隧道明挖施工对临近地铁安全稳定性分析研究

Analysis and research on the influence of tunnel open cut construction on the safety and stability of adjacent Metro

针对徐州某市政重点工程明挖开挖对下穿的既有地铁项目为研究背景,探讨两个存在交叉点的临近工程施工影响规律,选取典型工程断面,通过数值模拟计算了明挖隧道开挖、支护、回填过程中,既有地铁隧道典型位置的位移变化.计算结果表明:随着地铁隧道深度的减小,明挖隧道基坑开挖对其下方地铁隧道的影响敏感性逐渐增大,应做好工程施工全过程的监控措施.研究结果对类似工程提供了设计和施工依据.

Based on the research background of the open cut excavation of a municipal key project in Xuzhou, this paper discusses the influence of two adjacent projects with intersection points on the construction, selects the typical project section, and calculates the displacement change of the typical position of the existing subway tunnel during the excavation, support and backfill of the open cut tunnel by numerical simulation. Calculation results: with the decrease of subway tunnel depth, the influence sensitivity of foundation pit excavation of open cut tunnel on the subway tunnel below is gradually increasing, and the monitoring measures for the whole process of engineering construction should be taken. The research results provide the design and construction basis for similar projects.