the growth of aquatic crops.
Study of Unequal Speed Leveling Of Pulverized Coal Piping in Cold State
Authors: Zhang Tianyu , Wu Feng , Zhao Xi , Zhao Zhenning 
Published: August 2019

Abstract
Thee equality of flow of coal powder and wind in each pulverized coal piping makes great differences on the heat flux uniformity in combustion chamber. Thus, a common way to ensure the equality is to change the opening degree of the adjusting holes on the piping to get equivalent wind flow in cold state. However, the operating condition of the piping is in hot state with coal powder, which changes the resistance characterizes in each piping. Present paper casts light on the calculation method of unequal speed leveling in cold state, in order to get equivalent wind speed in hot state with powder.
The Applicability of Soil Density Gauge in The Detection of Non-Cohesive Soil
Authors: Li Zhen , Wang Zhengjun , Xiong Aoyun 
Published: August 2019

Abstract
With the needs of engineering construction, non-cohesive soil has been widely used in important fields such as dams and roadbed filling. The strength and compressibility of non-cohesive soil mainly depend on the compactness.However, it has so far been difficult to find a method for determining the compactness of non-cohesive soil quickly, accurately and safely.In order to cope with this problem, this paper focuses on the working principle and operation process of the SDG200 soil densitometer.At the same time, on the basis of summarizing the previous research, it is pointed out that the difference between the operation of clay soil and non-cohesive soil density is tested by SDG soil densitometer, and the parameter setting problem in the non-cohesive soil compactness test is solved.Therefore, it can be predicted that the SDG soil densitometer will have a good application prospect in the detection of non-cohesive soil compactness.
Ecological Development and Design of River Beach Land in Heyang Section of The West Bank of The Yellow River
Authors: Lu Nan , Wei Yang , Wang Qilong , Li Gang 
Published: August 2019

Abstract
In order to optimize the allocation of soil and water resources and improve the efficiency of agricultural production and the efficiency of agricultural production, with restoring the ecological function of the Heyang section of the west bank of the Yellow River, parts of the river beach land were treated as the high-quality farmland. By the implementation of the main and auxiliary projects for the organic reconfiguration of soil along the yellow beach in Heyang. The flood land was governed as the wetland agricultural area including the paddy field system, drainage system and the road system. Strengthened the policy of making up balance of the cultivated land and the thesis of general secretary Xi. Simultaneously, the goal of developing the arable land resources and protecting the ecological environment were achieved.
Research on The Exploration Technology and Method of Natural Gas Hydrate in China
Authors: Zhang Baojiang 
Published: August 2019

Abstract
new clean energy is essential for the rapid development of society. The appearance of natural gas, water and materials can timely alleviate the energy shortage in China. Natural gas water and substance is a kind of clean energy formed by hydrocarbon gas molecules such as water and methane under high pressure and ground temperature. At present, the main methods of land gas hydrate exploration are: high-precision seismic exploration technology, geophysical logging technology, geochemical exploration technology, remote sensing detection technology, audio magnetotelemental technology, and ultrasonic ground penetrating radar technology. In this paper, the basic exploration characteristics of different exploration technologies are introduced, which provides technical support for the rapid detection of terrestrial gas hydrate.
Physical and Chemical Properties and Nutrient Composition of Pisha Sandstone Under Different Temperature and Ph Value
Authors: Wang Luyao , Shu Xiaoxiao , Wang Huanyuan 
Published: August 2019

Abstract
The Pisha sandstone is widely distributed and rich in mineral elements. It has caused widespread concern about how to turn the rich mineral elements contained in Pisha sandstone into an activation state that can be absorbed and utilized by plants. Meanwhile, it will be the focus of this paper that the effect of physical and chemical properties and nutrients of the Pisha sandstone under the various activation conditions, such as pH, temperature and salt solution. We take pH and temperature as examples, the changes of physical and chemical properties, the main nutrients and nutritional level evaluation of the treated Pisha sandstone were studied. The results show that the conductivity of the Pisha sandstone can be improved under acidic or alkaline conditions. The temperature is one of the main factors affecting the content of available phosphorus, organic matter and available potassium of the Pisha sandstone, while the total nitrogen content is little affected by pH and temperature. And the nutrient grade of the Pisha sandstone increases from very low to low Only at 50°C.
Change of Adsorptive Bound Water of Soft Soil in Hangzhou under Typical Loading Conditions
Authors: Zheng Qingqing 
Published: August 2019

Abstract
Adsorptive bound water can reflect the physical properties of soil and affect its mechanical behaviour. Based on the important function of adsorbed water, the change of adsorbed water under three types of load is studied. The undisturbed samples nearby subway in Hangzhou is selected as criterion. Via the volumetric flask method, the content of the adsorbed water and the specific surface area are measured. Compared with the results of undisturbed specimen, this paper evaluated the effect of the impact, vibration and remolded and vibration. The results show that after loading the adsorption water content decreases. Among three types of load, the remolded vibration made the most significant change.
Numerical Simulation and Analysis of Thermal Stress on Restressed Assembly Steel Struts System in Foundation Excavation
Authors: Hu Qi , Zhang Kai , Song Junguo , Fang Huajian , Xie Jiawen , He pinpin , Ran Long 
Published: August 2019

Abstract
When using horizontal internal bracing system in large span deep foundation pit, the influence of temperature effect on bracing system must be considered. Based on the long-term thermal stress monitoring of a project in the west of Hangzhou, this paper studied the influence of Angle brace temperature effect on the foundation pit enclosure structure after excavation to the bottom by using three-dimensional finite element model. When the strut temperature rises, the strut axial force increases. The longer the length is, the higher the axial force rises. The horizontal displacement of the surrounding wall and soil will be in the external direction of the pit, which is conducive to the stability of the surrounding system. The second layer struts are more affected by the temperature effect than the first layer struts, and the combined action of the two struts makes the surrounding wall produce greater displacement. The pouring of the bottom plate makes the strut subject to the temperature effect to generate greater axial force, the second layer struts change more violently, and at the same time reduces the displacement and deformation of the retaining structure. When the temperature drops, the strut axial force decreases and the horizontal displacement of the retaining structure to the pit increases, which is not conducive to the stability of the system. At this time, the reinforcement of the nearby soil body can be considered to reduce the deformation of the soil body and the retaining wall.
Evaluation and Prediction of Water Resources Utilization Structure Based on Projection Pursuit Method
Authors: Wu Jie 
Published: August 2019

Abstract
All Based on the statistics of water use in the past five years, this paper uses the projection pursuit method to evaluate the rational use of water resources in various provinces and cities in China, and establishes corresponding prediction models for the completion of red line indicators. Perform preliminary statistical analysis on the data, select relevant indicators to establish a projection pursuit evaluation model, and use the genetic algorithm to solve the problem, display the projection values of each province and city on the map, and point out the existing problems. Four of the red line indicators were exponentially fitted and predicted. The final water quality compliance rate did not reach the red line target value of 2030, and the deviation from the target was 13.68%.
Research on Watershed Extraction Method Based on GIS
Authors: Li Yanan , Lei Na , Xiong Yufei 
Published: August 2019

Abstract
The Digital Elevation Model (DEM) mainly describes the ground elevation, which contains rich hydrological information and is one of the main data sources for current watershed analysis. This paper takes Fuxian County of Shaanxi Province as the research area, and uses the ASTER GDEM data of 30m resolution, based on the Hydrology module of ArcGIS10.3 platform, after the filling of the earth, the calculation of the flow direction, the calculation of the cumulant accumulation, the determination of the convergence threshold, the extraction of the river network, etc. The method of basin watershed extraction is studied and the characteristics of the basin are comprehensively analysed. The results show that when the convergence threshold is 11000, the extracted river network is closest to the actual river network, and the derivative relationship can be used to determine that the extracted river network reflects the threshold of the real water system
Landscape pattern analysis of urban green space based on the new green space classification standard Take Danzhou City, Hainan Province as an example
Authors: Liao Jiaqi 
Published: August 2019

Abstract
This study takes the urban center of Nada, Danzhou City, and Hainan Province as the research object and uses GIS technology and the principle of landscape ecology to analyze the urban green space and landscape pattern of public green space of the central city. The results show that the land scape structure of the central city is unreasonable, the public green space is seriously lacking and the distribution is not balanced. The proportion of regional green space is high and the available space is large; the landscape diversity index is 1ow and the degree of fragmentation is high.
Discussion on Process Design of Zero Discharge of Wastewater in a Power Plant in Northwest China
Authors: Xue Fangming , Chen Feng , Su Jingcheng , Sun Yiqing , Liu Xiuru 
Published: August 2019

Abstract
This paper analyzes the water balance test report of a power plant in Northwest China, the relevant operation records and the statistical wastewater volume of various types of renovation projects. From the technical and economic point of view, the two-step process of optimizing utilization and deep treatment is proposed, and two design techniques are given. Discuss its options.
Preparation of Novel MOF with Multipolar Pore and Adsorption Properties of VOCs
Authors: Chen Dingsheng , Li Yiting , Zhong Xiamei , Zeng Huanmu , Chen Zhihang , Tang Zijun , Cen Chaoping 
Published: August 2019

Abstract
MOF-5 crystals were prepared by solvothermal synthesis, and characterized by electron microscopy (SEM), X-ray powder diffraction (XRD), and specific surface area (BET). The adsorption of formaldehyde, acetone, glycerol and toluene were studied. The effects of reaction solvent ratio, adsorption time and synthesis temperature on adsorption were investigated. The results show that the reaction solvent ratio is 2.6, the crystal particles have good integrity, the cracking phenomenon and aggregation phenomenon are less, the size is more uniform, highly crystalline, the specific surface area and pore volume are larger, and the pore size distribution is more concentrated. The adsorption time is 48 h, the synthesis temperature is 95°C. Under high temperature conditions, MOF-5 has a high-dimensional skeleton crystal structure with higher specific surface area and pore volume. MOF-5 has the best adsorption effect on toluene.
Design of hull ultra high-pressure water ejector derusting system
Authors: Wang Zhi , Fang Suyi , Zhu Faxin , Wang Weijun , Li Yule , Chen Tian , Wang Jiahon 
Published: August 2019

Abstract
In this text, the system takes the hull of the 82000 DWT bulk carrier as the research object, this system analyses the common methods and existing shortcomings or problems of the existing hull rust removal methods. In view of the shortcomings or problems of these methods, the design requirements of the hull rust removal system are set out. Based on AutoCAD design platform, a high-pressure water jet rust removal system is designed, its working principle and main components are introduced, and the main parts of the system are selected for calculation.