Slope Stability Analysis Under Combined Failure Criteria

Abstract

Strength reduction finite element method (SRFEM) has been widely used to analyze the slope stability. Strength Reduction Factor (SRF) is yielded as the slope Factor Of Safety (FOS) when a running-though shear failure zone comes into being, in which the Plastic Element EQuivalent strain (PEEQ) is employed as the judgment of shear failure initiation in this paper. Moreover, the filed variable is set as same as SRF along the solution processing, FOS can be directly determined as the cor-responding value of field variable when the shear failure zone goes through. Three typical slopes with varying foot gradients of 26.6, 45 and 78.7 in degree are analyzed and fantastic results have been yielded, well agreeing with the Spencer’s results, when the linear Mohr-coulomb failure criterion is employed. However, during the solution process, tensile failure zone initiates at the slope top while the plastic failure zone initiates at the slope toe and this indicates that the failure mode of slope is combined. The results show that the combined failure zone with plastic failure and tensile failure appears much earlier than the unique plastic failure zone, which indicates that the traditional analytic method and SRFEM based on the unique linear Mohr-coulomb plasticity criteria overestimated the slope stability factor.

Geomechanical characteristics and failure analysis of the limestone slope at Sahastradhara–Chamasari road Dehradun Uttarakhand India

“…The slope stability is generally determined in terms of the factor of safety in the M-C criteria. The material properties like Young's modulus, Poisson's ratio, cohesive strength, and angle of internal friction are the basic inputs for the determination of slope stability problems using the M-C criteria [9][10]. This criterion gives an outlook of the mode of failure and the post-failure analysis of the slope.…”

“…The FEM method utilizes the equilibrium equation and strain compatibility for the determination of the slope failure. This method uses M-C criteria to determine the mode of failure and the factor of safety of the slope [9][10][11]. M-C criteria were used to evaluate slope stability in the Handlebar Hill open-pit mine located at Mt.…”

Analysis of Slope Stability of Canals' Embankments under Traffic Load

“…Su et al [8] studied the field variable was set as same as SRF along the solution processing, FOS can be directly determined as the corresponding value of field variable when the shear failure zone goes through.…”