深基坑支护体系的坑角效应分析  

Analysis of Pit Angle Effect of Deep Foundation Pit Support System

作　　者：赵芳甫 ZHAO Fangfu(China Gezhouba Group No.3 Engineering Co.,Ltd.,Xi′an 710000,China)

机构地区：[1]中国葛洲坝集团第三工程有限公司,西安710000

出　　处：《交通科技》2023年第6期47-51,共5页Transportation Science & Technology

摘　　要：目前在深大基坑设计中,常忽略实际开挖过程中基坑变形的空间效应。为研究深大基坑支护体系的变形特性,文中以西安某城市综合体深大基坑为工程背景,基于PLAXIS 3D有限元软件,从围护墙侧向位移、墙后地表横向沉降和纵向沉降3个方面出发,研究深大基坑工程桩锚支护体系的坑角效应,并采用平面应变比(PSR)加以描述,通过对PSR值的分析,得出基坑在不同条件下受到坑角效应作用的程度。结果表明,随开挖深度的增加,深基坑支护结构变形存在显著的坑角效应,越靠近基坑中部位置,其坑角效应越弱。In the current design of deep and large foundation pits,the spatial effect of foundation pit deformation during actual excavation is often neglected.In order to study the deformation characteristics of the deep and large foundation pit support system,taking a deep and large foundation pit of an urban complex in Xi′an as the engineering background,based on PLAXIS 3D finite element software,the pit angle effect of the pile-anchor support system of the deep and large foundation pit project is investigated from three aspects:the lateral displacement of the enclosing wall,the transverse settlement of the ground surface behind the wall,and the longitudinal settlement,and is described by using the plane strain ratio(PSR).In addition,the degree of pit angle effect on the foundation pit is derived through the analysis of the PSR value.The results show that with the increase of excavation depth,there is a significant pit angle effect on the deformation of the deep foundation pit support structure.The closer it is to the central position of the foundation pit,the weaker its pit angle effect.

关 键 词：基坑 PLAXIS 坑角效应 

分 类 号：U445.55[建筑科学—桥梁与隧道工程] TU753[交通运输工程—道路与铁道工程]