Three-dimensional slope stability analysis based on strength theory of unsaturated soil
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Abstract:
In the slope stability analysis, the strength theory of saturated soil was commonly adopted in three-dimensional slope stability analysis, but in fact the effect of matric suction in unsaturated zone could not be ignored, so it is necessary to adopt the strength theory of unsaturated soil for slope stability analysis. Therefore, based on the strength theory of unsaturated soil and thought of three-dimensional simplified Bishop’s method, a new formula of safety factor was deduced to evaluate slope stability and corresponding program was developed. Finally, the slope stability of Sima reach in Yangtze river was analyzed using the proposed method, the results indicated that the safety factor was increased based on strength theory of unsaturated soil compared to strength theory of saturated soil and it was more reasonable to evaluate slope stability by the proposed method.
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