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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。
The traditional block theory is only for the static stability analysis of the block, but does not involve the dynamic stability analysis. Therefore, by using the concept of the cumulative slip of the Newmark method, the dynamic stability of the positioning block under the action of the earthquake duration is studied based on the block theory. The two indexes of the cumulative sliding displacement and the dynamic safety factor are proposed to be evaluated together Block dynamic stability. A new algorithm of contact surface recognition and area calculation is proposed, which considers the adverse effect of the change of contact area on block stability. It can also be used for large deformation analysis of block sliding. Considering the evolution of shear strength of structural surface during the sliding of block , Can be complex convex block and concave block static and dynamic stability analysis. Applying this method to the stability analysis of the block on the left side slope of the ship lift box of the Three Gorges Ship Lift, the result shows that the block has some distance sliding under the action of strong earthquake, but it can still be stable after the earthquake.