摘要
为探究地连墙施工对既有隧道变形影响,以武汉某基坑工程为例,分析地下连续墙施工过程中周边土体变形规律和既有结构变形响应特征,以为优化地连墙施工过程控制隧道变形提供指导。采用PLAXIS 2D软件,建立二维数值模型,研究地连墙开挖成槽和混凝土浇筑2个阶段引起的土体变形和隧道变形特征,分析不同泥浆重度下地层变形和既有隧道变形演化规律。结果表明,地下连续墙施工引起的地层变形受泥浆重度影响显著,泥浆重度较大时泥浆压力大于土体水平压力,引起周边土体向槽外变形。地下连续墙施工完成后引起的地层水平位移随泥浆重度增大而增大,既有隧道拱顶沉降随泥浆重度增加而显著减小。当泥浆重度从12 kN/m3增至14 kN/m3时,施工引起土体的最大水平位移从3.48 mm增长至22.04 mm,左线隧道拱顶沉降由5.54 mm减少至0.90 mm,右线隧道拱顶沉降由5.33 mm减少至0.84 mm。
To study the deformation law of existing tunnels during the construction of diaphragm wall,taking a foundation pit project in Wuhan city as an example,the deformation characteristics of the surrounding soil and existing structures during the construction of the diaphragm wall were studied,aiming at providing guidance for optimizing the construction process of diaphragm walls and controlling tunnel deformation.PLAXIS 2D software was used to establish a two-dimensional numerical model to study the soil deformation and tunnel deformation characteristics caused by two stages of the excavation of the diaphragm wall and the pouring of concrete.In addition,the evolution laws of stratum deformation and existing tunnel deformation under different mud densities were analyzed.The results show that the stratum deformation caused by the construction of the diaphragm wall is significantly affected by the slurry density.When the slurry density is large,the corresponding slurry pressure is greater than the horizontal stress of the soil,causing the surrounding soil to deform outward.After the construction of the diaphragm wall is completed,the horizontal displacement of the formation increases with the increase of slurry density,and the settlement of the existing tunnel vault decreases significantly with the increase of slurry density.When the slurry density increased from 12 kN/m 3 to 14 kN/m 3,the maximum horizontal displacement of the soil caused by construction increased from 3.48 mm to 22.04 mm,the settlement of the left tunnel vault decreased from 5.54 mm to 0.90 mm,and the settlement of the right tunnel vault decreased from 5.33 mm to 0.84 mm.
作者
吕延豪
栗晓龙
陈健
孙雪兵
娄英豪
LYU Yanhao;LI Xiaolong;CHEN Jian;SUN Xuebing;LOU Yinghao(China Railway Siyuan Survey and Design Group Co.,Ltd.,Wuhan 430063,China;State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071,China)
出处
《交通科技》
2024年第5期134-138,共5页
Transportation Science & Technology
基金
中铁第四勘察设计院集团有限公司科技研究开发计划项目(2022K113)资助。
关键词
地下连续墙
泥浆重度
既有隧道
数值分析
变形
diaphragm wall
slurry density
existing tunnel
numerical simulation
deformation
作者简介
第一作者:吕延豪(1979-),男,正高级工程师;通信作者:栗晓龙(1988-),男,硕士,高级工程师。
