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International Conference on Information engineering and Computer Science (ICIECS)

作者： Shuai Yang Hong Wang Xiao-zhou Xia Hong Yuan Coll. of Civil & Transp. Eng. GDUT Guangzhou China Key Lab. of Disaster Forecast & Control in Eng. Inst. of Appl. Mech. Guangzhou China

This article has been retracted by the publisher.

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Damage evolution and acoustic emission character of coalrock under unloading condition

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Tumu Jianzhu yu Huanjing Gongcheng/Journal of Civil, Architectural and Environmental engineering 2009年第2期31卷 57-61页

作者： Liu, Bao-Xian Li, Dong-Kai Zhao, Bao-Yun School of Architecture and Civil Engineering Xihua University Chengdu 610039 China Key Lab. for the Exploitation of Southwestern Resources and the Environmental Disaster Control Eng. Chongqing University Chongqing 400030 China

The damage failure mechanisms of coalrock under unloading condition during deep mining is different from those under traditional loading condition, starting from the unloading condition position to study the dynamic disaster of coalrock has become a new direction in the disaster study. The rock mechanics electrohydraulic servo test system (MTS815) and acoustic emission system (8CHS PCI-2) are used to study the coalrock deformation damage and acoustic emission (AE) characteristics. The results show that the failure of coalrock under unloading condition exhibits strong brittleness and happens in sudden and is mostly of tensile-shear failure type. The evolution curve of cumulative ring-down count of acoustic emission can better reflect the coalrock unloading damage evolution process, and the whole unloading failure process can be divided into three stages: the stage of damage weakening, damage stably development stage and the stage of accelerated damage development. During the mining process the confining pressure of the coalrock is unloaded, the coalrock rapidly arrives at the third stage of the whole unloading failure process, and the damage is accumulated rapidly and the fracture failure of coalrok occurred suddenly, then follows the coalrock dynamic disaster.

关键词： disasters

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Safety evaluation of high-cutting slope along highway in mountainous area

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Tumu Jianzhu yu Huanjing Gongcheng/Journal of Civil, Architectural and Environmental engineering 2009年第3期31卷 66-71页

作者： Lin, Xiao-Song Chen, Hong-Kai Xu, Jiang Tang, Hong-Mei Cao, Wei-Wen Key Lab. for Exploitation of Southwestern Resources and Environmental Disaster Control Engineering Chongqing University Chongqing 400030 P. R China Institute of Geotechnical Engineering Chongqing Jiaotong University Chongqing 400074 P. R China

Slope safety stability is the bottleneck problem for the development of mountainous highway, especially high class highway in China, which results from greatness slopes along highway in mountainous area, complex geological environment and short forming age. The important degree arrangement of various indexes was carried out based on simple dependent function. And weighting system of indexes was modified with analytic hierarchy process and expert reliability. With indexes and weighting system, matter element extension model for high-cutting slope along highway in mountainous area was proposed by matter-element extension method. A case study was undertaken for K88+680 high-cutting slopes along Wushan-Wuxi road in Chongqing city based on the model. It was indicated that the safety grade is III and the slope is instable.

关键词： Slope stability

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Moving load identification using finite element method for complex structure

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Nanjing Hangkong Hangtian Daxue Xuebao/Journal of Nanjing University of Aeronautics and Astronautics 2008年第2期40卷 174-179页

作者： Qin, Yuantian Chen, Guoping Yu, Ling Zhang, Fang College of Aerospace Engineering Nanjing University of Aeronautics and Astronautics Nanjing 210016 China Key Lab. Disaster Forecast and Control in Engineering Jinan University Guangzhou 510632 China

A new moving load identification method is presented based on function fitting technology and finite element method. According to the linear relation of the load and the structure response, the fitting coefficients can be identified, then by these coefficients, the moving load can also be *** method can be applied to all complex structure with various boundary conditions. And it can also identify the varying-speed moving load. How to equal discrete node load to continious moving load is discussed. Numerical simulations and experimental results demonstrate the briefness, effectiveness and anti-interfered capacity of the method. Thus the method can identify the moving load for complex engineering structure.

关键词： Finite element method

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Theoretical model and numerical analysis on unsaturated expansive soil slope during digging and climate change courses (II)-numerical analysis

Theoretical model and numerical analysis on unsaturated expa...

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12th International Conference on Computer Methods and Advances in Geomechanics 2008

作者： Chen, Zheng-Han Lu, Zai-Hua Guo, Jianfeng Fang, Xiang-Wei Zhou, Hai-Qing Logistic Engineering University Chongqing China Key Lab. for the Exploitation of Southwest Resources Environment Disaster Control Engineering Ministry of Education Chongqing 1 China Navy University of Engineering Wuhan China

ISBN: (纸本)9781622761760

In order to investigate the sliding mechanism and process of expansive soil slope during digging and raining-evaporating courses, a FEM program named UESEPDC was designed based on the elasticity-plasticity-damage constitutive model and the elasticity-plasticity-damage consolidation model of unsaturated expansive soil proposed by the authors, and the numerical analysis on solid-liquid-gas tri-phases and multi-field couple problem was conducted for four stages: Raining and evaporating before digging;The moment at digging finishing;Three days after digging finishing;Multi- raining-evaporating cycles. The fields of stress, displacement, pore water pressure, pore air pressure, water content and suction in an expansive soil slope were obtained, and the pictures of crack damage evolution and plastic zone development in the same expansive soil slope for each analysis stage were shown. The research results clearly reveal the mechanism of expansive soil slope sliding progressively.

关键词： Numerical analysis

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engineering properties of stale waste from a landfill in Chongqing, P.R. China

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Chongqing Jianzhu Daxue Xuebao/Journal of Chongqing Jianzhu University 2008年第3期30卷 32-35+40页

作者： Zhao, Yu Li, Xiao-Hong Lu, Yi-Yu Kang, Yong College of Civil Engineering Chongqing University Chongqing 400030 China Key Lab. for the Exploitation of South West Resources and the Environmental Disaster Control Eng. Chongqing 400030 China

Stale waste is a type of soil which is different from other soil types. In order to study both the physical index and the engineering characteristics of stale waste, physico-mechanical tests were done for many groups of stale waste from one landfill in Chongqing, P. R. China that had been closed for over six years. Some basic physical indexes of the waste, such as the composition, water content, density and pore ratio, were obtained. The influence of the wastes' composition on these indexes is discussed in detail herein. Based on the performance of the triaxial stress-strain curves, a division of the curve into four stages is put forward. The influences of cement content, density, water content and age on the deformation behavior in the four stages are given. The data indicate that the old municipal solid lacks a strong structure and that the minimal stress σ3 is the main reason for the strength increase of stale waste. The influence of organic fiber and soil particle on the strength index (C,ψ) also is discussed.

关键词： engineering properties MSW (municipal solid waste) landfill Stale waste

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Fracture mechanics solution for control fissures in perilous rock under seepage stress

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Chongqing Jianzhu Daxue Xuebao/Journal of Chongqing Jianzhu University 2008年第5期30卷 77-80页

作者： Chen, Hong-Kai Zhang, Yi Institute of Geotechnical Engineering Chongqing Jiaotong University Chongqing 400074 China Key Lab. for the Exploitation of Southwestern Resources and Envir. Disaster Control Eng. Min. of Ed Chongqing University Chongqing 400044 China

Crack propagation of control fissures in perilous rock under loads is a key process in the failure of perilous rock. Based on the loading mechanism, the control fissures are classified into compression-shear and tension-shear types. By introducing a model of seepage stress, the calculating principle of the stress intensity factor and the propagation orientation of control fissure under seepage stress are put forward using fracture mechanics methods. Using Shoulishan perilous rock in the Wanzhou district of Chongqing, P.R. China, as an example, the calculated results show that there is an obvious increase of the stress intensity factor. The influence of hydrostatic pressure and hydrodynamic pressure also are analyzed.

关键词： control fissure Fracture mechanics Perilous rock Rock mechanics Seepage stress Stress intensity factor

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Influence on strength characteristic of pile-soil composite with different moisture content

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Hunan Daxue Xuebao/Journal of Hunan University Natural Sciences 2008年第SUPPL.期35卷 49-53页

作者： Liao, Hong-Jian Zhang, Xin-Shan Li, Zhen-Dong Key Lab. for Exploitation of Southwestern Resources and Environ. Disaster Control Eng. Chongqing 400044 China Dept. of Civil Engineering Xi'an Jiaotong Univ. Xi'an 710049 China China Northwest Building Design Research Institute Xi'an 710003 China

Based on the fact that the physical and mechanical parameters of soil surrounding the foundation pile will change due to compacting effect of the pile, a series of direct shear tests on composite of concrete specimen and soil with different moisture content are performed with an improved direct shear apparatus. The relations between shear stress and strain of the composite as well as the effect of soil moisture content on the strength characteristic of the composite are studied. Based on the theory of cavity expansion, the elastic-plastic stress and strain formulas of the soil surrounding the pile are derived. According to the laws of variation of strength index with moisture content, the effect of moisture content on the radius of the plastic zone and the stress state of soil surrounding the pile are analyzed, which can be referenced in the engineering practice.

关键词： Piles

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Modeling experiment on developing processes for debris flow on slope

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Hunan Daxue Xuebao/Journal of Hunan University Natural Sciences 2008年第SUPPL.期35卷 130-134页

作者： Chen, Hong-Kai Xian, Xue-Fu Tang, Hong-Mei Wang, Quan-Cai Zhang, Yu-Ping Key Lab. For Exploitation of Southwestern Resources and Environ. Disaster Control Eng. Chongqing Univ. Chongqing 400044 China Department of Geotechnical and Geological Engineering Chongqing Jiaotong Univ. Chongqing 400074 China Chengdu Institute of Mountain Hazard and Environment Chinese Academy of Sciences Chengdu 610041 China

Based on dynamic geomorphology, general developing model for debris flow on slope was put forward. Further, in views of scale similarity, model soils and pricipitation devices, one semi-quantitative-qualitative experiment model was established, meanwhile, the experiment schedule was clarified. Precipitation durations vary 140-300 minutes, and it belongs to the previous precipitation stage from beginning to 70 minutes, rainfall velocity is below 1.5 mm/min, while the intense precipitation stage after 115 minutes, rainfall velocity is controlled in 2.5-5.0 mm/min. Experimental results identify five stages for developing processes of debris flow on slope, i.e., soil strength attenuation after sorping water, soil creep deformation, local sliding, flow and deposit. Physical behaviours every stages are discussed in detail, and some necessary mechanical principles are suggested in future mechanical analyses for every stages.

关键词： Geomorphology

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Study on damages constitutive model of rocks based on lognormal distribution

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Journal of Coal Science & engineering(China) 2007年第4期13卷 430-433页

作者：李树春许江陶云奇唐晓军 Key lab. for the Exploitation of Southwestern Resources ＆ the Environmental Disaster Control Engineering Ministry of Education Chongqing University Chongqing 400044 China

The damage constitutive relation of entire rock failure process was established using the theory of representative volume element obeying the Iognormal distribution law, and the integrated damages constitutive model of rock under triaxial compression was established. Comparing with triaxial compression test result, it shows that this model correctly reflects the relationship of stress-strain. At the same time, according to the principle of the rock fatigue failure that conforms to completely the static entire process curve, a new method of establishing cyclic fatigue damage evolution equation was discussed, this method form is simple and the physics significance is clear, it may join preferably the damage relations of the rock static entire process curve.

关键词： constitutive model rock damage fatigue

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