bluuebunny/crossref_metadata_2025_split huggingface dataset:
Stress and Deformation Analysis of High Concrete Face Rockfill Dam Based on COMSOL Multiphysics
Authors: Wang Runying , Yu Keping 
Published: February 2021

Abstract
In order to study the stress and deformation characteristics of the high concrete face rockfill dam over 100 meters, in this paper, Duncan-Zhang E-B nonlinear elastic hyperbolic model is adopted, the finite element software COMSOL Multiphysics is used to establish the model and the MATLAB function is used for secondary development to analyze the stress and deformation of the concrete face rockfill dam of the Panshitou reservoir. The stress and deformation characteristics of the concrete face rockfill dam at the completion period, normal water storage condition, designed flood level condition and checked flood level condition are obtained through analysis, which provide theoretical guidance for the construction and operation of the high concrete face rockfill dam of more than 100 meters.
Study on mechanical properties of triaxial unloading of granite under pore pressure
Authors: Ren Jianxi , Yun Mengchen , Zhang Kun 
Published: February 2021

Abstract
This research analyzes the strength and deformation characteristics of rock samples under varying pore pressures during the unloading process. By using fine-grained granite from Western China as the research exemplar, laboratory tests of triaxial unloading under pore pressure are conducted by utilizing the unloading confining pressures method without changing the axial pressure. Pore pressure is tested with a design value of 5 MPa. When the confining pressures are released at 35, 25, 15, and 5 MPa, the pore pressures drainage valve are opened, and the mechanical properties of fine-grained granite under pore pressures are analyzed. The following results are obtained. After unloading at different confining pressures, pore pressure has an evident influence on the stress–strain curve of the rock sample. The bearing capacity of the rock sample decreases. The hole pressure has a significant effect on the ring and volume deformation in the unloading process. Consequently, the evident deformation and damage are generated immediately after unloading to 25 MPa. Under the condition of constant pore pressure for a long time, numerous tension fractures are distributed around the main shear fracture owing to the promotion of pore pressure on the fracture opening. Hence, an evident swelling phenomenon occurs in the rock sample.
Study on thermal fracture modeling by the Scaled boundary finite element polygons
Authors: Wen Zhou , Zhong Hong , Tu Jin , Liang Hui 
Published: February 2021

Abstract
Thermal load is an important cause of structural fracture. A model based on the Scaled boundary finite element method (SBFEM) is presented for the fracture modeling due to thermal load. The SBFEM is a semi-analytical method, which has the advantages of both the Finite element method (FEM) and the Boundary element method (BEM) while possessing its own special features. The structure is discretized only at the boundary, thus reducing the dimension of solution. In addition, the stress field and displacement field are obtained analytically in the radial direction, so the stress intensity factors can be obtained directly from its definition and this works for homogeneous material, bi-material and orthotropic material. In the presented model, the temperature load is transformed from the temperature field of the structure, which is included in the structural analysis to get the displacement field, stress field and therefore the stress intensity factors. By introducing the polygon technique, the remeshing process due to crack propagation can be modeled conveniently. Two numerical examples including a rectangular plate and a cross plate are employed for verification of the model.
A study on energy distribution law of frame structure across ground fissure
Authors: Zhongming XIONG , Yixin LIU , Xuan CHEN , Jianjian XU 
Published: February 2021

Abstract
In order to study the frame structure energy dissipation mechanism on the ground, a 3x3 span 5-story frame structure was used as the research background, and a shaking table test with a scale ratio of 1:15 was designed. Based on the prototype structure, a finite element model based on ABAQUS is established. The correctness of the finite element model is verified by experimental comparison. On this basis, the plastic energy dissipation and damping energy consumption of the structural beam and the plastic energy dissipation law of the column are analyzed. The weak part of the structure of the trans-ground fissure structure under energy conversion is found. This study provides a reference for the arrangement of energy-consuming devices in seismic design and disaster prevention and mitigation design for similar structural engineering.
Analysis of Influencing Factors on Durability of Sludge Flow Solidified Soil
Authors: Yue Shaolin , Feng Zhongmin , Wu Mingjiang , Ding Jihui , Gan Yu , Wang Guanghong 
Published: February 2021

Abstract
In order to transform a large amount of dredged sludge into sustainable development of land resources, this paper takes the submarine dredged sludge in Dalian Bay as the research object, and uses the composite solidified material composed of cement, fly ash and phosphogypsum to carry out flow solidification treatment. Through laboratory experiments, the influence of curing temperature, dry-wet cycle and freeze-thaw cycle on the sludge flow solidified soil was studied. The results showed that:(1) When the fly ash-cement mass ratio RFC=0.65 and the cement-sludge mass ratio RCS=0.09-0.16, the unconfined compressive strength of the 35°C sludge flow-solidified soil is the mud-solidified soil in the outdoor curing environment 1.04 times.(2) When RCS=0.11∼0.14 and RFC=0.65, the strength loss rate of silt-solidified soil after the first dry-wet cycle is the highest, respectively 43% and 50%.(3) When RCS=0.09∼0.16 and RFC=0.65, after the third freeze-thaw cycle, the strength loss rate of the sludge solidified soil is the smallest of the first five times.
Study on Tensile Stress-Strain Relationship of BFRC
Authors: He Jingjing , Shi Junping , Zhang Yong , Wang Haiting , Lu Haodan , Fan Lihao , Min Yongtao 
Published: February 2021

Abstract
In this paper, different types of basalt fiber concrete (BFRC) were been researched on the tensile properties. Moreover, analyzed the influence of fiber length and fiber volume fraction on the tensile properties of concrete. The results showed that the tensile strength of BFRC increased significantly with the increase of fiber volume fraction, and the strain increased significantly with the increase of fiber length. The BFRC tensile stress-strain curve shows obvious staged failure, and the function of stress-strain relationship based on the regression method has burning relevance with the test results.
The influence of materials parameters on chloride diffusion coefficient in concrete
Authors: Ding Ping-xiang 
Published: February 2021

Abstract
In order to investigate the influence of materials parameters on chloride diffusion coefficient in concrete, experiments were conducted by orthogonal design and factorial design, and 15 sets of concrete specimens with different mix proportion were prepared. RCM test for each concrete specimen was performed to determine the chloride diffusion coefficient. Results show that water-to-binder ratio, replacement of mineral admixtures and the ratio of replacement of fly ash to replacement of granulated blast furnace slag have a significant influence on chloride diffusion coefficient, but the water-to-binder ratio is the most important one.
Analysis on Risk Control of Civil Engineering Cost Based on BIM Technology
Authors: Yang Yaru 
Published: February 2021

Abstract
With the rapid development of my country’s construction industry, people’s requirements for construction quality and safety control are becoming more and more stringent. However, the results are often unsatisfactory, and the cost risk in civil engineering construction still cannot be effectively controlled. This article aims to study the risk control analysis of civil engineering costs based on BIM technology. This article analyzes the experiment from the perspective of quantification. The Experimental Integration Facility Engineering Center has conducted research on multiple BIM projects and learned about the actual operation status of these projects. Then summarize the actual effect of BIM technology. Experimental data shows that the use of BIM technology can improve the quality of design, quickly determine project cost, control design changes, avoid rework, and reduce costs. The experimental results show that the use of BIM can reduce the time used to estimate the cost to 35%, the accuracy of the estimate is controlled to <5%; the extra-budgetary changes are reduced to 70%; through the discovery and resolution of conflicts, the contract price is reduced by 13%; The project time has been reduced by 10%, and investment income can be obtained relatively quickly. Therefore, the research on construction hazard management and control based on BIM technology can not only promote the development of BIM information technology, but also make up for the inefficient and imperfect defects of hazard management and control, and greatly improve the cost risk of civil engineering.
Axial compressive behaviour of double steel-concrete shear wall constrained with ribs and bars
Authors: Xinzhi ZHENG , Shuang ZHENG , Yutao SUN 
Published: February 2021

Abstract
The double steel-concrete shear wall combines the advantages of steel and concrete effectively, with high bearing capacity, good plasticity, superior seismic and fire resistance performance, saving materials and simple construction, and has obvious advantages in the application of high-rise buildings, especially super high-rise buildings. Research on axial compressive behavior of double steel-concrete shear wall constrained with ribs and bars is less. In this paper, the constitutive relation of double steel-concrete column with ribs and bars is used to change the relevant parameters and program to analyze the influence of ribs and bars on the axial compression performance of double steel-concrete shear wall.
Viscoelasticity Evaluation of Regenerated Asphalt Containing Waste Engine Oil Based on Rheological Analysis
Authors: Xiao YAJUN , Wang WENTONG , Wang WENWEN , Yuan DONGDONG 
Published: February 2021

Abstract
In order to explore the viscoelastic properties of waste engine oil (WEO) on mixed asphalt, mixed asphalt was prepared by fusing base asphalt and aged asphalt. The effect of waste engine oil content on the physical and viscoelastic properties of asphalt mixtures was studied through experiments. The test results show that the viscosity and softening point of asphalt mixture is reduced by adding waste engine oil. The complex modulus (G*) of asphalt binder decreases with the addition of waste oil at different test frequencies. With the increase of waste oil content, the phase angle (ä) of asphalt mixtures increases at specific frequencies. When the content of waste oil exceeds 6%, G* and δ will not change significantly. The stiffness increase caused by ageing asphalt in mixed asphalt will be offset by adding 2-4% waste oil. This indicates that waste oil can be used as regenerant to provide elasticity and flexibility for asphalt binder.
Simulation of the anoxic effect of ecological regulation on Guanting Reservoir
Authors: Sun Xianren , Zhou Gang , Zhao Gaofeng , Huang Guoxian , Xiong Yongfeng , Lei Kun 
Published: February 2021

Abstract
Water transfer is an effective approach to improve water quality in reservoir area. However, the research focusing on optimum efficiency of water transfer is limited, especially the dissolved oxygen (DO) in reservoir area. As a case study of Guangting reservoir (GTR) in Beijing City, the three-dimensional DO model was built based on environment fluid dynamic code (EFDC). And the spatial and temporal distributions of DO concentration with and without ecological regulation were analysed. The results show that both water transfer and ecological discharge will disturb the "oxycline” of the water body, while the effect on the surface DO is not obvious, ranging from -4.65% to 7.28%, but it has a significant impact on increasing oxygen in the bottom layer. The DO concentration in the bottom water increased by 1.85-8.52 mg/L when the output ecological discharge was used in the reservoir, and the oxygen enrichment effect of bottom water was more obvious when considering water transfer and ecological discharge simultaneously, with an increase of 2.71-12.83 mg/L. this study has the guiding significance to improve the dissolved oxygen in the bottom water of GTR area, and can also provide a method reference in evaluating the DO variation driven by the upstream water transfer or ecological discharge similar reservoirs.
The Connotation, Characteristics, Main Contents and Evaluation Research System and Construction of Ecological Irrigation District
Authors: Wang Yingying , Zhang Hengjia 
Published: February 2021

Abstract
Due to the construction of irrigation districts always aims at maximizing project benefits, coupling with the impact of climate change and human activities, the ecological environment of the irrigation areas has faced severe challenges, so, the construction of ecological irrigation areas and the formation of a systemic ecological production view are essential for realizing the modernization of irrigation areas and sustainable agricultural development. This paper briefly introduced the connotation, characteristics, main contents and evaluation research system of ecological irrigation districts by consulting literatures, summarized the current research and construction of ecological irrigation districts facing problems, and the inevitability of ecological transformation of irrigation districts. Integrating the overall development of irrigation areas and the harmonious coexistence concept of human and nature, the construction of ecological irrigation areas in the future will continue to move forward, and the research on relevant theories and technical systems has broad prospects.
Progress and Prospects of Research on Ecological Impact of Channel Regulation Structure
Authors: Li ShengJie , Tong Sichen 
Published: February 2021

AbstractFocusing on the aquatic ecological and environmental problems of waterway regulation structure, the research progress of waterway regulation structure on the physical and chemical properties of river water bodies, river benthic community structure and distribution and fish habitat was summarized, and the existing problems in current scientific research and engineering application were analyzed. Key researches were also put forward that should be carried out in the future for the protection of water ecological environment of waterway regulation structure including constructing and protecting the regional river ecological health index system in the waterway regulation building area and improving the construction of ecological waterway.
Effect of Different Irrigation Patterns and Covering Methods on Onion Yield in the Hexi Corridor
Authors: Deng Haoliang , Wang Peng , Xiao Rang , Zhang Hengjia , Zhang Yongling , Wang Jiaqi , Chen Tao , He Wenbo 
Published: February 2021

Abstract
In order to investigate the influence of the yield and water use efficiency of onions in the Hexi Corridor, this paper tested the yield and water use efficiency of onions in the Oasis by using the early golden dragon onion as a test material and randomly grouped it into different irrigation modes and cover methods. There were five treatments in the experiment, and the dry matter accumulation process of onion was measured in each reproductive period, and the results showed that: The black mulch full irrigation treatment T1 yielded 120393.45 kg⋅ha−1 with an output value of 72236.07 yuan⋅ha−1, while the black mulch moderate loss adjustment irrigation treatment T3 yielded only 61697.39 kg⋅ha−1and 37018.43 yuan⋅ha−1. The yield per square meter, irrigation water use efficiency and water use efficiency decreased with the increase of regulated deficit irrigation degree, and there was no significant difference between black film mulching and transparent plastic film mulching, but they were significantly higher than that of fine sand mulching. The onion yield and water use efficiency indexes were combined, so that the best control of yield could be achieved by covering the onion with black mulch and irrigation throughout the growing season, which is of theoretical guidance and significance for onion cultivation in the Hexi Corridor.
ShiTouzhai hydropower station hub layout pattern comparison research of pre-feasibility study stage
Authors: Shaohong Pan , jiajia Ding , changjie Luo 
Published: February 2021

Abstract
The selection of the layout scheme is the key content of the pre-feasibility study of large and medium-sized hydropower stations. Based on the topographical and geological conditions, and considering the construction conditions, reservoir flooding, project investment and other factors, this paper makes an in-depth analysis of the layout comparison and design of the pre-feasibility stage of Shitouzhai Hydropower station, in order to provide beneficial inspiration for similar project design.
Experimental Study on the Physical Model of Breakwater at a LNG Wharf in Pakistan
Authors: Xiaochang Ni , Xu Zhao , Ning Guan 
Published: February 2021

Abstract
In this paper, a two-dimensional physical model was established in a laboratory sink, the stability of a breakwater structure at a LNG terminal in Pakistan was studied, and the wave propagation simulation of two designed cross-sections was studied. And make conclusions to evaluate the layout scheme and provide a reference for other similar structures.
Effect of organic content on compression properties of municipal sewage sludge
Authors: Ruimin YANG , Zhenning ZHANG , Zihao FAN , Lu SHEN , Jinhui LI , Bang ZHOU 
Published: February 2021

Abstract
Urban sewage sludge is rich in a large amount of organic matter, which has a significant impact on the compression characteristics of sludge, and ultimately affects the landfill disposal and resource utilization of sludge. Quartz sand was mixed into the sewage sludge to prepare sludge samples with an organic content of 8%, 16% and 26% (raw sludge) respectively, and then a standard consolidation test was carried out to explore the influence of the organic content on the compression properties of the sludge and mechanism of action. The results show that the compressibility of urban sludge increases with the increase of organic content. The compression coefficient and index of sewage sludge both increase exponentially with the increase of organic content. The ln(1+e)∼lgp curve of urban sludge has a significant "inflection point" and a certain consolidation yield stress. With the increase of organic content, the consolidation yield stress decays exponentially. Organic matter in the sludge has a flocculent structure and a large specific surface area. It is easily adsorbed on the surface of the clay particles, hindering the cementation of the clay particles and reducing the permeability of the sludge. At the same time, organic matter has water-retaining property, hinders the consolidation and drainage of sludge, and ultimately affects the compression properties of sludge.
Study on anti-seepage treatment and seepage control effect of core dam foundation curtain of the fault fracture zone in Xinjiang province
Authors: Cui Hao dong , Chen Liang , Wang Jin long , Zhang Wei 
Published: February 2021

Abstract
The treatment effect of dam foundation fracture zone is related to dam safety, A case is provided base on the fault-fracture zone with large permeability in a core dam foundation in Xinjiang province, The dam foundation seepage model is established with the seepage finite element method base on The test results of post-grouting in the fault-fracture zone, simulation working conditions of different curtain depth and permeability indicate that significant impervious effects of compound grouting and depth-curtain at fault zone, leakage is less in the dam foundation and seepage stability meet the requirement on the riverbed overburden in the downstream, The results are high reference value for similar projects.
Comparison and investigation on tidal levels designed for the coastal embankments in Guangdong-Hong Kong-Macao Greater Bay Area
Authors: Fang Shenguang , Cui Liqin , Lv Wenbin 
Published: February 2021

Abstract
Tidal levels designed for coastal levee in Pearl River estuary have been provided by Department of water resources of Guangdong Province in 2002 and played important role in ensuring the security of coastal cities in recent decades. However, big changes have taken place in the hydrological regime of the estuary as the sea water level rise and Frequent storm surges in recent years. The proportions of the coastal levee lengths in Guangzhou and Zhuhai city occupied a large part of the portion in the Bay Area, about 30% and 23% respectively, while the shortest in Shenzhen city, accounting for only 5%. The designed tidal levels used for coastal levees in the past were compared with those proposed by PRWRC in the year 2011, showing lower about 0.2∼0.5m totally in the mouths and open waters including Shiziyang of the estuary. It would reach to about 0.6∼0.7m lower in the waters around Nansha district after considering the influence of the typhoon Mangkhut and Hato, while there was little variation in the net river area upstream in any case. The controlled tidal levels designed for coastal levees were analyzed for its applicability and it showed that those used in Guangzhou, Shenzhen and Jiangmen city meet the requirements and were somewhat lower in Dongguan, Zhuhai and Zhongshan city under variation of hydrological regime recently.
Seepage improvement test and analysis of granite residual soil
Authors: Hu Hua , Wu Xuan 
Published: February 2021

Abstract
The influence of slag powder, cement and bentonite on the permeability coefficient of granite residual soil at different incorporation ratios was analyzed by means of seepage test with variable head. Meanwhile, the permeability coefficient was compared with that of the original granite residual soil. It is found that the effect of slag powder on reducing the permeability coefficient of granite residual soil under non-alkaline environment is limited. The effect of cement on decreasing permeability coefficient of granite residual soil is obvious. Bentonite has the best effect on reducing permeability coefficient of granite residual soil.
Comprehensive Evaluation of Water Environment Under “Zero direct discharge of sewage” Project
Authors: Zhangbin Fang 
Published: February 2021

Abstract
This paper takes Yuhuan City as the research object, based on the single factor evaluation method, Nemero index method and gray relevance analysis method, selects three indexes of ammonia nitrogen, total phosphorus and permanganate index. By analyzing the main pollutants, the reduction of each pollutant and the differences between different evaluation methods, the effectiveness of water environment governance is evaluated, and then targeted regulatory measures are proposed to further improve water environment. The results show that the main pollutants in Lupu Town, Yuhuan City are NH3-N and TP. The single factor evaluation method and the Nemero pollution index method showed that the water quality categories are mostly type III and type IV. The evaluation results of the gray correlation analysis method are mostly Class II water, and all three methods indicate that most of the sites before the construction meet the Class IV water standard. During the construction process, the single factor evaluation method and the Nemero pollution index method show improvement in water quality, while the grey correlation analysis method showed little change in water quality categories. According to the various indicators and water quality changes, it can be seen that the effect of the zero-drainage project is significant for the improvement of river water quality.