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《Chinese Journal of Rock Mechanics and Engineering》 2017-S2
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The shaking table test of the instability sliding of loess slope under the coupling effects of earthquake and rainfall

WANG Lanmin;PU Xiaowu;WU Zhijian;SUN Junjie;WANG Ping;CHAI Shaofeng;XU Shunhua;DENG Jin;Key Laboratory of Loess Earthquake Engineering,Lanzhou Institute of Seismology,CEA;Geotechnical Disaster Prevention Engineering Technology Research Center of Gansu Province,Lanzhou Institute of Seismology,CEA;  
To explore dynamic response features,deformation evolution process and failure mechanism of loess slope under the coupled effect of earthquake and rainfall,two model tests of loess slope with 100 mm rainfall and natural state were carried out to compare and analyze change features of macroscopical deformation and related physical quantities such as acceleration,pore pressure and soil pressure,etc.The results indicate that natural vibration frequency in loess slope model after rainfall is reduced as well as damping ratio is increased and amplification effects of seismic oscillation are enhanced.Under effect of strong shock,the soil in the top of the slope are seismically settled and liquified and liquified soil would slip along the slope under follow-up seismic oscillation.In line with changes in macroscopical deformation,pore pressure and soil pressure in the slope model,the failure process can be divided into four phases,namely elastic deformation phase,rapid increase phase of residual deformation,liquification slipping phase and creeping phase.Macroscopical deformation,pore pressure and soil pressure of the soil in different phases are with their own characteristics.
【Fund】: 国家自然科学基金资助项目(51478444 41472297 51578518)~~
【CateGory Index】: TU444
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