Affect of shear strength criteria selection in probabilistic rock slope stability analyses

2007 ◽  
pp. 951-957
Author(s):  
H D√ºzg√ºn ◽  
R Bhasin
Keyword(s):  
Shear Strength ◽  
Slope Stability ◽  
Rock Slope ◽  
Rock Slope Stability ◽  
Strength Criteria ◽  
Stability Analyses

scholarly journals Influence of Discontinuity Inclination on the Shear Strength of Mont Terri Opalinus Claystones

2016 ◽  
Author(s):  
Ildikó Buocz ◽  
Nikoletta Rozgonyi-Boissinot ◽  
Ákos Török
Keyword(s):  
Shear Strength ◽  
Slope Stability ◽  
Rock Slope ◽  
Rock Sample ◽  
Shear Plane ◽  
Strength Test ◽  
Rock Slope Stability ◽  
Shear Strength Test ◽  
Rock Discontinuity ◽  
Mont Terri

The shear strength of rocks along discontinuities has the highestinfluence on rock slope stability; therefore, its accuratedetermination is crucial. This paper presents a potential solutionfor the 3D surface detection of the rock discontinuity surfacesby using photogrammetric methods (ShapeMetriX3D),from which one of the most important shear strength influencingparameters can be determined and analyzed. From thedetermination of the angle enclosed by the plane of the samplesurface and the shear plane in the direction of shear, besidesthe effect of the upslope/downslope shearing further analysiscan be carried out in case the examined rock sample containsbedding planes or foliation. The magnitude of the influence onthe shear strength for both cases is demonstrated on existingdirect shear strength test measurements that were carried outon over-consolidated Mont Terri Opalinus Claystones from theRock Laboratory of Mont Terri in Switzerland.

Three-dimensional numerical analysis for rock slope stability using shear strength reduction method

2014 ◽  
Vol 51 (2) ◽  
pp. 164-172 ◽  
Author(s):  
Jiayi Shen ◽  
Murat Karakus
Keyword(s):  
Shear Strength ◽  
Rock Mass ◽  
Slope Stability ◽  
Rock Slope ◽  
Three Dimensional ◽  
Strength Reduction ◽  
Rock Slope Stability ◽  
Convergence Criterion ◽  
Slope Modeling ◽  
Shear Strength Reduction

Existing numerical modeling of three-dimensional (3D) slopes is performed mainly by using the shear strength reduction (SSR) technique based on the linear Mohr–Coulomb (MC) criterion, whereas the nonlinear failure criterion for rock slope stability is seldom used in slope modeling. However, it is known that rock mass strength is a nonlinear stress function and that, therefore, the linear MC criterion does not agree with the rock mass failure envelope very well. In this research, a nonlinear SSR technique is proposed that can use the Hoek–Brown (HB) criterion to represent the nonlinear behavior of a rock mass in the FLAC3D program to analyze 3D slope stability. Extensive case studies are carried out to investigate the influence of the convergence criterion and boundary conditions on the 3D slope modeling. Results show that the convergence criterion used in the 3D model plays an important role, not only in terms of calculation of the factor of safety (FOS), but also in terms of the shape of the failure surface. The case studies also demonstrate that the value of the FOS for a given slope will be significantly influenced by the boundary condition when the slope angle is less than 50°.

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