›› 2018, Vol. 39 ›› Issue (11): 4109-4116.doi: 10.16285/j.rsm.2017.0295

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Bench-shape slope stability analysis based on strain softening model

DENG Qin1, TANG Hua1, WANG Dong-ying1, 2, QIN Yu-qiao1, 2, WU Zhen-jun1   

  1. 1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China; 2. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2017-02-23 Online:2018-11-10 Published:2018-11-15
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (51608518), the Science and Technology Projects of the Transportation Department of Yunnan Province([2016]163 1(3)), and the Fund for National Engineering Laboratory for Surface Transportation Weather Impacts Prevention (NELBP201601).

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Abstract: In addition to the critical slip surface, the potential slip surface of each step and other slip surfaces which do not meet the specification requirements of bench-shape slope also need to be considered. Based on strain softening theory, the development of shear strain in bench-shape slope is simulated by FLAC3D, and the multi-slip surfaces have been obtained. Meanwhile, the strength parameters and evolution of safety factor of slip surface in strain softening process have been analyzed by using vector sum method. Examples of double-step slope and complex multi-step slope show that: the critical and secondary slip surfaces can be obtained; the strength parameters in the slip surfaces gradually change from peak strength to residual strength as the strain softening progresses. However, the speed is different. With the development of strain softening process, the safety factor of all slip surfaces reduces gradually, and finally tends to a constant value.

Key words: bench-shape slope, strain softening model, vector sum method

CLC Number: 

  • TU 457

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