Rock and Soil Mechanics ›› 2021, Vol. 42 ›› Issue (2): 547-557.doi: 10.16285/j.rsm.2020.0435

• Geotechnical Engineering • Previous Articles     Next Articles

A multiparameter non-proportional shear strength reduction method for slope stability analysis based on energy evolution theory

LU Feng1, 2, QIU Wen-ge1, 2   

  1. 1. Key Laboratory of Transportation Tunnel Engineering of the Ministry of Education, Southwest Jiaotong University, Chengdu, Sichuan 610031, China; 2. School of Civil Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, China
  • Received:2020-04-16 Revised:2020-11-05 Online:2021-02-10 Published:2021-02-09
  • Supported by:
    This work was supported by the National Key R&D Program of China (2017YFC0806000) and the National Natural Science Foundation of China (51991395, U1434206, 51678497).

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Abstract: In the failure process of slopes, the contribution of different mechanical or material parameters to the stability is different and dynamic. In the context of shear strength reduction method (SRM) for stability analysis, it is of great significance to determine the factor of safety (FOS) by considering non-proportional reduction for these different mechanical or material parameters. This study firstly examines the mechanism of energy evolution in the process of slope failure. Then, the contribution of different mechanical parameters to dissipated energy evolution is weighted in conducting SRM, based on which we proposed a new method to calculate the FOS with multiparameter non-proportional reduction of shear strength parameters. This method can reflect the characteristic of FOS following the whole reduction path of different shear strength parameters. Subsequently, the proposed method is verified by examples. Finally, the influence of the reduction step and reduction path of the non-proportional reduction factors on the calculated FOS results is discussed.

Key words: energy evolution, shear strength reduction (SRM), factor of safety (FOS), degradation, reduction path

CLC Number: 

  • TU 457
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