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Slope Stability and Mesh Fineness
Posted Mar 7, 2019, 2:56 AM EST Geomechanics, Mesh Version 5.3a 3 Replies
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I want to run slope stability analysis for a slope using COMSOL. The slope dimensions and the soil properties are obtained from an example discussed in the Griffiths and Lane’s paper. The FS in the mentioned paper and from the limit equilibrium method are obtained as 1.40 and 1.38, respectively. The issue is that the FS based on COMSOL results is highly dependent on mesh resolution. For direct solver, Constant Newton method, and quadratic triangle mesh with maximum element size of 4m and 0.2m, the FS is computed as 1.4, and 1.0 (finer mesh results in wrong FS). Could you please let me know why by using the finer mesh incorrect results are obtained? What solving method should be used for finer mesh? When the FS parameter is gradually increasing in this method, do the results (deformation, stress) of new FS depend on the results of previous FS? (i.e. is there any searching procedure with respect to strength reduction factor?)
The model is attached.
Thanks a lot in advance. Amin