bluuebunny/crossref_metadata_2025_split huggingface dataset:
Research on Anti-abrasion Property of Waterborne Epoxy Mortar Based on Underwater Steel Ball Method
Authors: Yu Liang , Guo Jia-chen , Ma Yue , Zhang Lei 
Published: September 2019

Abstract
Waterborne epoxy emulsion modified mortar has been paid more and more attention and applied in the field of hydraulic construction. Its physical and mechanical properties, especially the anti-erosion properties, are the key influencing parameters applied to the drainage structures such as sand tunnel and spillway dam surface. A high-speed underwater steel ball punching tester was used to simulate the impact of pushing mass on the abrasion resistance of water-borne epoxy mortar. In this paper, the abrasion resistance of mortar under different rotational speeds and different grades of grinding steel balls are analyzed, and the test parameters of underwater steel ball method suitable for waterborne epoxy mortar are explored, then a method for predicting the punching and grinding life of mortar is well proposed. The research results provide a basis for the application of water-borne epoxy mortar to hydraulic structures required by anti-impact abrasion.
Seismic Behaviors on CFGRD
Authors: Yan Qian , Wu Di , Wang You-bo , Wang Ya-jun , Gan Xiao-qing , Dong Zhi-hong 
Published: September 2019

Abstract
The goal structure is the concrete-faced grouted rockfill dam (CFGRD) in Zhoushan of China. Based on the properties non-linearity, the structural interaction and the seismic uncertainty, the dynamic non-linear constitutive model has been established in order to evaluate the seismic safety of the CFGRD as well as its interactive zones. Their dynamic sensibility has also been explored with the dynamic FEM. According to the results of the comprehensive dynamic response field distributions, the rock-bolts family of the CFGRD plays the principal role for the seismic safety.
Two-dimensional dynamic analysis of seismic slope stability using DEM coupling with strength reduction technique
Authors: Wu Weidong , Zhang Fei , Hu Kangjun , Ye Min , Ge Bin 
Published: September 2019

Abstract
The seismic stability of earth slopes attracts more attentions. In this study, the two-dimensional dynamic analyses of slope stability subjected to earthquakes are conducted by DEM. In order to prevent boundary effect in dynamic analysis, the quiet boundary is applied in the model, which can fully absorb seismic waves. The progressive failures are clearly observed. The obtained slip surface is in good agreement with that determined by pseudo-static method. In order to calculate the factor of safety using DEM, the strength reduction technique is adopted. A numerical example regarding the instability of the soil slope induced by earthquake shows the validation of the strength reduction technique. In the procedure, several failure criteria are proposed to determine the global instability of the slope. The factor of safety is defined and then compared with the results from other methods. It demonstrates that the discrete element method with strength reduction technique is a promising and feasible method for assess the seismic slope stability.
Assessing the Stability of Poor Drainage Soil Slopes Under the Combined Effect of Water Level Drawdown and Rainfall
Authors: Tang Libin , Wang Ling , Zhang Wengang 
Published: September 2019

Abstract
In rainy season, the reservoir water level sometimes decreases greatly for the requirement of flood discharge. Such phenomenon may cause severe landslides for poor drainage soil slopes. Therefore, it’s necessary to assess the slope stability under the combined effect of rainfall and water level drawdown. In this study, a homogeneous soil slope was modelled to investigate the relative importance and failure mechanism of water level drawdown and rainfall. Both the “factor of safety” (FOS) and the “probability of failure” (POF) were computed in the analysis. The numerical results show that landslides are more susceptible to water level drawdown, while rainfall is a secondary influence to poor drainage soil slopes, subjected to the combined effect of water level drawdown and rainfall.
Analysis on Early Warning Capability of Gansu Earthquake Early Warning Stations Network
Authors: Pan Zhangrong , Tian Xiufeng , Zhang Weidong , Yuan Jie 
Published: September 2019

Abstract
This paper briefly introduces the structure and network layout of Gansu Earthquake Early Warning Stations Network, and discusses the relationship of the effective early warning time and the radius of early warning blind zone with consumed time for early warning. Based on the layout of the current and future earthquake early warning stations network of Gansu, the consumed time for early warning under three stations triggered and six stations triggered is calculated and analyzed. In addition, the contour map of consumed time for early warning in Gansu is drawn. The results show that the effective early warning time is negatively correlated with consumed time for early warning, and the radius of the early warning blind zone is positively correlated with consumed time. And the consumed time for early warning of the future earthquake early warning stations network under three triggered stations and six triggered stations in Gansu is shortened by 29.24% and 37.13% compared with those of the current earthquake early warning stations network. After the completion of the Gansu Subproject, the effective early warning time will be increased and the radius of the early warning blind zone will be reduced, then the early warning capability in Gansu is to be greatly improved.
Experimental Study on Shear Strength of Geomembrane Welding Seams under Different Inflation Time and Pressure
Authors: Zhizhou Geng , Chengfeng Zheng , Kai Xu 
Published: September 2019

Abstract
The shear strength of geomembrane welding seams (GWSs) is one of the key factors for the reliability of geotechnical anti-seepage system. In order to study the evolution law of shear strength of GWSs under different inflation time and pressure, the weld shear strength tests of seven different thicknesses of HDPE geomembrane were carried out under different inflation time and pressure conditions. The test results show that the weld shear strength increases with the increasing geomembrane thickness under the same inflation time (3min or 10min) or the same test inflation pressure (0.1MPa or 0.2MPa). Additionally, the trend of all test curves is similar. The hot-welding method shows good stability in weld shear strength of different thicknesses of HDPE geomembrane. The shear strength values of GWSs of the same thickness under different inflation pressures and inflation times are similar. During the shearing process of the welds, the weakened area of the material at the joint between the edge of the weld and the geomembrane base material is most likely to be destroyed. The corresponding test results can provide reference for GWS inspection and related engineering.
Experimental and Numerical Study on Impact Behavior of Welded Hollow Sphere Joint under Continuous Impact Load
Authors: Wu Chang , Huang Guiwu , Ding Jinwei 
Published: September 2019

Abstract
In order to analyse the influence of continuous impact load and the stiffness of the welded hollow sphere joints on the impact resistance of the welded hollow sphere joints and verify the reliability of the generalized finite element software ANSYS/LS-DYNA precise modeling analysis of impact problems, two sets of the welded hollow sphere joints models with diameters of 80mm and 100mm were designed. The experimental results of three deformation stages (elastic, elastic-plastic and plastic deformation stages) in 18 working conditions of the two groups of models were analyzed. From the deformation mode, the acceleration and displacement of the sphere joint, the strain of the model member and the finite element simulation results, it is found that the test results and the finite element simulation are highly consistent. At the same time, the results show that the higher the stiffness of the welded hollow sphere joints, the better impact resistance of the joints. The continuity of the load has a great weakening effect on the impact resistance of the elastic-plastic and plastic deformation stages of the joints.
Study on Compressive Performance and Safety Assessment of Stone Masonry Structure in Tibet
Authors: Teng Dong-yu , Na Yang 
Published: September 2019

Abstract
Tibetan stone masonry is different from common masonry structure. However, currently, few studies on its structural characteristics and mechanical properties are conducted. This paper summarizes the materials, composition and masonry methods of Tibetan stone masonry, and analyzes its structural characteristics. A uniaxial compression test on the small specimens built in the laboratory and the full-scale wall specimens on the site is conducted to explore the damage mechanism of the Tibetan stone masonry. Based on the compression performance of Tibetan stone masonry, this paper proposes the factor set, weight coefficient, and rating criteria of the safety assessment of the Tibetan stone masonry components by using the fuzzy comprehensive evaluation and analytic hierarchy method. The evaluation method of the safety status of components is also put forward, which is validated by the test results.
The Assessment of The Integrated Structural Flood Control System in The Jingjiang Reach of The Yangtze River on Mitigating a Catastrophic Flood
Authors: Xu Xingya , Zhang Liming , Xu Zhaoming 
Published: September 2019

Abstract
In order to mitigate the flood disaster, an integrated structural flood control system, mainly incorporating levees, reservoirs, and flood diversion and detention zones, has been established in the JingJiang Reach of the Yangtze River by the efforts of Chinese government after several decades. The flood control effect of the integrated structural flood control system on mitigating the most catastrophic flood in history record which did occur in 1870 was assessed. According to the results, the used storage for flood control of the Three Gorges Reservoir is 18.4 billion m3 and the used storage for flood control of the other upstream reservoirs is 9.3 billion m3. The used flood storage of the Jingjiang Flood Diversion Zone is 5.4 billion m3 and the highest water level at Shashi Station is 45.00m. It shows that the flood control safety in the Jingjiang Reach is ensured to reach the achievement that controlling the highest water level at Shashi Station no more than 45.00m in the flood of 1870 to avoid the likely catastrophic flood disaster in the Jianghan plain and Dongting Lake plain along the Jingjiang Reach.
Safety Assessment Technology of Concrete Gravity Dams
Authors: Zhang Jiahong , Li You , Li Xiulin 
Published: September 2019

Abstract
Most reservoir dams in China were built before the 80s of last century, the issue of long-term security had become increasingly prominent. In recent years, with the “high dam, large reservoir, long water diversion” water conservancy project overall construction, safety assessment of some major water conservancy projects will become a major problem for a long time. Taking some gravity dam as an example, this paper introduced and summarized the safety assessment technology of concrete gravity dam, which would provide reference for safety evaluation and technical development of concrete dam in the future.
Research on the Model Test of the Debris Landslide’s Evolution Process in Tailings Reservoir
Authors: Qi Qinglan , Zhang Liting , Wang Xiaogang , Zhang Shaoxiong , Wu Yongqing 
Published: September 2019

Abstract
Based on the actual tailings reservoir project, a model test study on the evolution pattern of dam-breaking debris landslide is carried out. According to the similarity criterion of water flow and mud-sand movement, coal dust satisfying the similar relationship is selected as model sand. By analyzing the dam-breaking debris landslide’s range, propulsion speed, submerged depth distribution and particle deposition characteristics, the movement pattern of the landslide is obtained. In the short time after the dam break, the submergence range and advancing speed of the debris landslide increase rapidly. During the propulsion process, due to the increase of the debris landslide in the downstream of the valley, the debris landslide is diffused and the energy consumption during the flow is made. The advancing speed decrease until the landslide stops; The final submerged depth distribution of the dam breach has obvious randomness and non-uniformity, which is mainly related to the downstream terrain; According to the particle size grading analysis of the soil sample at the characteristic location, the further away from the dam toe, the finer particle content in the debris landslide.
Seismic damage analysis and reinforcement measure research for earth dams after a strong earthquake
Authors: Yang Baoquan , Ma Zhifa , Guo Xuyuan , Chen Yuan , Zhang Lin , Chen Jianye 
Published: September 2019

Abstract
At present, there are more than 98,000 reservoirs and dams in China. Most of these projects are earth dams. As unexpected disasters and events occur frequently, emergency response problems facing reservoirs and dams are increasingly prominent. Especially during a strong earthquake, the dangerous problems of these dams will be more serious, which is a serious threat to people’s lives and property downstream. Therefore, the seismic damages and the measures of reinforcement need to be studied. Basic data of 379 reservoirs were at high-risk or at dam-break risk, as well as the damage situations of medium and small earth dams damaged in the Wenchuan earthquake, are collected and presented in this paper. Several main failure modes of earth dams during the earthquake are analyzed and summarized. For practical engineering, some reinforcement measures for the typical failure mode of an earth dam are also proposed. The Wenjiajiao earth dam, a typical medium reservoir in the high-risk category, located in Cangxi County, Sichuan Province, is selected as the analysis example. The dam safety and seismic stability are calculated and analyzed by the finite element software program ANSYS. The results indicate that the biggest permanent deformation caused by the earthquake occurred in the dam crest; the maximum deformation is mainly a downward subsidence of 21.8 cm. As the thickness of the dam top part decreases, the dynamic displacement and vibration velocity of the dam crest increases. This calculation is consistent with the actual situation where the parapet wall of a dam crest was seriously incline and the upper slope collapsed and cracked. The research results can provide a reference for the danger control and reinforcement of similar earthquake damaged reservoirs.
Nonlinear seismic finite element modeling method for super long span column tower cable-stayed bridge
Authors: Cheng Leike 
Published: September 2019

Abstract
This project takes Wuhu Yangtze River Highway Second Bridge as an engineering example. In view of the structural and seismic characteristics of the new structure such as the super-long-span sub-limb column tower cable-stayed bridge and the oblique damping system, the partial precision modeling is applied to the seismic vulnerable components such as sub-limb column tower and pier on the basis of the seismic finite element model of the space bar system. In addition, the correct and reasonable finite element simulations of the important components and seismic construction measures such as cables and oblique dampers, are carried out by adopting the elements and constitutive relationships suitable for structural seismic analysis. Meanwhile, the material nonlinearity and geometric nonlinearity of super-long span bridges can be considered and nonlinear seismic finite element model of super-long-span column cable-stayed bridges is established.
Influence of Seismic Relative Wavelength on Strain Transfer Rate of Cross-section of Underground Structure
Authors: Zhou Yubao , Shi Tao 
Published: September 2019

Abstract
The seismic response of underground structures in nonlinear foundations was analyzed by using FLAC 3D software, and the effect of relative wavelength on the transverse strain transfer rate of structures is studied. The variation processes of the strain transfer rate can be divided into three distinct phases. In the first stage where the relative wavelength raises from 0.2 to 1.0, the strain transfer rate increases almost linearly with it; while in the second stage where the relative wavelength increases from1.0 to 2.0, the growth trend is slowing down. And the strain transfer rate almost keeps a constant value during the last phase, in which stage the uniform strain field of soil can be used to analyze the strain transfer rate. According to the influence of relative wavelength and relative stiffness on the strain transfer rate, the calculation formula of the strain transfer rate is summarized.
Study on influence of dam foundation damage on seismic safety of gravity dam under combined action of main shock and aftershock
Authors: Zhang Liaojun , Zhai Yafei , Chen Dongsheng , Cui Xiao 
Published: September 2019

Abstract
The existing seismic design codes for hydraulic structures have not yet required to consider the impact of strong aftershocks on the secondary damage caused by the dam. However, the actual earthquake damage indicates that the impact of strong aftershocks cannot be ignored. In order to study the seismic safety of concrete gravity dam subjected to strong earthquakes, this paper constructs a constitutive model that reasonably reflects the dynamic damage evolution process of dam concrete based on damage mechanics theory. According to the similarity of concrete and rock material, the concrete damage model is extended to the rock mass material. Based on this, taking the gravity dam as an example, the overall damage mechanics model of the dam body and the dam foundation is established. According to the characteristics of the dam site and the characteristics of ground motion, the artificial seismic wave with time-frequency non-stationary characteristics is synthesized considering the attenuation law of ground motion duration and intensity envelope function. The effects of main shock and strong aftershock on the whole damage of gravity dam are studied. The results show that the strong aftershock after the main shock has different cumulative effects on the overall damage and plastic strain of the gravity dam. The gravity dam will further expand in the damaged area when subjected to strong aftershocks. The cumulative effect of the aftershock on the damage and plastic strain of the foundation is more significant than that of the dam. Therefore, it is necessary to consider the plastic damage of the dam and the dam foundation in the seismic analysis of the dam.
Analysis of dynamic characteristics and seismic performance for Shengshousi Pagoda
Authors: Cui Xiaoling , Fang Fei , Lu Junlong 
Published: September 2019

Abstract
To study the dynamic characteristics and seismic performance of the Shengshousi Pagoda, the present status preserved of the pagoda’s structure was investigated on site, and the numerical computation model was established based on the parameters determined by calculated value of the natural vibration frequency of the structure. The responses of acceleration, displacement, story drift and stress were analyzed under three-way seismic wave. The seismic performance of pagoda structure was evaluated according to the calculation results of displacement and stress, and the failure criterion of pagoda materials. The results indicate that the natural frequencies in the east-west are close to that in north-south. The response laws of acceleration, displacement and stress are similar under three-way seismic wave of 8-degree fortification earthquake. Under the frequent earthquakes, the structure of pagoda does not suffer from compression damage; the tensile damage area is located at the bottom floor. Under the fortification and rare earthquakes, significant compression damage area is located at lower floors of the ancient pagoda, the stress concentration occurs around the part of opening, and significant tensile damage occurs.
Study on the Rule of Concrete Corrosion in Harsh Environment
Authors: Zhang Liming , Li Jia , Yu Hongfa , Zhan Qinpeng 
Published: September 2019

Abstract
The surface corrosion of 3 type concrete beams in hostile environment is researched by measuring concrete beams surface corrosion content, and the effect of test condition, concrete strength and corrosion time on concrete beams surface corrosion is analyzed. The result show that corrosion time is positively related to corrosion time; the beginning peeling time is longer with the increasing of concrete compressive strength; the capacity of concrete anti-stripping is increased with the increasing of concrete compressive strength. The formula of predication concrete beams surface stripping is set up by use of test data, which can be present in predicating concrete service life.
Properties of concrete containing fly ash and temperature control measures used during construction
Authors: Yu Xinkai , Li Jinyang 
Published: September 2019

Abstract
In recent years, fly ash cement has been applied in engineering with the continuous application of concrete admixtures. Although we have been using fly ash concrete and have done a lot of experimental research, but the understanding of its thermophysical properties was not complete, and further research was needed. This paper presented results of a study into important fundamental thermal and physical properties of both fly ash mortar and fly ash concrete. Different replacement percentage of OPC by FA ranging from 0 to 60% by mass were devised. Increasing fly ash content was found to delay the initial setting time and final setting times, decrease both compressive and flexural strengths and reduce hydration heat. It also can effectively reduce the hydration heat evolution of cement-fly ash binder. The adiabatic temperature rise of cement fly ash material in engineering can be estimated by reduction coefficient k. In fly ash concrete tests, thermal properties, including thermal diffusivity, conductivity, specific heat, ultimate tensile strain and static elasticity modulus were also measured and reported. There also appeared the relationship between compressive strength and flexural strength showed similar linear change with the replacement rate of fly ash rising from 30% to 60%. Most importantly, pipe cooling tests of fly ash concrete were carried out and from the perspective of temperature control of mass concrete, dynamic pipe cooling measures were investigated.