bluuebunny/crossref_metadata_2025 huggingface dataset:
Investigation and Evaluation Analysis on the Effect of Landscape Improvement in Zhuang Traditional Villages
Authors: Cui Muyang , Wang Xiaodong
Published: March 2021

Masa Village is located in Maguan County on the Sino-Vietnamese border. It is one of the traditional villages with Zhuang characteristics. This research takes the final construction effect of the “Masa Ten Scenery” in Masa Village as the specific research object, and uses SPSS software to carry out statistical analysis of variance through a combination of field investigation and big data investigation, and then obtains a comprehensive and objective evaluation result. To facilitate the summary and improvement of methods and measures, to better improve the level of renovation and design of ethnic minority villages, and to better guide design practices.
Research on the Regional Environmental Protection and Imbalance of Economic Development in Qinghai Province
Authors: Qing Xin , Li Juanyi , Zhao Falan
Published: March 2021

Due to differences in economic foundation, natural and geographical environment, and other factors, the regional economic development of Qinghai Province is unbalanced, and regional environmental protection is problematic. This paper uses the location entropy method and the coupling coordination model to evaluate the economic development and environmental protection of eight regions in Qinghai Province. Finally, combining the characteristics of economic development and natural environment in the main areas of Qinghai Province, corresponding countermeasures and suggestions are put forward.
Application of BIM energy conservation technology in conceptual design
Authors: Tang Haiyue , Yang Ruiyi
Published: March 2021

Energy is a necessity of social and economic development, and buildings account for one third of the world’s total energy consumption. To reduce the energy consumption of buildings is important in the energy conservation initiatives. In construction projects, energy-saving design can be implemented only when the construction diagrams are prepared, which leads to contradictions between the construction plan and the goal of saving energy. Therefore, it is necessary to emphasize energy conservation in the conceptual design of buildings. The BIM technology can provide a reliable basis for architects in energy conservation design. With BIM models introduced to energy-saving design, we can identify, convert and analyze the building data in the models to obtain architectural energy-saving analysis results more efficiently. With BIM technology, we can involve energy conservation in the conceptual design stage to provide a basis for energy conservation.
Applications of methane-based membrane biofilm reactor for oxidized pollutants removal from wastewater: a short review
Authors: Yang Jingjuan , Wang Yuhang , Chen Bo , Chen Yuchao , Zhang Xuehong
Published: March 2021

Methane-based membrane biofilm reactor (CH4-MBfR) is an emerging wastewater treatment technology based on gas-permeable membranes for oxidized pollutants (e.g., NO3
-) abatement. This paper reviews the operation principle of CH4-MBfR, the involved pathways in the aerobic/anaerobic methane oxidation coupled to denitrification (AMO/ANMO-D) process, as well as the recent key advances of CH4-MBfR for environmental applications.
Analysis of Bus Accessibility Based on GIS and Big Data of Crowd -- Taking Wansheng Economic Development Zone as an example
Authors: Xiao Hai , Liang Xu , Zheng Yuan , Xia Xinyi
Published: March 2021

Public transportation issues are increasingly becoming a key constraint to the sustainable development of urban economic and social development. Based on crowd big data and GIS spatial analysis methods, this article analyzes the accessibility of the public transportation in Wansheng Economic and Technological Development Zone (hereinafter referred to as the development zone). A comprehensive evaluation and analysis was conducted to study the matching relationship between population density and existing public transportation stations, and to propose the optimal suggestions. The results show that the overall public transportation accessibility in the development zone is average level, and the public transportation accessibility is better in the densest crowded areas, but in the east and southeast of the development zone, crowd activities are poorly matched with the public transportation network, and residents’ travel demands can’t get public transportation with timely responses.
Research on the method of responsibility division of transboundary water pollution
Authors: Yanqiong Ma , Manchun Liang , Qilin Zhao , Gang Xu , Mei Li , Xia Zhang , Chunyan Chen
Published: March 2021

With the rapid development of China’s economy and society, there has been a serious crisis in the field of water environment safety. Due to the mobility of water and the spatial distribution of water in the basin and other reasons, cross-border water pollution has become a major issue of general concern to the state and the whole society. In this paper, the scope of responsibility of pollutants is generated using the one-dimensional steady-state water quality dynamics based on the basic data of the target area, the corresponding basic data of water quality, water quantity, administrative scope and responsible person so on, so as to realize the comprehensive responsibility division of water quality of cross-border water bodies. The pollutant attenuation coefficient was used to calculate the pollution concentration of pollutants from the initial section of the upstream of the responsibility jurisdiction to the section of the river section at the end of the jurisdiction, which can avoid the calculation error caused by the concentration changes of the pollutants under the comprehensive effects of hydrology, hydraulics, chemistry, physics, geography, biochemistry, climate, location and meteorology in the process of transportation, and improve the accuracy of pollution liability definition of each administrative area.
Research on the Application of BIM in Environmental Art Design
Authors: Zhao Jingjing
Published: March 2021

The work of environmental art design involves multi-disciplinary fields. At the same time, we also need to complete multiple tasks such as information statistical processing, three-dimensional model construction, real-time scene simulation, and drawing construction drawings. Traditional two-dimensional design technology has been unable to meet the actual needs of environmental art design work. With the continuous development and maturity of BIM technology, it can provide a new structural system and information integration platform for environmental art design work. In this way, not only data information such as material properties and building structure can be highly integrated, but also the view frame can be accurately simulated and analyzed, and real-time scenes can be presented intuitively. In order to make the drawing of construction drawings more accurate and reasonable, BIM technology should be actively used to comprehensively improve the quality and level of environmental art design.
Research On the Change of Rainwater Quality in the Early Stage of River Discharge
Authors: Yanqiong Ma , Manchun Liang , Qilin Zhao , Chunyan Chen , Yuhan Cheng , Youzhi Huang , Gang Xu
Published: March 2021

The primary rainwater non-point source pollution is one of the main pollution reasons affecting river water quality. Based on the comprehensive analysis of the rainfall data, initial rainwater quality data and catchment area data, this paper obtains the variation rules and pollution characteristics of the initial rainwater quality at different catchment ranges of river outfall, and provides suggestions for the control of primary rainwater non-point source pollution of the target river outfalls. In the target River outlet of this study, the commercial area is the first to reach the peak of COD and ammonia nitrogen in the initial rainwater quality, and the living area is the highest in the initial rainwater COD and ammonia nitrogen concentration. Thus the control measures can be taken for the initial rainwater in the commercial area, and the key prevention and control measures can be taken for the higher concentration initial rainwater in the living area.
Evaluation of Suitability of Urban Human Settlement Environment Based on GIS -- Take Tianpeng Town Pengzhou City as an example
Authors: Xiao Hai , Bai Rong , Zheng Yuan , Xia Xinyi
Published: March 2021

The research objects of human settlement suitability evaluation are mostly cities or villages, and towns are rarely used for analysis and evaluation. This paper takes Tianpeng town of Pengzhou city as the research area, divides the human settlement environment suitability evaluation factors into three-factor layers, 18 index layers, combined with relevant standards and literature data. Analytic hierarchy process (AHP) is used to obtain the weight of each factor, and uses ArcGIS to calculate with buffer analysis, overlay analysis and other spatial analysis methods, and the evaluation results of human settlement in the study area are obtained. The results showed that unsuitable and particularly unsuitable areas accounted for 25.13% are mainly distributed in the southeast and southwest, and more suitable areas accounted for 74.87% are mainly distributed in the middle and east.
Improvement of Cultivation Quality of Future Environmental Protection Talents: from Scientific Literacy Aspects
Authors: Wang Chongyang , Zhang Ruyan , Zhang Shuai , Wang Lin
Published: March 2021

In recent years, as the development of environment science, new demands are needed for the cultivation of environmental protection talents. The improvement of scientific literacy has become an urgent need in the cultivation of undergraduate students major in environmental science and engineering. A good talent training model can promote the output of environmental protection talents and support the future environmental construction. In this paper, authors introduced the settings and practice of “Environmental Microbiology Practice” (EMP) in Miami College of Henan University. The teaching group of Miami College believed that EMP is the most suitable teaching link to help undergraduates understand the frontiers of the subject and improve scientific research thinking and did a series of reforms on the EMP course around (1) Current microbiological industry practice; (2) Frontier expansion of environmental microbiology; (3) Cultivation of scientific literacy. Combined with the students’ achievements and a questionnaire, the effectiveness of EMP has also been analyzed. By analyzing the practice of EMP in Miami College, this study provided an effective way for the improvement of scientific literacy and quality of undergraduate students. This cultivation idea and method is also of great significance for the cultivation of reserve talents of environmental protection who meet the needs of environmental scientific research and environmental protection in the new era.
Energy saving construction technology analysis of building engineering
Authors: Zhao Chunyang , Zhang Wanlai , Zhang Mingyue , Zhang Chunmei
Published: March 2021

The wide application of energy-saving technology in the construction of building engineering can effectively deal with the problem of energy consumption in the construction process. The application of various energy-saving construction technologies in construction engineering can reasonably reduce the construction cost of construction engineering, is conducive to improving the thermal insulation efficiency of construction engineering, and then improve the construction quality of construction engineering, and greatly improve the economic and social benefits of construction. In this paper, the energy-saving construction technology in building engineering is analyzed for reference.
On Strategies of Residential Indoor Healing Landscape Construction under the Era of Epidemic
Authors: Li Tongyu , Sun Cheng , Zhang Tong , Xue Binxia
Published: March 2021

The indoor healing landscape has a positive influence on people’s mind and physical health, indicated from the studies. This research aims to discuss the residents’ emotional problems during the home quarantine under the context of COVID-19 and put forward the strategies to construct a residential indoor healing landscape system based on disaster psychology, which is conducive to relieve residents’ emotional problems. Firstly, the general introduction includes the adverse effects on residents’ minds and physical health from major public health emergencies and the function of indoor healing landscape; secondly, the questionnaires are used to discover the residents’ emotional problems during the epidemic; finally, the strategies to construct the residential indoor healing landscapes are put forward to therefore regulate residents’ mind and physical health during home quarantine and working and living at home after the epidemic.
Practice and Thinking on Application of Ecological Grid in River Engineering
Authors: Zhang Chao
Published: March 2021

Ecological grid is a multi-hinged, hexagonal mesh structure woven by mechanical hinge, in which corrosion-resistant, wear-resistant and high-strength low-carbon hot-dip galvanized steel wires and aluminum-zinc alloy steel wires are coated with PVC or the above homogeneous steel wires treated with high corrosion resistance.

According to the application of ecological grid structure in river basin, this paper discusses the characteristics of ecological grid combined with the use case of ecological grid structure in river.
An Investigation on Human Activities in Shingen Bank Japan Centred on Spur Dike
Authors: Tianhang Xu , Nobuyuki Ishii
Published: March 2021

River space is one of the precious open spaces that human beings can contact with nature. Respecting, complying with and protecting nature is the essence of river landscape construction. In the process of natural river construction, the spur dike is an indispensable element for the stability of river banks, the formation of natural environment of ecological system and human activities, and its various functions are widely recognized. In this study, the spur dike in the Shingen Bank is taken as the center to investigate the forms of riverside activities of residents on the spot, to understand the impression of residents on the river, and on this basis, to investigate the spatial structure characteristics along the river and its relationship with human activities, with a view to providing some help for future urban river and riverside space reconditioning.
Application of Cast Steel Joint in large-Span Steel Structure
Authors: Chen Hui-lin
Published: March 2021

Cast steel node is a new type of structure joint developed with the application of large-span steel structure. The stress distribution is discussed of cast steel nodes under three-dimension load by FEM, in the space grid structure of a hangar. By the measurement, the stress on the surface of the cast steel node under the design load is obtained. Combined with the test on-the-spot and computation, the result proves FEM result.
Analysis of the impact of the COVID-19 Epidemic on the construction engineering EPC projects and claims
Authors: Sun Chunling , Xu Shangbin
Published: March 2021

Project construction contract disputes caused by the COVID-19 Epidemic are currently a hot issue of concern to both contracting parties. Based on the conclusion confirmed by the Legal Work Committee of the National People’s Congress that the inability to perform the contract due to the prevention and control of the COVID-19 Epidemic is force majeure, it analyzed and discussed the contractor’s claimable and non-claimable construction period and expenses due to the COVID-19 Epidemic.
Study on geometric optimization for new type of steel mortise and tenon joint based on performance
Authors: Chen Shuohui , Teng Xuan , Sang Xiuxing , Ye Birun , Liang Zongmin
Published: March 2021

Mortise and tenon joint is a common connection way of ancient Chinese timber structure. On this basis, in order to explore for a new type of mortise and tenon joint suitable for steel structure, the finite element model of a new type of steel mortise and tenon joint was established to simulate the whole behavior of it under tensile force and bending moment by using ABAQUS software. In this way, the effects of tenon number, tenon height and tenon width on the maximum local Mises stress, area of plastic stress region, tensile and flexural properties were discussed. The results show that the maximum local Mises stress, area of plastic stress region, tensile and flexural properties of the new steel mortise and tenon joint are significantly affected by the tenon number and height, while the tenon width has little effect on these properties. When the tenon number is 4, the tenon height is 15mm, and the tenon width is 5mm, the new steel mortise and tenon joint has the best mechanical performance, and the steel consumption is relatively lower.
Construction Monitoring on Steel Truss Bridge’s Maintenance and Reinforcement
Authors: Wang Er-lei
Published: March 2021

Implementing monitoring over construction process of old bridge’s reinforcement serves as an important measure to ensure construction quality and safety and realize the goal of reinforcement. This paper, with a case study of the maintenance and reinforcement project of Zhicheng Yangtze River Bridge (steel truss highway-railway combined bridge), adopted MIDAS to establish finite element analysis model, and with stress and deformation as monitoring parameters, completed the construction monitoring work, numerical simulation analysis and site test for the reinforcement project.
Study on the Effect of Cellulose Ether on the Performance of Concrete
Authors: Xie Dayin , Deng Lei , Shen Jianrong , Yang Yao
Published: March 2021

In this paper, the influence of HPMC, which serves as an admixture, on workability, air content, slump loss and compressive strength of concrete is studied in detail based on a blending method. The test results show that the workability of concrete with a 2% admixture containing 0.04% HPMC can meet the construction requirements under the same conditions. Besides, its air content is 2.1% and the compressive strength of it is the highest. However, when the content of HPMC exceeds 0.04% or more, the air content of concrete will be higher and the compressive strength of it will get lower.
Research on the Method of Engineering Project Schedule Control Based on BIM Technology
Authors: Wu Si
Published: March 2021

The construction industry is developing rapidly, the scale of construction projects is larger and more complex, and the construction period is constantly getting longer, which puts forward higher requirements for the management level of construction projects. The schedule control of construction projects is one of the three major goals of construction project control. Traditional schedule control methods cannot match the needs of modern management. Based on this, this article applies BIM technology to the progress control of construction projects, and studies the progress control method of construction projects based on BIM technology. The article discusses the basic characteristics of BIM technology, analyzes the application of BIM technology in construction project schedule control from the aspects of applicability and feasibility, and studies specific control methods. The article discusses in detail the framework model of schedule control and the preparation of schedule plan, and provides a reference for construction project schedule management personnel.
Innovative Seismic Simulation Methodology Using Fourier Phase Matrix
Authors: Xie Haoyu , Zheng Wanshan , Zhang Wengang
Published: March 2021

In dynamic analysis for seismic design, frequency domain methodology has been utilized for input ground motion generation since the 1960s. An innovative scheme is proposed in the article for seismic simulation based on the matrix of Fourier phase spectra. Compared to the conventional methodology, the proposed scheme enables stability of the simulation results for each trail with different random phase spectra. In the certain scheme, manual modification and screening for random results are avoided and computational efficiency is improved. The scheme is evaluated with a representative response spectrum for seismic design of the nuclear equipment. The simulation result shows that the stability for each trial of simulation is maintained by the modified methodology and the computational efficiency is improved considerably. It is approved that the scheme manages to generate design ground motions reliably and efficiently.
Experimental study on self - reset properties of RC beams with different proportions of SMA wires
Authors: Liu Jiarui , Cui Xian
Published: March 2021

In order to explore the influence of SMA concrete beams with different proportions of SMA wires (unidirectional memory and hyperelastic) on the bearing capacity, five SMA concrete beams were made in this experiment. Twelve SMA wires with a diameter of 1mm were placed in the tensile zone of beams, which were reinforced according to different proportions of SMA. The experimental results show that: Within the range of 0-10kN (25% of the ultimate load of beams), the concrete beams with 70% hyperelastic SMA and 30% unidirectional memory SMA has the best stiffness. But in general, the concrete beams with 30% hyperelastic SMA and 70% unidirec-tional memory SMA has the best stiffness; After the first load, the concrete beams strengthened by SMA wires were heated to make the unidirectional memory SMA wires in the beams recover the deformation, and the second load was carried out. The results show that the beams bearing capacity can be improved when the SMA wires recover deformation after heating. The higher the SMA of unidirectional memory, the improvement of load bearing becomes better. However, it is necessary to adjust the proportion of the unidirectional memory SMA wires and the hyperelastic SMA wires to achieve the best effect on the stiffness and resilience of the beam.
Design and Construction Optimization of Shield Cutterhead Inspection Shaft Based on Numerical Analysis
Authors: Zhao Guoqing , Liu Jintong , Meng Suyun , Zhang Yichao , Yang Yuyou
Published: March 2021

As an effective way to inspect and maintain the shield cutterhead, the safety of the inspection shaft is very important in the process of shield tunneling into the shaft. In this study, numerical analysis was adopted to study the interaction of shaft excavation and shield tunneling process and the response law of stratum deformation. Research shows that during the process of the shield tunnelling into the shaft, the bending moment of the enhanced segment of the shaft has the largest change, followed by the lower part of the regular segment and the shield segment. The smaller the shaft excavation space and the more timely the support, the smaller the ground settlement and influence range. The closer the shield support stress ratio is to 1, the smaller the disturbed area of the stratum. It is suggested that The structure strength, monitoring points and monitoring frequency of the enhanced segment and the lower part of the regular segment need to be strengthened. The construction schedule and safety should be taken into consideration when determining the shaft excavation space and shield support pressure.
The Color Planning Concept of Sichuan New Rural Residential Architecture Based on The Munsell Color System
Authors: Cancan GUO
Published: March 2021

This paper analyzes the color problems of local residential buildings by conducting field research on the color of new rural residential buildings in Sichuan, analyzes and refines the traditional architectural color, natural color and folk culture color of new rural residential buildings in Sichuan by using Munsell color system, and summarizes the principles, methods and standards for planning the color system of new rural residential buildings in Sichuan, hoping to find out the real suitable color for new rural residential buildings in Sichuan. We hope to discover the scientific color ideas for the new rural residential buildings in Sichuan and contribute to constructing new rural residential buildings in Sichuan.
Study on Axial Compression Performance of GFRP Tube Reactive Power Concrete Composite Short Columns with Encased Steel
Authors: Ji Jing , Song Huayu , Jiang Liangqin , Jiang Li
Published: March 2021

In order to study the axial compression performance of the GFRP tube reactive power concrete composite short column with encased steel, a finite element model of the composite short column was established. The constitutive models of steel, RPC and GFRP were selected. The element selection and contact method of each component were explained. The boundary condition and mesh division of the composite column were determined. Based on this, finite element verification analysis of 6 specimens was performed by ABAQUS. The load-displacement curves and the axial compression bearing capacity were obtained. By comparing with the test, the reasonability of the constitutive model and the finite element model of this kind of column is verified.
Effect of Different Mineral Admixtures on the Properties of Pervious Concrete
Authors: Bin Yu
Published: March 2021

Taking pervious concrete with a target porosity of 15% as the research object, the influence of three factors, including the contents of silica fume (mass fraction3%, 5%, 7%), metakaolin (mass fraction8%, 10%, 12%) and Polypropylene fiber content (volume fraction1%, 2%, 3%), on the mechanical properties, permeability and frost durability of pervious concrete were investigated by utilizing the orthogonal testing method. Through the range analysis of the test results, the significant influence degree of the three factors were obtained, and the freeze-thaw cycle test was carried out with the optimal mix ratio. The results indicated that the content of silica fume and metakaolin has the most significant influence on the mechanical properties of pervious concrete, the fiber has the most significant influence on the continuous porosity, but the influence on the compressive strength is small. The best mix proportion was obtained, and the silica fume content is 7%, metakaolin content is 10%, and fiber content is 2%. The results of freeze-thaw cycle test of pervious concrete with optimal mix ratio show that the relative dynamic modulus and compressive strength of pervious concrete decrease gradually with the increase of freezing-thawing cycles, and the change rate of mass loss, continuous porosity increases gradually with the increase of freeze-thaw cycles. The relative residual compressive strength and dynamic elastic modulus of pervious concrete show a parabolic decline trend subjected to freeze-thaw cycles. The results also can provide technical reference for the engineering application of pervious concrete in cold regions.
Application of BIM Technology in the Construction of Long-span Suspension Bridge
Authors: Shuai Song , Guanghui Huang , Yousheng Qian , Xiaoxu Huang , Hongbo Tao , Huiying Ou
Published: March 2021

The construction of bridge engineering projects is developing towards large spans, large volumes and more complex spatial structures. The current bridge construction based on two-dimensional drawings has been difficult to meet the needs of project construction. With the help of BIM software, this paper takes the construction project as the main body, integrates construction organizations such as the surrounding terrain and landforms and construction facilities of the construction site into the BIM software to form a complete three-dimensional simulation diagram, so that the entire project is modeled and parameterized. In order to achieve the project collision checking, heavy and difficult construction scheme simulation, engineering rapid statistics, information exchange and complete 4D construction simulation, effective guidance to the construction site, to provide an efficient and orderly construction management and technical support.
Study on the shear capacity of partially precast castellated steel reinforced concrete beams
Authors: Yang Yong , Zhou Pan , Yao Xukun
Published: March 2021

This paper focuses on the shear capacity of partially precast castellated steel reinforced concrete (PPCSRC). A test including 7 specimens was carried out and parameters of shear span ratio, cast-in-site concrete strength and castellated steel were analysed. On the basis of the current calculation methods, this paper also proposed an equation to calculate the shear capacity of PPCSRC. By comparing the test results and calculation results, the proposed equation can be considered as reasonable.
Study on post-fire performance and residual capacity of steel reinforced high-strength concrete composite columns under eccentric compression
Authors: Yang Yong , Chang Hao , Wang Chen
Published: March 2021

In order to combine the advantages of steel reinforced concrete column, high-strength concrete and precast structures, a new steel reinforced high-strength concrete composite column is presented in this paper. With the aim to explore the post-fire behavior of this composite column under eccentric compression, based on the test results, the commercial finite element software ABAQUS was used to simulate the temperature field and then evaluated that sectional damage. The results indicated that the core temperature of the specimen increases with the increase of the thickness of the protective layer of the section steel, and decreases with the increase of the heating time; the longer the heating time, the more serious the section damage is. Based on the theory of equivalent strength, the reduction coefficient of post-fire strength of concrete was determined. Finally, the calculation method of residual capacity of proposed columns was put forward and verified to be valid.
Exploration of Railway Heritage Renewal Method under the High Line Park Mode——Taking the High Line Park in New York as an example
Authors: Shi Ying , Ding Ye , Pan Ying
Published: March 2021

As an extremely successful case in the renewal of railway heritage, New York High Line Park has aroused the research of many scholars at home and abroad. This paper analyzes and compares a large number of existing cases to classify the existing railway heritage renewal models, and summarize the internal application characteristics and external manifestations of various models. Through the analysis of the common points in the design methods of the New York High Line Park, a representative case of railway heritage transformation, the three functional characteristics of the high line park renewal model are refined, and the combination mode of materials in the actual project and its use are discussed. Functional evaluation summarizes the modular methods of project transformation with the same internal factors, and proposes feasible transformation models. It is of reference significance for future Chinese railway heritage reconstruction projects.
Energy performance evaluation of centralised ice-storage district cooling system
Authors: Li Yehong , Yang Jiankun , Jiang Xiangyang
Published: March 2021

Centralised district cooling system equipped with ice storage has substantial advantages in comprehensive energy utilization and cost effectiveness. It facilitates cutting peak and filling valley of power load and helps saving energy costs by using the peak-valley electricity price. Despite such advantages, energy performance of ice-storage district cooling systems is still a controversial topic, especially there is a lack of effective evaluation methods and relevant evaluation standards in China. Therefore, this paper establishes a thorough index system to evaluate energy performance of ice-storage district cooling system. The index system covers all aspects of ice-storage district cooling systems, including the gradual evaluation of each process from equipment, via subsystem to whole system. Afterwards, the index system is used to analyse a real case, focusing on the eight most important energy performance indexes. The results show that the index system can adapt well to the evaluation requirements, help to find energy performance problems and facilitate to improve energy efficiency. In view of existing insufficiency, further efforts are needed to make in formulating reasonable benchmarks of such energy performance indexes.
Experimental Study on the Viscosity of 1-(2-HE)PP Aqueous Solutions
Authors: Du Xiaoqian , Song Jianyu , Liu Fang , Fu Dong , Wang Lemeng
Published: March 2021

In this paper, we measured the viscosities (η) data of aqueous solutions of 1-(2-Hydroxyethyl)-piperidine (1-(2-HE)PP) by using NDJ-5S digital rotary viscometer. The mass fractions of 1-(2-HE)PP ranged from 0.1 to 1, and the experimental temperatures were 303.2 K, 313.2 K and 323.2 K respectively. The effects of temperature and W1_(2-HE)pp on viscosity were demonstrated. Based on the experimental data of viscosity, we deduced the activation energy
(Ea)
and CO2 diffusion coefficient (Dco2) of 1-(2-HE)PP aqueous solutions.
A scale removal and scale absorption method for circulating water system
Authors: Yang Yao , Li Xiaona , Li Xiang , Li Yuchao , Meng Tianqi , Wu Jinyang , Li Xin
Published: March 2021

In recent years, industrial water consumption keeps increasing, and industrial circulating cooling water accounts for the majority of industrial water consumption. Therefore, reducing the amount of circulating cooling water consumption can effectively save industrial water. Aiming at the high cost and low efficiency of circulating water treatment, this product is designed. The intelligent electronic scale removal and scale absorption device for circulating water mainly consists of two parts: one is the scale removal device, the other is the scale absorption device. Scale removal device does not require the use of chemical agents and salts, is a physical water treatment device, using the principle of capacitance to change the crystallization process of liquid calcium, so that scale loss adhesion, can protect pipes and mechanical equipment, to maximize their service life. Scale absorption device uses low voltage and high frequency current to act on the water through the scale suction device, change the physical structure and characteristics of the water, restore the free state of the scale, and be adsorbed by the scale suction device to achieve the purpose of scale removal. This product is an innovative clean, environmentally friendly water treatment device, in line with the concept of sustainable development.
Study on How to Determine the Methylene Blue (MB) Value of Machine-made Sand and Its Effects on Admixture Dosage and Compressive Strength of Concrete
Authors: Deng Lei , Shen Jianrong , Lu Shengjun , Wang Kongguo , Xie Dayin
Published: March 2021

Machine-made sand is a raw material commonly used in concrete production, and its quality has a very obvious effect on the performance of concrete. This paper conducted an experiment to determine the methylene blue (MB) value of machine-made sand, explored the effects of the value changes on the admixture dosage and compressive strength of concrete, and analyzed the mineral components of machine-made sand. The research results show that the mud dosage in machine-made green sand is relatively higher, and the admixture dosage increases along with the increasing of the MB value. The mixing of different types of machine-made sand has a certain effect on the compressive strength, which reaches the peak at a certain ratio.
Rapid Blockage Diagnosis And Early Warning of Urban Drainage Pipe Network
Authors: li Zhou , Yuhan Cheng , Mei Li , Yiwu Qian , Qingquan Wang , Chu Li , Manchun Liang
Published: March 2021

The core of comprehensive treatment effect of water environment in river basin lies in pipe network system. The blockage of urban drainage pipe network is one of the main reasons affecting the healthy operation of urban drainage network system. So the intelligent analysis method of urban drainage pipe network blockage diagnosis can quickly find the problems of urban drainage pipe network and improve the operation and maintenance efficiency of urban drainage pipe network. In this paper, through the analysis of rainfall data, rainfall and sewage pipe network flow variation regular pattern, the change range, the essay obtains the rain and sewage pipe network blockage diagnosis threshold. Combined with the urban intelligent drainage pipe network system, through the customized setting of pipe network blockage threshold, the rapid diagnosis and early warning of the blockage problem of the drainage pipe network are realized, and the healthy operation of the urban drainage network is guaranteed.
Construction Characteristics and Quality Control Measures Under High Altitude and Cold Conditions
Authors: Yang Junpeng , Li Minyan
Published: March 2021

Restricted by the natural environment factors, the high altitude and cold regions have low air pressure, low air density, large temperature difference between day and night, and long freezing and cold time. During the construction, strict requirements are put forward for the material preparation, material transportation, construction machinery, construction technology, workers’ personal safety and other aspects. Based on the engineering construction in Tibet, this paper studies the optimization scheme of concrete mix proportion and the systematic insulation measures of concrete construction in high altitude and cold regions. The influence of ultra-low temperature on metal welding process is studied. The effects of welding wire selection, welding environment guarantee and worker training on welding quality assurance are studied. The calculation method of mechanical efficiency reduction and the influence of altitude on environmental factors and quota adjustment coefficient are studied. The results of this study provide reference and technical support for the construction in high altitude and cold areas.
A Research of the Section Layout of the Second Phase of the Eastern Route of South-to-North Water Diversion Project: from Hongze Lake to Luoma Lake
Authors: Yang Wanhong , Cheng Jianhua , Li Xiaohong , Wang Kai , Qiang Chao , Yan Chunhua , Gao Zhifa
Published: March 2021

The south-to-north water diversion project is a major strategic project in China to construct the overall pattern of the water resources allocation according to the principle of “four horizontal and three vertical, north-south allocation and east-west mutual aid”. On the one hand, the first phase of the eastern route of the south-to-north water diversion project started construction in December 2002 and was completed in November 2013. After completion, it has played an important role in alleviating the contradiction between supply and demand of water resources due to consecutive drought years in Shandong Province, especially in the Shandong Peninsula, which has ensured the economic and social development and improved the ecological environment in recent years. On the other hand, the second phase of the eastern route will further improve the allocation of water resources in China, ensure the security of water supply in important areas such as Beijing and Tianjin, and further improve the water ecological environment along the route. While the section from Hongze Lake to Luoma Lake is listed as the second section of the eastern route of this project (among 11 sections in total), the water layout, officially approved in the early stage, contradicts the one recommended by Jiangsu Province. On this basis, the key to ensure the smooth implementation of the project of this section is to study its scheme of water distribution in combination with the regional water system, coordinate the functions of flood control, drainage, water supply, navigation and ecology, and put forward an economical, reasonable and technically feasible scheme of water distribution.
Research on Deformation Mechanism of Underground Chamber Surrounding Rock Based on the Influence of Surrounding Rock Stress Path
Authors: mingqun Guo , yongqi Liu , youyan Jing , fuzhang Yan , yanbing Wang , haining Liu
Published: March 2021

During the construction of the pumped-storage power station, problems such as the stability of the surrounding rock of the underground chamber of the powerhouse appeared, which put forward higher requirements for the safety of the construction of the project. How to reasonably analyze and evaluate the stability of the surrounding rock of the underground chamber became a constraint to the smooth construction of the project Obstacles to progress. In response to this problem, a typical underground powerhouse chamber of a pumped storage power station was selected, and for the problems caused by the stress unloading of the surrounding rock during the excavation of the powerhouse chamber, field sampling, indoor triaxial unloading test, and numerical analysis were adopted. The stress path test results are applied to the numerical simulation analysis of different types of surrounding rock and different excavation conditions. The calculation analysis shows that the types of surrounding rock and the excavation conditions affect the arches, arch abutments and spans of underground chambers. Key positions such as the intersection of the arch bottom and the side wall have a significant impact. When the surrounding rock grade is the same, the displacement field distribution characteristics and maximum displacement of the two step-by-step excavation schemes are not much different; when the surrounding rock grade changes from type II to type III, the maximum displacements of the arch top and the bottom of the surrounding rock increase doubled.
A method of determining monitoring indexes for spatial deformation of super high arch dam based on extreme value theory
Authors: Zhang Zhiduan , Li Bo
Published: March 2021

In the long service of arch dam, deformation is one of the main performance parameters which can directly reflect the working behavior of the dam. In order to effectively monitor the safety of dam operation, it is necessary to determine the monitoring control value of deformation. The traditional dam deformation monitoring control values only consider the single point, ignoring the spatial correlation between the measurement points. In order to overcome this limitation, this paper focuses on the spatial distribution characteristics of deformation measuring points of the arch dam, then by building dam deformation field and using the Projection Pursuit Analysis (PPA) project high-dimensional data to low dimensional space. On this basis, the POT model proposed to determine the monitoring control values. The PPA-POT model is applied to practical engineering, and the feasibility and applicability of the method in this paper are tested by comparing with the traditional methods, so as to provide a new analysis technique for the long-term service status safety evaluation of arch dams.
Research on the Current Situation and Countermeasures of Civil Construction Site Management
Authors: Zhao Benyu
Published: March 2021

With the rapid development of modern society and national economy, China’s construction industry has achieved remarkable development, and various management problems have gradually emerged. As the core work of the construction industry, civil construction site management has become a topic of widespread concern in modern society. The civil construction site is a comprehensive management work, which will directly affect the safety of the civil construction site and the normal implementation of the project. It mainly includes the control of cost, material, process and completion. Only the effective interaction of multiple departments can promote the construction of civil construction activities, lay a supporting role for the long-term development of construction enterprises, and improve the timeliness and stability of management work. However, from the current point of view, there are still corresponding problems in the management of some civil construction sites in China, and such problems will greatly affect the overall construction quality. This article will mainly analyze the corresponding status quo and countermeasures in order to provide reference for relevant units.
An optimization model for joint power generation dispatching of the cascade hydropower stations on the lower reaches of Jinsha River and the Yangtze River
Authors: Zhang Song , Zhou Man , Hu Ting
Published: March 2021

The Xiluodu, Xiangjiaba, Three Gorges and Gezhouba cascade hydropower stations, which located at the lower reaches of Jinsha River and the upper reaches of Yangtze River, plays a very important role in the electrical power system in China. To optimize and solve the joint power generation problem of the cascade system with highly complex constraints, hydraulic relationship and multiple dispatching objectives, this research focus on: (1) a mid-and-long term power generation optimization model for the cascade system is established, considering hydraulic and electricty connections, as well as the flood control, water supply and ecology objectives; (2) an improved LSSDC-DDDP hybrid optimization framework, based on the theory of large-scale system decomposition coordination (LSSDC) and the discrete differential dynamic programming (DDDP), is designed to well solving the proposed optimization model. In the optimization framework, a relative coefficient is used to calculate the coordination factor among subsystems (a single hydropower station); meanwhile, an adaptive corridor and a bias corridor are adopted to enhance convergence speed of DDDP. The optimization model is applied in the dispatching calculation of the cascade system using the 2015-2017 actual runoff conditions, respectively. The results indicate that joint optimal dispatching of the cascade system can theoretically increase its yearly total power generation benefit about 2.73 billion yuan on average, simultaneously satisfying the requirements of downstream water supply and improving the total firm output guarantee rate of the system.
Dynamic shear band evolution by the numerical manifold method and the Drucker Prager model
Authors: Fan Zibo , Zheng Hong , Wu Wenan , Zhang Ning , Wang Yichen
Published: March 2021

To simulate the dynamic evolution of shear band in soil, the numerical manifold method (NMM) and the Drucker Prager model (DP) are used. Considering that the soil does not bear tension, the tensile part of DP is cut off. Then the constitutive integration could be reduced to mix complementarity problem, which is solved by the Gauss Seidel projection contraction method (GSPC). The discretization sequence is altered to resolve the transfer issue of degrees of freedom when dealing with dynamic discontinuities evolving. Different with the traditional discretization approach, the discretization of temporal variable is set prior to that of spatial variable so that all the degrees of freedom are valid only in a current step without the necessity to be transferred to the next time step. In this way, the shear band tip could stop anywhere naturally, without being improperly forced to stay on the element edge. For simplicity, the shear band is treated as a strong discontinuity with zero width. The interface contact is described by the NMM contact approach where open-close iteration is involved. Finally, a soil dam is studied to check the capability of the proposed method to capture the dynamic evolution of shear band.