近轨基坑开挖对地铁隧道影响分析  

Analysis on influence of adjacent foundation pit excavation to subway tunnel

作　　者：王兵 董维[1] 李益斌[1] Wang Bing;Dong Wei;Li Yibin

机构地区：[1]江苏苏州地质工程勘察院,江苏苏州215129

出　　处：《现代城市轨道交通》2022年第S01期80-86,共7页Modern Urban Transit

摘　　要：以苏州某邻近运营地铁隧道的深基坑工程为背景,通过实测的轨道保护和基坑监测数据分析基坑不同分区施工对邻近隧道的影响。结果表明:①基坑施工影响范围内的隧道会向着卸载的方向移动,且位移量随着开挖深度的加大而增加,在基坑开挖结束一段时间达到峰值;②三维模拟计算的结果同实测数据较为吻合,数值模型的建立、岩土参数及计算方法的选取都较为合理,能够有效地反应基坑开挖施工对自身围护结构及周边环境产生的影响,进而指导现场施工;③模拟计算结果及实际的监测数据均表明基坑施工会对临近的地铁隧道在水平向及竖向的位移产生一定影响,但在施工方案和现场施工组织均正常合理的情况下,整体安全可控,影响有限。Taking a deep foundation pit adjacent to subway tunnel in Suzhou as a sample,analyzing the influence of foundation pit construction in different zones to adjacent tunnels by the measured track protection and foundation pit monitoring data.The main contents and conclusions are:①The tunnel will move towards the unloading direction of foundation pit construction,and the displacement increases with the increase of excavation depth,reaching the peak at the end of foundation pit excavation;②The results of 3D numerical simulation are consistent with the measured data.The establishment of numerical model,the selection of geotechnical parameters and calculation methods are reasonable,which can effectively reflect the impact of foundation pit excavation on its own retaining structure and surrounding environment,and then guide the on-site construction;③The simulation results and actual monitoring data indicate the foundation pit construction will have a certain impact on the horizontal and vertical displacement of the adjacent subway tunnel,but under the condition that the construction scheme and on-site construction organization are normal and reasonable,the overall safety is controllable and the impact is limited.

关 键 词：地铁施工 盾构隧道 深基坑 变形 三维数值模拟 

分 类 号：U231.3[交通运输工程—道路与铁道工程] TU452[建筑科学—岩土工程]