基坑开挖对邻近地铁变形的影响分析  

The Influence of foundation pit excavation on adjacent metro deformation

作　　者：孔令荣[1] 崔永高[1] 隋海波[1] 

机构地区：[1]上海岩土工程勘察设计研究院有限公司,上海200438

出　　处：《工程勘察》2010年第6期15-20,共6页Geotechnical Investigation & Surveying

摘　　要：本文通过基坑开挖对邻近地铁隧道影响的原型案例分析,归纳基坑开挖引起邻近隧道沉降、水平位移及收敛变形的主要因素,研究结果表明:邻近隧道的基坑开挖对隧道的沉降和水平位移均产生较大的影响,隧道产生的变形在空间上表现为斜向坑底的位移;隧道横断面的收敛情况表现为,隧道呈现出横鸭蛋形。引起隧道变形的主要因素有基坑与隧道相对距离(水平距离和垂直距离)、开挖的时空效应等。其中基坑与隧道的相对距离对隧道的变形影响较大,当基坑与隧道的水平距离在4m以内时,隧道产生的水平位移、沉降均较大。Based on the original scale model of foundation pit excavation on adjacent metro deformation,the main factors on the adjacent tunnel settlement,horizontal displacement and converged deformation are analyzed.The results show that it＇s the foundation pit excavation on adjacent metro that has a great influence on the tunnel settlement and horizontal displacement,the tunnel deformation shows the inclined to bottom of pit foundation;the convergence of tunnel shows ellipse that the horizontal axis is longer than the vertical axis.The main factors on the adjacent tunnel deformation include the relative displacement between foundation pit and tunnel（including horizontal and vertical displacement）,time-space effect and so on,of which the relative displacement has the most influence on the deformation of the tunnel,when the displacement between foundation pit and tunnel is less than 4 meters,the horizontal displacement and settlement is greater.

关 键 词：隧道 沉降 水平位移 基坑 

分 类 号：TU433[建筑科学—岩土工程]