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A Study on the Influencing Factors of Joint Rock Slope Stability under Earthquake Activity

TENG Guang-liang1,2,4,CHEN Yong-ming1,2,3,SHI Yu-cheng1,2,3, SUN Chong-shao1,2,LU Yu-xia1,2,3,QIANG Zheng-yang1,2(1.Key Laboratory of Loess Earthquake Engineering,Gansu Earthquake Administration,CEA,Lanzhou,Gansu 730000,China; 2.Lanzhou Institute of Seismology,CEA,Lanzhou,Gansu 730000,China; 3.Geotechnical Disaster Prevention Engineering Technology Research Center of Gansu Province,Lanzhou,Gansu 730000,China; 4.Gansu Institute of Architectural Design & Research,Lanzhou,Gansu 730030,China)  
Disaster survey results of the Wenchuan earthquake show that seismic landslides mainly develop within thick-bedded or massive rock,in which local intensity is relatively large and joints are obvious.Although seismic landslides differ markedly from those induced by rainfall and other factors,this topic has not drawn sufficient attention.Moreover,numerical analysis methods of finite element and finite difference,both based on the assumption of continuous media and small deformation,are used in previous studies of slope stability.However,some limitations exist in dynamic analysis of large deformations of rock slope due to a large number of interfaces of discontinuity. To overcome those problems,the dynamic response of joint rock slope in this thesis is simulated by means of the discrete element numerical simulation,particularly deformation characteristics,failure mechanism,and influencing factors of slope stability.Here,a rock slope containing two groups of joints is used as the research object.In addition,discrete element numerical simulation is conducted,and actual earthquake records are input to simulate a large number of cases.The influencing factors of the joint rock slope stability are respectively explored under various conditions of slope height,seismic intensity,slope angle,and joint angle.Topographic amplification effects are observed from both acceleration and velocity of the monitoring points of the slope.Joint rock slope stability is reduced with slope height,slope angle,and seismic intensity.In addition,the stability of the rock slope that contains two groups of joints is complex and is influenced by other factors including joint inclination,slope angle,the tendency of joints,and the angle between two group joints.The regions of tension failure are gradually extended to the shear zone and eventually lead to slope instability and failure,compounded by tensile and shear failure.This study provides a reference for evaluation of the rock slope and joints stability under seismic loading in mountainous areas.
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