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| Finite element analysis of steep excavation slope failure by CFS theory |
| Huihong Cheng1, 2, Huai Zhang1, 2, Bojing Zhu1, 2, Yaolin Shi1, 2 |
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 |
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Abstract 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.
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Received: 02 December 2011
Published: 10 April 2012
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| Fund:Sinoprob-Deep Exploration Program in China sponsored by Ministry of Land and Resources of the People’s Republic of China (No. 0819011A90) and National Natural Science Foundation of China (No. D0408/4097409) |
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Corresponding Authors:
Yaolin Shi
E-mail: chenghuihong@163.com
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