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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。
The nonlinear unified strength theory is applied to the slope stability analysis of earth-rock dam. The influences of various stress components of the dam, including the intermediate principal stress, on the strength of soil material are taken into account to distinguish only the shear and tensile limits in the stability analysis of the traditional earth- The ultimate balance of strength method. An analysis model of slope stability optimization for earth-rock dam is proposed. An optimized genetic algorithm is used to optimize the fracture surface of the earth-rock dam. The results show that the change of the coefficient of effect of the intermediate principal stress in the unified strength theory has a significant effect on the stability and safety factor of the dam. When the stability of rockfill dam is analyzed by using genetic algorithm, it is not necessary to presuppose the shape of the sliding surface, and to search the sliding surface according to the shear failure criterion of the nonlinear unified strength theory of earth-rock dam. Aiming at the defect that the conventional optimization method is easy to fall into the local optimal solution, the stability of the rockfill dam slope is analyzed based on MATLAB genetic algorithm toolbox. The results show that the unified strength theory and genetic algorithm can overcome the conventional optimization method in the optimization process In some defects, the calculation result is more natural and reasonable.