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Dynamic Response of Soil Slope under Near-fault Gound Motions

SONG Jian1,2,GAO Guang-yun1,2,CHEN Qing-sheng3,ZHAO Hong1,2(1.Department of Geotechnical Engineering,Tongji University,Shanghai 200092,China; 2.Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education,Tongji University,Shanghai 200092, China;3.Shanghai Construction Group,Shanghai 200050,China)  
On the basis of the distribution characteristics of landslides along the fault in the Wenchuan earthquake,the finite difference FLAC program was applied to analyze the dynamic response of the soil slope by using the nonlinear time-history method.Near-fault ground motions with the forward directivity effect,fling-step effect,and non-pulse were selected as seismic inputs.The results show that the potential damages to slopes caused by pulse-like ground motions are significantly greater than the cases with non-pulse ground motions,and the dynamic responses of slopes caused by fling-step pulses are slightly larger than those associated with forward directivity pulses.An amplification effect of the peak horizontal acceleration is apparent in the vertical direction of slope,and the amplification coefficient increases under forward directivity pulses and decreases under flin-step pulses.Furthermore,the peak horizontal acceleration at the bottom of slope induced by fling-step ground motions is larger than that of forward directivity or non-pulse ground motions.
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