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《Rock and Soil Mechanics》 2010-S2
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Stability analysis of high soil slope under complex stress state

MA Zong-yuan,IAO Hong-jian,QI Ying(Department of Civil Engineering,Xi'an Jiaotong University,Xi'an 710049,China)  
Based on the existing landslide field,a stability analysis of high slope along the loess plateau of Guanzhong Basin is presented.The format of explicit finite difference of twin shear unified elastoplastic constitutive model is developed which is based on the elastoplastic theory,non-associated flow rule and twin shear unified strength theory.According to the site surveys and laboratory tests,the terrain features before and after sliding and scale of the slope are analyzed;and the three-dimensional model is created from the sketch of terrain before the landslide event.With the influence of intermediate principal stress,stability analysis of high slope is processed with FLAC3D;ground water level variation and seepage flow are taken into account.The results show that the horizontal displacement at top of slope increases with the rising of ground water level with the consideration of intermediate principal stress.The result of no seepage flow calculation shows that the slope reaches a steady state under a certain displacement yielded on the top of slope.However,the displacement increases continually and then sudden failure may occur when the seepage flow is taken into account.This study may provide a reference for the research of failure mechanism of high soil slope.
【Fund】: 国家自然科学基金资助项目(No.50979087);; 三峡库区地质灾害教育部重点实验室基金资助项目(No.2008KDZ09)
【CateGory Index】: TU431
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