不规则深基坑阳角效应的工程处治评价与分析  

Evaluation and analysis on engineering treatment of external angle effect of irregular deep foundation pit

作　　者：董淑海 张雪东 沈宇鹏[3] 左瑞芳[3] DONG Shu-hai;ZHANG Xue-dong;SHEN Yu-peng;ZUO Rui-fang(CCCC Third Harbor Consultants Co., Ltd., Shanghai 200032, China;CCCC Railway Consultants Group Co., Ltd., Beijing 100088, China;School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China)

机构地区：[1]中交第三航务工程勘察设计院有限公司,上海200032 [2]中交铁道设计研究总院有限公司,北京100088 [3]北京交通大学土木建筑工程学院,北京100044

出　　处：《中国港湾建设》2017年第9期11-15,共5页China Harbour Engineering

摘　　要：基于基坑实测数据,借助ABAQUS有限元三维模拟软件,对影响基坑阳角效应的桩体刚度、阳角角度、阳角凸出长度、开挖深度和锚头拉力等因素进行分析。在考虑桩体和土之间接触面无厚度、小滑移,桩底与土体采用Tie绑定连接,锚杆预应力采用等效降温法施加的条件下,开展了对深基坑阳角工程处治效果研究的工作。结果表明,在合理配筋的前提下,适当增加桩体的刚度,选取合适的锚杆力,可以减少基坑周边土体的位移,有利于基坑施工;桩体弯矩和桩顶位移随阳角角度的增大而减小,随阳角凸出长度及基坑开挖深度的增大而增大。研究结果可为类似工程的施工安全提供保障。ABAQUS finite element3D simulation software was used to analyze the factors affecting external angle effect of afoundation pit based on the measured data,such as pile stiffness,size of external angle,protruding length of external angle,depth of excavation and anchor force.Little thickness,small slip and tie binding between pile and soil,and anchor prestressapplied by the equivalent cooling method was considered in this paper,and then the treatment effect study of a deep foundationpit project was carried out.The results show that under the premise of reasonable steel bars,increasing the stiffness of the pilebody and selecting the appropriate anchor force can reduce the displacement of the soil around the foundation pit,which isbeneficial to the construction of the foundation pit.The bending moment of the pile body and displacement of the pile topdecreased with the size of external angle increase,and increased with protruding length of external angle and depth ofexcavation increase gradually.

关 键 词：深基坑 锚杆支护体系 阳角效应 有限元模拟 

分 类 号：U655.54[交通运输工程—港口、海岸及近海工程] TU472[交通运输工程—船舶与海洋工程]