基于试验的岩坡滑动面力学参数反演

由于岩体强度试验得到的力学参数与实际情况偏差较大,利用试验所得岩体结构面强度参数计算得到的岩坡稳定性系数往往与实际情况有一定误差。利用概率论中的极大似然估计法,结合室内试验和边坡安全系数计算方法,对岩坡滑动面的参数进行反演。结果表明,该反演结果精确性较高,说明所用方法更为可靠,所得结果可以为边坡的稳定性评价和支护设计提供合理的参数。

Back Analysis of Mechanical Parameters of Slip Surfaces in Rock Slopes Based on Experiments

The mechanical parameters directly inferred from the results of experiments on rock strengths usually deviate to some extents from the real values. The factor of safety of a rock slope thus calculated using these mechanicals parameters is not able to reflect the actual stability of the slope. In this paper, the maximum likelihood estimation is used for the back analysis of the mechanical parameters of slip surfaces in rock slopes based on laboratory experiments and stability computation. The result shows that the probabilistic back analysis is more precise than from the regressive back analysis. This demonstrates that the present method can be reliably applied to slope stability analyses and design of rock slope supporting system.