深基坑三排桩支护结构被动区力学特性研究  

Research on Mechanical Properties of Passive Earth Pressure of Treble-row-piles Wall Retaining and Protection Structure for Deep Excavations

作　　者：董必昌[1] 王雅新 陈世龙 巨斌斌 杨涛[1] DONG Bichang;WANG Yaxin;CHEN Shilong;JU Binbin;YANG Tao(School of Transportation and Logistics Engineering,Wuhan University of Technology,Wuhan 430063,China)

机构地区：[1]武汉理工大学交通与物流工程学院,武汉430063

出　　处：《武汉理工大学学报（交通科学与工程版）》2024年第2期347-352,共6页Journal of Wuhan University of Technology（Transportation Science & Engineering）

摘　　要：文中以某船坞工程采用的新型三排桩支护结构作为依托工程,结合地质勘察报告,运用有限元分析法和弹性支点法对其典型断面的桩前被动土压力计算公式参数进行了反演分析.通过改变土体参数、开挖深度,以及前排桩桩径等影响因素,对比分析计算得到桩前土压力有限元计算值与弹性支点法计算值的比值变化规律.结果表明:被动土压力合力的模型计算结果E_(p模型)与理论公式计算结果E_(p理论)的比值约为0.4~0.7.在此基础上,对三排桩支护结构桩前土压力的弹性支点法公式进行了改进,为修正系数提出了合理建议,改进后公式为:p_(s)=(0.4~0.7)(k_(s)v+p_(s0)),并研究了各系数的分布规律.Based on a new type of three-row pile supporting structure used in a dock project,combined with the geological survey report,the parameters of the formula for calculating the passive earth pressure in front of the pile of its typical section were analyzed by finite element analysis and elastic fulcrum method.By changing soil parameters,excavation depth,pile diameter of front row piles and other influencing factors,the ratio variation law of soil pressure before piles calculated by finite element method and elastic fulcrum method was obtained by comparative analysis and calculation.The results show that the ratio of the model calculation results of the resultant passive earth pressure to the theoretical formula calculation results is about 0.4~0.7.On this basis,the elastic fulcrum method formula of soil pressure in front of three rows of piles supporting structure is improved,and reasonable suggestions are put forward for correcting the coefficient.The improved formula is:p_(s)=(0.4~0.7)(k_(s)v+p_(s0)),and the distribution law of the coefficient is studied.

关 键 词：基坑支护 三排桩 弹性支点法 有限元计算 

分 类 号：TU473.1[建筑科学—结构工程]