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Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)  2013, Vol. 14 Issue (2): 101-109    DOI: 10.1631/jzus.A1200121
Civil Engineering     
Progressive failure analysis of slope with strain-softening behaviour based on strength reduction method
Ke Zhang, Ping Cao, Rui Bao
School of Resources and Safety Engineering, Central South University, Changsha 410083, China; Kuming Prospecting Design Institute of China Nonferrous Metals Industry, Kunming 650051, China
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Abstract  Based on the strength reduction method and strain-softening model, a method for progressive failure analysis of strain-softening slopes was presented in this paper. The mutation is more pronounced in strain-softening analysis, and the mutation of displacement at slope crest was taken as critical failure criterion. An engineering example was provided to demonstrate the validity of the present method. This method was applied to a cut slope in an industry site. The results are as follows: (1) The factor of safety and the critical slip surface obtained by the present method are between those by peak and residual strength. The analysis with peak strength would lead to non-conservative results, but that with residual strength tends to be overly conservative. (2) The thickness of the shear zone considering strain-softening behaviour is narrower than that with non-softening analysis. (3) The failure of slope is the process of the initiation, propagation and connection of potential failure surface. The strength parameters are mobilized to a non-uniform degree while progressive failure occurs in the slope. (4) The factor of safety increases with the increase of residual shear strain threshold and elastic modulus. The failure mode of slope changes from shallow slip to deep slip. Poisson’s ratio and dilation angle have little effect on the results.

Key wordsShear strength reduction      Strain-softening      Peak strength      Residual strength      Progressive failure analysis     
Received: 04 August 2012      Published: 31 January 2013
CLC:  TU432  
Cite this article:

Ke Zhang, Ping Cao, Rui Bao. Progressive failure analysis of slope with strain-softening behaviour based on strength reduction method. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2013, 14(2): 101-109.

URL:

http://www.zjujournals.com/xueshu/zjus-a/10.1631/jzus.A1200121     OR     http://www.zjujournals.com/xueshu/zjus-a/Y2013/V14/I2/101

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