NUMERICAL MODELING OF THE EVOLUTION OF SLOPE FAILURE USING THE LIMIT STRAIN CRITERION AND DYNAMIC STRENGTH REDUCTION METHOD
LI Shigui1, HUANG Da2,3, SHI Lin3, WANG Junjie4
1. Guizhou Expressway Group Co., Ltd., Guiyang 550001;
2. School of Civil and Transportation Engineering, Hebei University of Technology, Tianjin 300401;
3. Key Laboratory of New Technology for Construction of China in Mountainous Area, Ministry of Education, Chongqing University, Chongqing 400045;
4. Key Laboratory for Hydraulic and Waterway Engineering of Ministry of Education, Chongqing Jiaotong University, Chongqing 400074
Geo-materials usually possess the characteristics of limit strain, which can be obtained by laboratory or numerical method. Shear failure is one of the main failure mode of the materials in slope, thus the limit strain of slope material can be used as a failure criteria. In fact, during the failure process of slope, the strength parameters of geo-materials in slope do not degrade simultaneously. Instead, they usually progressively damage until global failure. In this study, regarding slope failure we proposed a dynamic strength reduction method based on the limit shear strain criterion. In this method, we only reduce the strength parameters of elements whose shear strain is beyond the limit value. The reduction process will continue until the global slope failure associated with the formation of whole sliding surface whose limit shear strains beyond the limit value. A numerical modeling of an actual slope using this method is conducted. Results show that the simulated slope failure pattern and deformation are in good agreement with the in-situ observed failure phenomenon and monitoring data, respectively. This suggests that the proposed numerical method has a promising application prospect in studying the progressive failure and stability of slopes.
LI Shigui,HUANG Da,SHI Lin et al. NUMERICAL MODELING OF THE EVOLUTION OF SLOPE FAILURE USING THE LIMIT STRAIN CRITERION AND DYNAMIC STRENGTH REDUCTION METHOD[J]. Journal of Engineering Geology, 2018, 26(5): 1227-1236.