隧道竖井施工对邻近管线沉降影响的研究  

Research on the Influence of Shaft Construction on the Settlement of Adjacent Pipelines

作　　者：田亮[1] 单仁亮[1] 李润军[1] 陈慧娴[1] 张苗[1] 

机构地区：[1]中国矿业大学(北京)力学与建筑工程学院,北京100083

出　　处：《地下空间与工程学报》2015年第1期143-148,155,共7页Chinese Journal of Underground Space and Engineering

基　　金：中央高校基本科研业务费专项基金项目资助(No.2010YL09)

摘　　要：地铁施工不可避免的要穿越大量既有地下管线,引起周边土体变形,导致管线产生附加应力和变形,对管线的安全使用具有潜在威胁。以北京地铁7号线湾达区间施工竖井为背景,利用FLAC数值分析结合现场实测的方法,探讨了钢支撑、开挖深度、管径、埋深对邻近地埋管线的影响。研究发现:钢支撑对周边环境起着有效的控制作用;随着管径的增大,埋深的增加,管线沉降值呈减小趋势;竖井开挖至一定深度后,随着开挖深度的增加沉降变化明显。并针对竖井施工土体薄弱部位,提出了加固措施,对竖井施工有一定的指导意义。It is unavoidable that metro construction would pass across existing underground pipelines. Deformation of surrounding soils would happen leading to additional stress and deformation of pipelines,which is a potential threat to the safe operation of the pipelines. This paper is based on the construction of the shaft in Wanda Interval of Beijing Metro Line No. 7. The influence of steel bracing,cutting depth,pipeline diameter and buried depth on adjacent pipelines was studied by FLAC3 D combined with field measurement. The research showed that the steel bracing played an effective part in controlling the settlement of surroundings. With increase of pipe diameter and buried depth,the settlement of pipelines would decrease. The settlement increased obviously as the excavation was over certain excavated depth. Several measures to reinforce the weak part of soils at constructing shaft were put forward. The research would be quite conductive to later shaft construction.

关 键 词：竖井施工 邻近管线 沉降 数值分析 

分 类 号：U231.3[交通运输工程—道路与铁道工程]