bluuebunny/crossref_metadata_2025_split huggingface dataset:
Research on optimal design of slope anti-seepage
Authors: Wang Zhenyu , Yang Lingqiang , Sun Naidong 
Published: September 2019

Abstract
In order to study the seepage problem of the slope, the seep/w module in geo-studio is used to analyze the sluice of the Tanzhuang reservoir dam in Liaocheng, and the finite element simulation analysis of the slope seepage under different working conditions is obtained. A series of physical quantities such as seepage velocity, seepage flow and saturation line under working conditions. At the same time, the influence of different anti-seepage materials on the seepage of the slope is analyzed. The best combination of anti-seepage effect and economic benefit is obtained. The analysis results show: (1) In terms of anti-seepage effect: Compared with no anti-seepage measures, horizontal anti-seepage can reduce the seepage velocity to 81% before, and the anti-seepage effect is ideal. The vertical anti-seepage effect in the joint action with horizontal anti-seepage is extremely significant, and the seepage velocity can be reduced to 78% before. (2) In terms of project cost: The price of the anti-seepage film is relatively low, but the laying area is large, which requires a lot of manpower and material resources. The pouring concrete anti-seepage wall has a higher cost and the construction is more complicated. For this project, laying an anti-seepage film is more economical. (3) Comprehensive view: In order to combine the anti-seepage effect with the economic benefit, the combined action of the anti-seepage membrane and the anti-seepage wall is the best choice, and joint anti-seepage can be carried out at important parts, and only horizontal anti-seepage can be performed at the secondary position. The results of this study can provide reference for the same type of project, reduce construction costs, and further improve the stability of the slope.
Research on transitional pavement structures based on foundation settlement in goafs
Authors: Guo J J , Yang Z Y , Cheng L , Li X Y , Chen K P 
Published: September 2019

Abstract
Based on actual engineering geological conditions, foundation settlements and the effects of goaf’s positions on the settlements were measured to study the effects of underlying goaf on the road construction. Four transitional pavement structures with various base course were designed in goaf-affected areas. Under the soil consolidation settlement and traffic loading, the mechanical response of transitional pavement structures was simulated and analyzed. The critical safety zone of the goaf was obtained along the depth and the horizontal directions, respectively. The results indicate that the transitional pavement structure containing graded gravel base exhibited the minimum uneven settlement and pavement inclination under the condition of soil consolidation settlement. under traffic loading, the minimum tensile stress existed at the bottom of graded gravel base compared with that of the other three transitional pavement structures. Therefore, the flexible pavement with graded gravel base course is proposed as the transition pavement the mined-out areas.
Study on hazard assessment of mountainous flood in riverside country- a case study in Xinshan, Hubei, China
Authors: Li Zhe , Cai Bin 
Published: September 2019

Abstract
Mountainous riverside countries have already become the weaknesses of flood disaster control infrastructure in China, so flood calculation based on hydraulics models plays a key role in urban flood monitoring, warning and prevention. In order to validate the availability of a proposed one-dimension hydraulics flood model, the paper selects Xinshan County, Hubei Province, China as a typical study area. Considering the river distribution system and flood source analysis in Xinshan County, its flood scale and calculation scheme are then proposed. On the basis of HEC-RAS software, the one-dimension hydraulics model is constructed, which is applied to calculating the river flood evolutions and diffusing embankment processes with the designed flood probability of 0.01, 0.02, 0.05, 0.10, and 0.20 respectively. The comprehensive flood process information (such as diffuse area, diffuse duration and water depth) is also retrieved, which is used to calculate flood hazard and map flood hazard distribution. Calculation results reveal that the main parts of Gufu River basically meet the flood prevention standard of 0.05 (probability) in Xinshan County, while the intersection of Gufu River and Wangjia River has lower flood prevention ability than its flood prevention standard, which are basically consistent with local reality and flood estimation. Moreover, this fact proves that the proposed one-dimension hydraulics flood model is effective.
Study on Anti-seepage Effect of Different Schemes for Upper Reservoir of a Pumped Storage Power Station
Authors: kai Zhang , liqun Xu 
Published: September 2019

Abstract
With the development of geomenbrane, geomenbrane has been adopted in more and more hydraulic engineering as anti-seepage arrangement. A three-dimensional finite element model was built to analyze two different anti-seepage schemes for upper reservoir of a pumped storage power station. Under the reinforced concrete face slab & geomembrane anti-seepage scheme or geomembrane anti-seepage scheme, the seepage field and the seepage discharge of the reservoir were calculated and analyzed under normal conditions and local damage of geomenbrane conditions. It is shown that the seepage characteristic was obviously influenced by the fractured zone around right abutment. Moreover, based on the calculation results, seepage discharge under normal working conditions and local damage of geomembrane was analyzed and it was found out that both schemes were able to satisfied requirements of the reservoir under different conditions. After comprehensive consideration, it is recommended that the reinforced concrete face slab & geomembrane anti-seepage scheme should be adopted as the anti-seepage scheme of the reservoir.
Experimental Study on Seismic Performance of Multiple Ecological Composite Wall
Authors: Hou Lina , Huang Wei , Li Xuehua 
Published: September 2019

Abstract
The multiple ecological composite wall is the main force-bearing component of ecological composite wall structure. Its construction and mechanical properties are quite different from those of standard composite wall. In this paper, the low cycle cyclic loading test of multiple ecological wall is carried out, and the failure mode and process of composite ecological wall are discussed. On this basis, the seismic performance such as bearing capacity, deformation, ductility and energy dissipation are analyzed respectively. The Experimental results show that the multiple ecological wall has better seismic performance than the standard wall.
Analysis of Seismic Fragility of Aqueduct Structure Based on Copula Function
Authors: Zhang Yina , Cheng Gege , Zhang Shuai , Zhang Jianwei , Huang Jinlin 
Published: September 2019

Abstract
Establishing the joint probability distribution function directly of the basic components in the aqueduct system is hard, because of the correlation of seismic demand among components in structural vulnerability analysis. This paper proposed a new method for analyzing the vulnerability of aqueduct structure. A two-dimensional Copula function is introduced to describe the related structures of component seismic demands and simplify the modeling process of joint distribution function. The results show that the failure probability calculated based on Copula function is between the upper and lower bounds of the first-order boundary method. The results help to simplify the modeling process of the aqueduct system vulnerability curve, and at the same time, providing a new way to study the correlation between seismic demand of aqueduct components.
Analysis and seismic behavior verifacation of Zipingpu concrete faced rock-fill dam during Wenchuan Earthquake
Authors: Zhao Mengdie , Han Liwei , Zhang Xianlei , Li Zongkun 
Published: September 2019

AbstractBased on the seismic damage of the Zipingpu dam in Wenchuan earthquake, the stochastic finite fault method with dynamic corner frequency is used to reconstruct the ground motion input acceleration time history of the Zipingpu dam in Wenchuan earthquake, and the dam-base-water seismic response analysis model is established. After analyzing the causes of dam deformation and panel joint dislocation after the earthquake, this paper suggested the comprehensive anti-seismic measures to improve the panel stress. These measures have important theoretical and practical significance for preventing the slab damage caused by extreme earthquakes in the concrete faced rock-fill dam (CRFD).
Study on the Influence of Pore Water Pressure on the Stability of Slope
Authors: Feng Yan , Zhu Feng , Li Senlin , Wu Ye 
Published: September 2019

Abstract
The influence of pore water pressure on slope stability under water drop and seismic action is studied in this paper, taking an embankment as the research object. The temporal changes of seepage field are analyzed first, and then the stability of dam slope is investigated by coupling the stress field with the seepage field. During the process of water drop, the minimum safety factor of slope stability appears at the moment when it stops falling. The greater the falling speed is, the faster the pore water pressure dissipates, and the smaller the safety factor is. Seismic action stimulates the increase of excess pore pressure, and whether to consider the coupling effect of seismic load and pore pressure change will make the results of stability analysis quite different. The cumulative effect of pore pressure may be the crucial factor of the dynamic instability of two-phase media slopes.
Discussion on constitutive relation of concrete creep and shrinkage by numerical calculation
Authors: Han Chunxiu , Shuang Chao , Zhang Jiuchang 
Published: September 2019

Abstract
In order to establish accurate and effective mechanical models of concrete creep and shrinkage by numerical calculation, the problems of parametric finite element analysis by APDL with ANSYS software and constitutive relations of creep and shrinkage by the creep criterion in the software are discussed. The accuracy of calculating creep coefficient and shrinkage strain by theoretical calculation and numerical simulation is analysed with an example. The calculation results show that the results from the two kinds of methods are in good agreement. It can get very good results to simulate the constitutive relationship of concrete creep and shrinkage by the software, achieving the basic function of accurately describing the long-term deformation effects of concrete. This function is the first and most important step in accurately simulating the long-term effects of complex constructions.
Analysis of seismic damage process of high concrete dam-foundation system
Authors: Cheng Heng , Zhang Guoxin , Jiang Chenfang , Liao Jianxin , Zhou Qiujing 
Published: September 2019

Abstract
In the anti-seismic analysis of concrete high dams, only the damage cracking of the dam concrete is usually considered, and the nonlinear characteristics of the dam foundation rock during the earthquake are not considered. Taking the Koyna gravity dam in India and Shapai arch dam in China as examples, this paper adopts the nonlinear time-history analysis method and takes into account the comprehensive influence of the radiation damping of infinite foundation, the hydrodynamic interaction between dam and reservoir, the nonlinear dynamic contact between various joints in the dam body and foundation, and the damage of dam concrete and foundation rock mass in the damage evolution process, analyzes damage evolution process of dam body-foundation system under earthquake action and the influence of foundation rock mass damage on seismic failure mode of concrete dam-foundation system, and compares the numerical simulation results with the actual earthquake situation. The calculation results show that after considering the damage of the dam foundation rock mass, the rock mass of the dam heel firstly appears to be damaged under the action of the earthquake and gradually expands into the interior of the foundation. The dam heel and the foundation surface are not damaged. The numerical simulation results are more in line with the actual situation of earthquake.
Numerical Analysis of Pipeline Vibration Characteristics in Large Pumping Stations
Authors: Cundong Xu , Junjiao Tian , Dongmeng Zhou , Zhipeng Yao , Fengyou Gu , Peng Zhang 
Published: September 2019

Abstract
This paper focuses on the high frequency vibration of the pipeline structure during operation of the large cascade pumping station. In order to explore its causes and inherent vibration characteristics, this paper takes #1 pressure pipeline of No.7 pump of Gansu Province Jingdian Project as the research object. The principle of additional mass method is used to establish a simplified fluid-solid coupling simulation model, and then the model is used to carry out numerical simulation test on the pipeline under different unit opening and closing conditions. After analyzing the numerical results of the simulation, the vibration mode and displacement deformation law are discovered and compared with the DASP field monitoring results. The results show that: under four representative working conditions, the vibration deformation of the pressure pipeline mainly occurs in the elbow section and the connecting section of the large and small tubes; the amplitude of the vibration mode increases with the increase of the modal order; furthermore, the water outlet pipe that is not easily vibrated in the high-order mode is gradually vibrated and deformed; in addition, the numerical simulation results are in good agreement with the field test results. This research can provide reference for the optimization design of pipeline vibration isolation and vibration reduction, and also provide a theoretical basis for the subsequent research on pipeline structural damage diagnosis and its safe operation.
The deteriorated microstructure characteristics of fly ash doped cementitious materials by dissolution
Authors: Li Xiang , Liu Chunfeng , Lu Chao , Peng Ziling , Li Jiazheng , Xingdong LV 
Published: September 2019

Abstract
The microstructure differentia of fly ash doped cementitious materials between before and after dissolution was observed by XRD and MIP to analyze the microstructural deterioration characteristics of different samples. Results showed that there were great changes in hydration products, cement clinker and fly ash particles after dissolution. Pore structure evolution during dissolution indicated that the effect of C-S-H decalcification on pore structure was not negligible and the traditional definition between the harmful pore and the harmless pore was not applicable.
A Comparative Study of Cement-Bentonite and Cement-Based Remediation of Lead-Contaminated Soils
Authors: He Liang , Li Xiongwei , Wang Man 
Published: September 2019

Abstract
The mixture of bentonite and cement at a mass ratio of 2:1 (recorded as BC) was used as solidifying agent to repair lead contaminated soil, and traditional cement (PC) was used as contrast solidifying agent. The comparative test results show that the soil restoration and maintenance period reach 7 days and 28 days respectively. Compared with PC solidified soil, the pH and EC value of BC solidified soil is lower, and the pH value and EC value of 4% and 8% BC-solidified soil meet the interval value needed for vegetation growth. The dissolution of heavy metals in BC-solidified soil and PC-solidified soil decreases with the increase of the content of solidifying agent. At the same content, the dissolution of heavy metals in BC-solidified soil is lower, which indicates that the mixed material (bentonite + cement) has better effect on the fixation of heavy metals. The unconfined compressive strength of BC-solidified soil and PC-solidified soil increases with the increase of the content of solidifying agent, but compared with PC-solidified soil, the unconfined compressive strength of BC-solidified soil decreases significantly. Lower unconfined compressive strength is beneficial to the secondary development and utilization of solidified soil. The above research results show that the mixed material of bentonite and cement can effectively fix the heavy metal lead in the soil, avoid the excessive strength of the soil, and consequently cause soil hardening and influence the re-development and utilization. The mixed material is a feasible and economical repair material.
Study on the Reasonable Spacing of Post-pouring Zone for 50m Long Inverted-T Type Concrete Structure on Soft Foundation
Authors: Jiang Mengyuan , Deng Kaidi , Xu Pu , Wang Xiangrong , Qiang Sheng 
Published: September 2019

Abstract
There are a large number of inverted-T type concrete structures on soft soil foundation in the Yangtze River Delta area of China. Setting post-pouring belt is one of the effective methods to reduce the cracking of such structures during construction. However, there is still a lack of reference standard on how to quantify the interval between the post-pouring belts under different conditions. For this kind of structure, natural silo positions in three pouring seasons are considered, and the post-pouring belts with different spacing are set up in the base plate and pier wall. The stress development during the construction period of the concrete under different combination conditions are simulated by finite element method (FEM). The results show that under the condition of load during the construction period, the pouring blocks of the base plate on the soft foundation do not need to be provided with a post-pouring belt. While the pier wall is constrained by the base plate, the maximum tensile stress of the pier wall has a positive correlation with the maximum temperature of concrete.
Experimental Study on Impermeability of Waste Fiber Recycled Concrete
Authors: Xiaohu LI , Lei LI 
Published: September 2019

Abstract
The natural diffusion method was used to test the impermeability of waste fiber concrete. The influence of fiber volume rate and fiber length on the impermeability of waste fiber recycled concrete was studied. The results show that the influence of fiber length on the impermeability of recycled concrete is greater than that of fiber volume ratio. When the length of the fiber is 19mm and the volume ratio of the fiber is 0.16%, the impermeability of the specimen is the best.
Experimental study on bearing behaviour of different uplift piles
Authors: Zheng Ai-rong , Zhuge Ai-jun 
Published: September 2019

Abstract
Based on pile load test results of uplift bored piles for a deep-embedded underground transformer substation, the uplift behaviour of enlarged toe pile and shaft post-grouting bored piles have been studied. The loading transfer characteristics and uplift capacity improvement mechanism for the two different type uplift piles have been investigated. The research shows that post-grouting can significantly improve bored pile uplift bearing capacity. After pile shaft grouting, the interface condition between pile and soil is improved, the friction resistance of pile side is increased obviously, and the uplift bearing capacity is improved. For long uplift pile, the uplift resistance of shaft grouting bored pile is better than that of enlarged toe pile.
Experimental study on fractal characteristics of coarsegrained soil filler for high-speed railway subgrade
Authors: Wang Qiyun , Zhang Zhiliang , Lin Huaming , Wan Qian , Xu Jianwei 
Published: September 2019

Abstract
This paper takes coarse-grained soil filler of high-speed railway subgrade as object of study, completes a series of coarse grained soil compaction tests under different moisture content with electric heavy compaction apparatus type YX-30, and obtains the granularity fractal distribution curve with coarse-grained granularity fractal model. The result shows that coarse-grained soil filler has obvious fractal characteristics after compaction, and particle breakage fractal dimension between 2.61-2.82. With the increase of fractal dimension, the maximum dry density increases first and then decreases, and the maximum fractal dimension is under the optimum water content. The coarse-grained soil with high clay content has lower particle size and smaller fractal dimension before and after compaction. Water content and clay content are two important factors that affect the crushing of coarse-grained soil. The effect of clay content on particle size is more significant than that of clay content.
Microstructure and Mechanical Properties of Polyphosphoric Acid Modified Asphalt
Authors: Wang Zihao , Wang Lan , Li Chao , Ren Minda 
Published: September 2019

Abstract
Based on atomic force microscopy (AFM), PPA modified asphalt, SBS modified asphalt and PPA composite modified asphalt were tested. The microstructure and Micro-Mechanical Properties of the three modified asphalts before and after aging were analyzed with different evaluation indexes. The results show that PPA modified asphalt has good adhesion and deformation resistance, and the anti-deformation ability is more remarkable after aging, which is obviously superior to the other two kinds of modified asphalt in anti-aging performance; PPA modified asphalt and PPA modified asphalt have higher peak density, larger surface free energy and better adhesion performance, which is conducive to improving the interface adhesion between asphalt and mineral. For PPA composite modified asphalt, the addition of PPA improves the storage stability and aging resistance of SBS modified asphalt, which is superior to SBS modified asphalt in deformation resistance and cracking resistance, and has the effect of taking into account both high and low temperature performance. The micro-performance of asphalt based on AFM provides a basis for macro-performance analysis.
Experimental study on dynamic shear modulus and damping ratio of remolded loess
Authors: An Liang , JinDeng  
Published: September 2019

Abstract
Dynamic shear modulus and damping ratio are two important parameters to characterize the dynamic characteristics of soils. In this paper, the influence of dry density and consolidation pressure on dynamic shear modulus and damping ratio of remolded Guyuan loess is studied by resonant column tester. The results show that The maximum damping ratio decreases with the increase of dry density and consolidation confining pressure. Under the same dry density condition, the dynamic shear modulus ratio of loess increases with the increase of confining pressure; the damping ratio decreases with the increase of confining pressure; under the same confining pressure, the dynamic shear modulus ratio of loess increases with the increase of dry density, and the damping ratio decreases with the increase of dry density; the research results can provide basic information for site seismic response analysis and engineering construction in this area.