考虑张拉-剪切渐进破坏的边坡矢量和法研究

针对边坡渐进破坏过程中岩土体强度参数不断劣化现象，采用应变软化模型代替传统的理想塑性模型，提出一种考虑张拉?剪切渐进破坏的边坡矢量和分析方法。从安全系数表达式与最危险滑动面搜索两方面进行研究，首先基于滑动和力的矢量特性，改进矢量和法滑动趋势与安全系数表达式，进而基于改进自适应遗传算法搜索边坡最危险滑动面。算例表明，采用应变软化模型时的矢量和法安全系数与最危险滑动面形态具有动态变化与调整的特性。该基于张拉-剪切应变软化模型的计算方法进一步扩展了边坡矢量和分析法。

Study on the vector sum method of slope considering tensile-shear progressive failure

In view of the continuous deterioration of strength parameters of rock and soil during the progressive failure of slope, the strain-softening model, instead of the traditional ideal plastic model, was applied. An improved vector sum algorithm, which considers the tensile-shear progressive failure, was proposed in this paper. Both the safety factor expression and the method of searching the most dangerous sliding surface were studied. Based on vector characteristics of sliding and force, the sliding trend and safety factor expression of vector sum were improved. Moreover, the most dangerous sliding surface of slope was searched based on the improved adaptive genetic algorithm. Results of several case studies show that, when the strain-softening model was adopted, the safety factor based on the definition of vector sum and the most dangerous sliding surface shape have dynamic changes and adjustment characteristics. The proposed algorithm in this paper, which is based on the tensile-shear strain softening model, expands analytic methods of slope vector sum to a certain extent.