Finite element analysis of steep excavation slope failure by CFS theory  

作　　者：Huihong Cheng Huai Zhang Bojing Zhu Yaolin Shi 

机构地区：[1]Key Laboratory of Computational Geodynamics,Chinese Academy of Sciences,Beijing 100049,China [2]College of Earth Sciences,Graduate University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Earthquake Science》2012年第2期177-185,共9页地震学报（英文版）

基　　金：supported by Sinoprob-Deep Exploration Program in China sponsored by Ministry of Land and Resources of the People’s Republic of China (No.0819011A90);National Natural Science Foundation of China (No.D0408/4097409)

摘　　要：The distribution of Coulomb failure stress （CFS） change in the steep excavation slope is calculated by finite element method in this paper, and the failure mechanics under different conditions have been investigated. Comparing the CFSs before and after the slope excavation （stress loading and unloading processes）, the dangerous internal zone and the most likely failure external area are attained. Given the shear cracks on the top surface while tensile stress or cracks along the toe of the slope, we analyze the high cutting-angle steep slope in Kaixian county of the Three Gorges Reservoir region. We bring forward that the peak value of CFS after excavation can reach to the order of 0.1 MPa, which is greatly higher than that of before. Our preliminary results are useful for optimizing the reinforcement structure during the steep slope stabilization engineering.The distribution of Coulomb failure stress （CFS） change in the steep excavation slope is calculated by finite element method in this paper, and the failure mechanics under different conditions have been investigated. Comparing the CFSs before and after the slope excavation （stress loading and unloading processes）, the dangerous internal zone and the most likely failure external area are attained. Given the shear cracks on the top surface while tensile stress or cracks along the toe of the slope, we analyze the high cutting-angle steep slope in Kaixian county of the Three Gorges Reservoir region. We bring forward that the peak value of CFS after excavation can reach to the order of 0.1 MPa, which is greatly higher than that of before. Our preliminary results are useful for optimizing the reinforcement structure during the steep slope stabilization engineering.

关 键 词：Coulomb failure stress stabilization and failure evaluation steep slope excavation 

分 类 号：P315.1[天文地球—地震学]