基于结构面抗剪强度演化的块体动力稳定性分析

传统块体理论仅针对块体的静力稳定性分析，而未涉及到动力稳定分析。因此，借用Newmark法累积滑移量的概念，基于块体理论对定位块体在地震历时作用下的动力稳定性进行了研究，提出了以块体累积滑动位移和动安全系数两个指标共同评价块体动力稳定性。提出一种接触面识别及面积计算算法，它考虑了接触面积变化对块体稳定的不利影响，也可用于块体滑动的大变形分析，考虑了块体滑动过程中结构面抗剪强度的演化，可对复杂的凸形块体及凹形块体进行静、动力稳定性分析。将其应用于三峡升船机乘船箱左侧边坡的块体稳定分析中，结果显示块体在强震作用下发生了一段距离的滑动，但震后仍可保持稳定

Dynamic stability analysis of located block based on shear strength evolution of structural plane

The traditional block theory is just used to analyze the static stability of the block, while not concerned with the dynamic stability analysis. Based on block theory, the located block’s dynamic stability under the action of earthquake is studied by utilizing the concept of accumulated slippage of Newmark method. Several important results are obtained. ① By using accumulated sliding displacement and dynamic safety factor commonly to evaluate dynamic stability of the block. ② A contact area identification and area computation algorithm, considering the adverse influence on the block stability caused by the variation of contact area and can do large displacement analysis during block’s sliding. ③ The shear strength evolution of structural plane is considered during the earthquake. ④ It can be used to do static-dynamic analysis to the complicated convex and concave blocks. At last it is applied to analyze the stability of the left slope of shiplift boat box in Three Gorges Project. The results show that the block slides for a distance in the process of the severe earthquake, but it still keeps stable after the earthquake.