A quantitative display index that considers tensile failure to predict the full sliding surface of a landslide
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In slope stability evaluation, it is common that a potential tensile sliding surface is not accurately positioned. In this paper, the strength reduction method considering shear and tensile failure with a strain-softening model is adopted to simulate the deterioration of the strength parameters of geomaterials during failure. Based on the initial stress method, a new quantitative display index of the full sliding surface is proposed. This method was applied to the stability analysis of a heterogeneous slope and a homogeneous slope. The results show that the plastic zone determined with the strain-softening model is much smaller than that determined with the Mohr-Coulomb model, and the difference is 34–40%. The safety factor obtained without considering tensile failure is 3.1% larger than that obtained considering tensile failure. The index can be used to quantitatively display the shear failure zone and tensile failure zone of a sliding surface.
KeywordsStrength reduction method Tensile failure Strain-softening model Sliding surface index Initial stress method
67/90 Cyan?>Funding information
This research was supported by the National Key R&D Program of China (Grant No. 2017YFC1501301), the National Natural Science Foundation of China (Grant Nos. 41521002 and 41572283), the Funding of Science and Technology Office of Sichuan Province (Grant No. 2017TD0018), and the research fund of the State Key Laboratory of Geohazard Prevention and Geoenvironment Protection (Grant No. SKLGP2018Z011).
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