Geomechanics and Engineering

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Pseudo-static stability analysis of wedges based on the nonlinear Barton-Bandis failure criterion

  • Zhao, Lianheng (School of Civil Engineering, Central South University) ;
  • Jiao, Kangfu (School of Civil Engineering, Central South University) ;
  • Zuo, Shi (School of Civil Engineering, Central South University) ;
  • Yu, Chenghao (School of Civil Engineering, Central South University) ;
  • Tang, Gaopeng (School of Civil Engineering, Central South University)
  • Received : 2018.11.26
  • Accepted : 2020.01.28
  • Published : 2020.02.25
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Abstract

This paper investigates the stability of a three-dimensional (3D) wedge under the pseudo-static action of an earthquake based on the nonlinear Barton-Bandis (B-B) failure criterion. The influences of the mechanical parameters of the discontinuity surface, the geometric parameters of the wedge and the pseudo-static parameters of the earthquake on the stability of the wedge are analyzed, as well as the sensitivity of these parameters. Moreover, a stereographic projection is used to evaluate the influence of pseudo-static direction on instability mode. The parametric analyses show that the stability coefficient and the instability mode of the wedge depend on the mechanical parameter of the rock mass, the geometric form of the wedge and the pseudo-static state of the earthquake. The friction angle of the rock φb, the roughness coefficient of the structure surface JRC and the two angles related to strikes of the joints θ1 and θ2 are sensitive to stability. Furthermore, the sensitivity of wedge height h, the compressive strength of the rock at the fracture surface JCS and the slope angle α to the stability are insignificant.

Keywords

Acknowledgement

Supported by : National Natural Science Foundation of China, Guizhou Provincial Department of Transportation Foundation, Guizhou Provincial Science and Technology Agency

This study was financially supported by the National Natural Science Foundation of China (Nos.51478477), Guizhou Provincial Department of Transportation Foundation (No. 2017122058 & No.2018123040), Guizhou Provincial Science and Technology Agency – Key Project of Technology Supporting Plan (No. [2018]2815). All financial supports are greatly appreciated.

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