Stability analysis of rock slopes with double weak interlayers based on upper bound limit analysis
Stability of rock slope with weak interlayers is controlled by weak interlayers and rock mass.There are obvious differences in geological model,failure mode and stability analysis method between rock slope with multiple and single weak interlayers.With the employment of associated flow rule for the upper interlayer and non-associated flow rule for the rest,the upper bound method is used to construct sliding mechanism of rock slope with double weak interlayers based on traditional plastic theory and the generalized plastic theory and,thus the calculation method of stability coefficient is proposed in this paper.The minimum value of stability coefficient is solved and corresponding failure mechanism of the slope in the limit equilibrium state is drawn based on the sequential quadratic optimization algorithm through an example from an engineering.Calculation is compared with the results of 3DEC discrete element numerical analysis.The results show that the larger the inclination angle of double weak interlayers is,the closer the sliding surface is to the top of the slope,and the more unstable the slope is.The theoretical method presented in this paper is in good agreement with the numerical results to verify accuracy of proposed method.
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