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基于拟静力稳定性分析模型,建立了地震作用下土钉支护边坡永久位移计算方法。提出了永久位移由地震作用过程中位移和震后位移两部分组成。在求解平均加速度时,将边坡考虑为弹性体对Newmark有限滑动位移法的刚性假定进行改进。采用遗传算法动态寻优实现边坡地震过程中永久位移计算。运用功能原理建立地震作用后永久位移计算模型并求解。根据土钉柔性结构特性,对土钉震后随土体滑移机理提出褶皱台阶变形来计算土钉的滑移摩阻做功。给出基于边坡永久位移控制的土钉支护结构动态设计理念及程序步骤,并用实例进行计算及数值验证,结果表明震后位移量与地震作用过程中位移的比值很大,因此震后位移不能忽略。
Based on the quasi-static stability analysis model, a method of calculating the permanent displacement of soil nailing slope under earthquake action is established. It is proposed that the permanent displacement consists of the displacement and the post-earthquake displacement in the course of the earthquake action. In solving the average acceleration, the slope is considered as an elastomer to improve the rigid assumption of the Newmark finite sliding displacement method. DYNAMIC OPTIMIZATION OF GENETIC ALGORITHM TO CALCULATE PERMANENT DISPLACEMENT IN Slope EARTHQUAKE. By using the functional principle, a permanent displacement calculation model after earthquake action is established and solved. According to the characteristics of flexible structure of soil nail, the paper put forward the deformation of folds step with soil slip mechanism to calculate the slip friction of soil nail. The dynamic design concept and program steps of soil nailing support structure based on permanent displacement control of slope are given. The calculation and numerical verification are carried out with examples. The results show that the ratio of post-earthquake displacement to earthquake displacement is large, Can not be ignored.