【作者】 倪万魁； 刘东燕； 张永兴；

【Author】 NI Wankui~(①②) LIU Dongyan~①ZHANG Yongxing~①(①College of civil Engineering,Chongqing University,Chongqing 400045)(②School of Geological Engineering and Surveying Engineering,Chang’an University,Xi’an 710054)

【机构】 重庆大学土木工程学院； 长安大学地质工程与测绘工程学院；

【摘要】 采用非线性弹性和弹塑性有限元法模拟了黄土地区某高速公路黄土高边坡在不同降雨条件和地震条件下坡体应力场变化及变形破坏规律,结果认为:随降雨入渗量的增加,边坡土体的含水量逐渐增大,其塑性破坏域不断扩大;地震作用使坡体最大主应力和剪应力明显增大,应力集中带的范围扩大,坡体内塑性区迅速扩大;黄土高边坡的破坏方式为滑塌型,其变形破坏过程为坡体蠕动→后缘拉裂→滑带在坡体中下部形成并向两侧扩展→剪出口形成→坡体突滑。这些规律的认识对黄土高边坡稳定性评价和设计方案确定具有重要意义。更多还原

【Abstract】 There are hearly 150 high loess slopes(height over 30 m) cutting in highway construction in the northwest of China.As effective engineering techniques have not been developed for designing high loess slopes in harmony with the geotechnical environment,60 slope failures happened due to unsuitable design and subsequent heavy rains.The purpose of this paper is to illustrate the application of a numerical finite element method for some findings common in the deformation and failure of high loess slope subjected to rainfall and earthquake conditions.According to the investigations on all failed slopes,the type of high loess slope failures is always slumping both landslide and collapse.The results for nonlinear - elastic and elatic-plastic numerical analysis of slope show that a developing process of this slumping is as follows:the creep of slope body leads to the tensional cracks produced on the upper edge of slope,and to the sliding zone formed in the middle of lower slope and gradually expanded,at last to slope collapse.In addition,both the shear failure zone largely expanded by rainfall increasing and the shear stress greatly raised due to seismic force may quicken the loess slope failure.更多还原