基于非线性规划法的滑动面抗剪强度参数优化

Optimization of shear strength parameter of the sliding surfaces based on nonlinear programming

实际工程中,由于土质的不均匀性、试验条件限制、取样和运输过程产生扰动等因素的制约,使得岩土抗剪强度参数的试验值与实际相差太大。为了取得可靠的计算参数,有必要对滑动带土的抗剪强度参数C,φ进行优化,本文根据滑坡的变形发展阶段确定了合理的稳定系数后,利用Microsoft Excel非线性规划求解器的既约梯度法,对边坡的抗剪强度参数进行了优化,得到了可靠的滑坡稳定系数和抗剪强度参数。

The soil shear strength parameter which is obtained from experiments,is different with the actual value in engineering design because of the restriction of soil inhomogeneity,testing conditions,sampling and disturbances arising during transport,etc. In order to get reliable calculation parameters,it is necessary to analyze and optimize the shear strength C and φ within sliding zone soils. According to determining the reasonable deformation stage of landslide in this paper,the shear strength parameters of sliding zone were optimized by using the method of reduced gradient method in Microsoft Excel nonlinear programming solver.