Simplified Probabilistic Slope Stability Design Charts for Cohesive and c-ϕ Soils
August 14, 2014
Recently, SVSLOPE® was used to develop a series of design charts for simple slopes combining quantitative estimates of the conventional factor of safety with matching estimates of the probability of failure considering random values of cohesive and frictional shear strength components having lognormal distributions. Two series of design charts were developed.
Monte Carlo simulations were run utilizing the conventional Simplified Bishop’s Method of analysis coupled with the probabilistic circular slip slope stability analysis option in SVSLOPE®. The results were used by the researchers to develop design charts for cohesive and cohesive-frictional soil slopes. Design chart accuracy was confirmed by comparing chart values with closed-form solutions where available, and results from other software packages. The charts may be used by geotechnical engineers to make preliminary estimates of the probability of failure of simple slopes without the need of first running Monte Carlo simulations.
The analysis required the utilization of SVSLOPE® for many thousands of model runs with a wide range of model input values. The analysis results compared closely to the results from other software packages. The successful completion of this research project demonstrates the stability and accuracy of the SVSLOPE® software package.
A recent journal paper that describes this work and presents the probabilistic slope stability design charts can be found at: http://dx.doi.org/10.1139/cgj-2013-0385