基坑工程对运营地铁隧道影响的实测分析  

Analysis of the Influence of Foundation Pit Construction on an Operating Metro Tunnel Based on Field Measurement

作　　者：魏纲[1] 李钢[2] 苏勤卫 

机构地区：[1]浙江大学城市学院土木工程系,杭州310015 [2]浙江大学建筑工程学院,杭州310058

出　　处：《现代隧道技术》2014年第1期179-185,共7页Modern Tunnelling Technology

基　　金：国家自然科学基金资助项目(51078332);浙江省自然科学基金资助项目(Z1100016)

摘　　要：杭州市某地下通道工程上跨已运营的杭州地铁1号线盾构隧道,其基坑上跨段地质条件及周围环境复杂,需对其引起的既有隧道的变形进行严格控制,因此设计中针对性地采取了地基加固、分段开挖等施工控制措施。文章针对桩基工程阶段和基坑开挖阶段的隧道监测数据,研究分析了不同施工阶段盾构隧道竖向位移、水平向位移及收敛变形的规律和特点。实测结果表明:桩基工程施工可引起隧道的竖向下沉(最大值为5 mm),对水平径向收敛影响不大;基坑开挖可引起隧道的上浮(最大值1.9 mm)及水平径向收敛变形,对水平位移影响不大。An underground passage passes over the existing shield-driven tunnel of the Hangzhou Metro line 1. Due to the complex geological conditions and surrounding environment of the over-passing section, tunnel deformation has to be strictly controlled. For this reason, control measures like foundation reinforcement and sectional excavation are considered in the tunnel design. Based on the monitoring data from the pile foundation construction and foundation pit excavation, this paper analyzes the rules and characteristics of the vertical displacement, horizontal displacement, and convergence of the shield-driven tunnel at different construction stages. The results show that the pile foundation construction may cause vertical settlement of the tunnel （maximum： 5mm）, but has little influence on the horizontal convergence; additionally, foundation pit excavation may cause tunnel floating （maximum： 5mm） and horizontal radial convergence, but has little influence on the horizontal displacement.

关 键 词：盾构隧道 基坑开挖 上跨地铁隧道 现场监测 数据分析 

分 类 号：U456.3[建筑科学—桥梁与隧道工程]