Journal of Jilin University(Earth Science Edition) ›› 2015, Vol. 45 ›› Issue (2): 533-540.doi: 10.13278/j.cnki.jjuese.201502201

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Analysis on Slope Stability Based on Local Factor of Safety

Ma Jianquan1, Wang Nianqin1, Zhang Xinshe2   

  1. 1. College of Geology and Environment, Xi'an University of Science and Technology, Xi'an 710054, China;
    2. Xi'an Center of Geological Survey, CGS, Xi'an 710054, China
  • Received:2014-07-02 Published:2015-03-26

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Abstract:

The local factor of safety (LFS) formula was derived based on the Mohr-Coulomb strength theory and the concept of LFS was redefined. The stress distribution of the slope was calculated by using Geostudio software, combined with MATLAB for the calculation of LFS for each point in the slope model to outline the stable and unstable regions for analysis of the slope stability. Comparison of the results by the local factor of safety method(LFSM) and the limit equilibrium method (LEM) shows that for a vertical slope, both LFSM and LEM predict that it is unstable, whereas the LFS delineated a zone of potential failure behind the vertical face and near the toe. For a 60° slope, the LEM predicts that the factor of safety is greater than 1.00, whereas the LFSM delineates a zone of potential failure near the toe. For a 45° slope, both LFSM and LEM predict its stability. Further analysis shows that LFSM can analyze the slope stability without needing to identify or assume any potential failure surfaces, the stress concentration problem can be taken into consideration for slope stability analysis. The LFSM displays the results by unstable regions, while LEM shows the factor of safety. Sensitivity analysis of stress and geotechnical parameters in LFSM and LEM were conducted and the results revealed that in comparison to LEM, LFSM is more sensitive to the variation of geotechnical parameters. There exist boundary points of cohesion and internal friction angle that play important roles in determining the failure shape (partial deformation or damage, whole compression deformation or damage) of slope.

Key words: local factor of safety, limit equilibrium method, slope stability

CLC Number: 

  • P642

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