摘要
为了研究基坑开挖对既有隧道及周边环境的影响,以上海某地铁车站基坑工程为背景,采用数值模拟的方法对开挖过程中地铁隧道的变形及周边地表沉降进行了研究,并与现场监测数据进行对比分析。计算分析结果表明:基坑开挖至坑底时邻近隧道的变形和地表沉降均达到最大值,数值模拟结果与实测数据基本一致,验证了模拟的正确性。距离基坑较近侧隧道的变形大于较远侧隧道的变形量,隧道变形总体表现为朝基坑开挖方向的“横鸭蛋”形状。基坑开挖引起的地表沉降总体呈漏斗状,中间大两边较小,最大值出现在距离坑边1.2~1.5倍基坑开挖深度的位置,基坑开挖对地表沉降的影响范围约为两倍基坑开挖深度。隧道的变形值和周边地表沉降均满足规范的要求,基坑开挖不会影响轨交1号线的正常安全运营。研究结果对类似基坑设计和安全施工具有一定的参考价值。
In order to study the influence of foundation pit excavation on the existing tunnel and surrounding environment,the deformation of subway tunnel and the surface subsidence during the excavation process were studied by numerical simulation method with the background of foundation pit project around a subway station in Shanghai,and were compared and analyzed with the field monitoring data.The calculation and analysis result shows that:the deformation of subway tunnel and the surface subsidence reach the maximum value when the foundation pit is excavated to the bottom.The results of the numerical simulation are basically consistent with the field monitoring data,which verify the correctness of the simulation.The deformation of the tunnel near the foundation pit is greater than that of the tunnel far away.The deformation of the tunnel is generally shown as a"horizontal duck egg"towards the excavation direction of the foundation pit.The surface subsidence caused by foundation pit excavation is generally funnel-shaped,and large in the middle and small on both sides.The maximum value occurs at 1.2~1.5 times the excavation depth of the foundation pit from the pit side.The influence range of foundation pit excavation on surface subsidence is about twice the excavation depth of foundation pit.The deformation of the subway tunnel and the surface subsidence is within the limits of related standards,and the safe operation of Line 1 of Shanghai Metro can be guaranteed.The research results have certain reference value for similar foundation pit design and safe construction.
作者
吴红斌
WU Hongbin(Tongji Architectural Design(Group)Co.,Ltd.,Shanghai 200092,China)
出处
《建筑结构》
北大核心
2023年第S01期2823-2827,共5页
Building Structure
关键词
基坑开挖
数值模拟
隧道变形
地表沉降
foundation pit excavation
numerical simulation
deformation of tunnel
surface subsidence
作者简介
吴红斌,硕士,工程师,主要从事地下结构、隧道工程设计的工作,Email:159612@qq.com。
