边坡滑带抗剪强度参数的严格反分析方法

摘要

提出一种边坡滑带抗剪强度参数的严格反演方法.采用运动单元法求解安全系数和临界滑动面以克服极限平衡法的不足.研究抗剪强度参数组合与稳定状况间的理论关系.结果表明,c/tanφ控制滑动面位置、F/tanφ和F/c.随着c/tan φ增大,滑动面位置向坡内移动.基于上述研究结果,根据某个剖面的已知安全系数和滑动面位置,可快速反算滑带抗剪强度参数.将提出的方法应用于3个计算实例,用于证明本方法的有效性.反分析所得的抗剪强度参数与理论精确解和实验结果很接近.%A rigorous back analysis of shear strength parameters of landslide slip was presented.Kinematical element method was adopted to determine factor of safety and critical failure surface,which overcomes the disadvantage of limit equilibrium method.The theoretical relationship between the combination of shear strength parameters and stability state was studied.The results show that the location of critical slip surface,F/tan φand F/c depend only on the value of c/tan O.The failure surface moves towards the inside of slope as c/tan φ increases.According to the information involving factor of safety and critical failure surface in a specific cross-section,strength parameters can be back calculated based on the above findings.Three examples were given for demonstrating the validity of the present method.The shear strength parameters obtained by back analysis are almost consistent with their correct solutions or test results.