One of the most exciting features of RS2 is finite element slope stability using the Shear Strength Reduction (SSR) method. This option is fully automated and can be used with either Mohr-Coulomb or Hoek-Brown strength parameters. With a single mouse click, you can run the SSR analysis and determine the critical strength reduction factor (safety factor) of a slope.
The SSR method has many advantages over the traditional limit equilibrium methods of slope stability. For example, SSR analysis does not require any assumptions about the shape or location of the failure surface. The SSR method will automatically determine the most critical failure mode and the corresponding safety factor.
For more information about SSR analysis with RS2 see the Shear Strength Reduction Overview topic in the RS2 Help system.
See each of the following aspects of the SSR analysis below:
You can plot SRF versus Maximum Total Displacement with the Graph Shear Strength Reduction option. This graph represents the essential results of the SSR analysis, and illustrates the iteration process used to determine the critical SRF. The critical SRF is the maximum value of SRF at which convergence is achieved for the finite element analysis. If the SRF is higher than the critical value the model is unstable (i.e. the finite element analysis does not converge within the specified number of iterations).
For example, in a dam or embankment model, you may wish to analyze the stability of each side of the model independently.
The SSR Search Area option can be useful in other situations. For example, in a benched slope or open pit mine model, you may wish to analyze individual benches or regions of the slope. An SSR Search Area is easily defined by simply clicking and drawing a window over any portion of the model. Only the selected area of the model will be considered for the SSR analysis. Regions outside of the search area will be considered stable.
For more information see the Import Slide File topic in the RS2 Help system.