两侧基坑开挖对隧道影响的实测与分析

Measurement and Analysis of Tunnel Impact Caused by Excavation ofFoundation Pits on Both Sides

结合某基坑工程案例,采用数值方法分析了两侧基坑非对称开挖对既有运营隧道的影响。监测结果表明,两侧不对称基坑开挖施工,会导致隧道出现偏向于大基坑方向的位移,造成既有隧道出现一定的隆起变形;同时,开挖过程中合理安排两侧基坑施工作业顺序能有效控制隧道的水平位移。本研究可为后续类似工程优化设计和施工提供参考和借鉴。

Based on a case study of a foundation pit project,this paper uses numerical methods to analyze the impact of asymmetric ex-cavation of foundation pits on both sides of existing tunnel.The measurement results show that asymmetric excavation of foundation pits on both sides can lead to displacement of the tunnel in the direction of the large foundation pit and result in uplift and deformation of the existing tunnel.At the same time,reasonable arrangement of construction sequence of foundation pits on both sides can effectively control the horizontal displacement of the tunnel,which provides reference for the optimal design and construction of similar projects in the future.