基于统一强度理论的土石坝边坡稳定分析遗传算法

将非线性统一强度理论应用于土石坝边坡稳定分析中，考虑坝体各应力分量包括中间主应力对土质材料强度的影响，以区别于传统土石坝稳定分析中仅考虑剪切和拉伸极限强度的极限平衡法。提出了一个土石坝边坡稳定优化分析模型，并采用最优化遗传算法对土石坝边坡进行断裂面优化搜索。研究表明，统一强度理论中反映中间主应力效应系数值变化对坝体稳定安全系数有显著影响。利用遗传算法对土石坝边坡稳定进行分析时，不必事先假定滑裂面的形状，根据土石坝非线性统一强度理论的剪裂破坏准则进行滑裂面搜索。针对常规最优化方法容易陷入局部最优解的缺陷，基于MATLAB遗传算法工具箱对土石坝边坡稳定性进行分析，分析结果表明，统一强度理论结合遗传算法能克服常规最优化方法在寻优过程中一些缺陷，计算结果更自然合理。

Slope stability analysis of earth-rock dams based on unified strength criterion by genetic algorithm

Based on the nonlinear unified strength criterion, an optimal analytic model for slope stability analysis of earth-rock dam is proposed; and the sliding surface is searched on the basis of shear-crack failure criteria in nonlinear unified strength theory without assumption of the shape of sliding surface in advance. As we all know that the Mohr-Coulomb law is widely applied to analyzing slope stability of earth-rock dam. In this paper, linear and nonlinear unified strength theory is applied to the stability analysis of slope of earth-rock dam. The research results show that the stability factor of slope can be increased when considering the effect of nonlinear failure criterion and intermediate principal stress. The application of genetic algorithm to slope stability analysis shows that the genetic algorithm can consequently overcome the weakness of simply relapsing into local optimal solutions brought on by traditional optimal algorithm. Numerical results are given to illustrate the genetic algorithm to be more compatible and reasonable than most of optimal algorithms.