非对称基坑内支撑水平刚度的迭代计算方法  

An Iterative Calculation Method for Horizontal Stiffness of Internal Supports in an Asymmetric Excavation Pit

作　　者：黄骥征 Huang Gizheng

机构地区：[1]上海瓴云土木工程咨询有限公司

出　　处：《隧道与轨道交通》2023年第3期13-16,59,60,共6页Tunnel and Rail Transit

摘　　要：现有计算公式不能满足非对称基坑内支撑水平刚度系数的计算,且数值模拟分析过于费时、费力。为满足快节奏下非对称基坑设计工作需要,探索了一种非对称基坑内支撑水平刚度系数的迭代计算方法。该方法的思路为:将荷载较大剖面计算得到的内支撑轴力作为荷载施加到荷载较小剖面;对荷载较小剖面建立弹性地基梁模型,并取得支护结构位移;由荷载较小剖面支撑点的刚度和支撑自身刚度计算取得荷载较大剖面支撑点的刚度;将求得的刚度作为支撑水平刚度系数代入深基坑设计软件进行迭代计算。该方法可以较简便地计算出非对称基坑的内支撑水平刚度系数。The existing formula cannot meet the requirement for the calculation of the horizontal stiffness coefficients of internal supports in an asymmetric excavation pit,and the numerical simulation analysis is too time-consuming and labour-intensive.In order to meet the fast design requirement of an asymmetric excavation pit,an iterative method is explored for the calculation of the horizontal stiffness coefficients of internal supports of an asymmetric excavation pit.The idea of this method is as follows:the axial force of a support calculated from the profle with a larger load is applied to the profile with a smaller load as a load;an elastic foundation beam model is established for the smaller load profile,and the displacement of the retaining structure is obtained;the stiffness of the supporting point at the profile with a larger load is calculated based upon the stifness of the supporting point at the profle with a smaller load and the stffness of the support itself,and the stffness obtained from the previous step is taken as the horizontal supporting stiffness coefficient and is substituted into the deep excavation design software for iterative calculation.This method can calculate the horizontal stiffness coeficients of internal supports of an asymmetric excavation pit more easily.

关 键 词：基坑工程 内支撑体系 非对称 支撑水平刚度系数 迭代计算 

分 类 号：TU753[建筑科学—建筑技术科学]