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Failure Mechanism of Abutment Slope Sliding in Meizoseismal Area

LIU Rong-can~(1,2),TANG Hong-mei~1,JIANG Jin-chi~2,LIU Jun~2 (1.Institute of Geotechnical Engineering,Chongqing Jiaotong University,Chongqing 400074,China; 2.Institute of Geology & Mineral Resources of Chongqing,Chongqing 400042,China)  
Aiming at the phenomenon a large number of abutment slopes have sliding failure in Wenchuan Earthquake,a theoretic study of abutment slope sliding under seismic effect is carried out.According to Mises flow rule,the abutment slope sliding velocity as well as its angle between sliding lines under earthquake are obtained.In that case,the energy consumption of the work force acting on the slope and the plastic flow is obtained.And then,on the basis of principle that the work done by external forces is equivalent to internal energy consumption,the maximum slope seismic active earth pressure and the corresponding angle of sliding surface are finally got.Integrating the energy dissipation theory and the dynamic response to slope slide,the safety assessment of slope sliding under seismic effect is carried out.
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