软岩浅埋隧道施工对地表及围岩变形的影响分析

Analysis on Impact of Construction of Shallow-buried Soft Ground Tunnels on Deformations of Ground Surface and Surrounding Rock Mass

浅埋隧道开挖对周围环境的影响值得关注,基于重庆武隆隧道穿越厂房基础引起地表变形的工程背景,简化为平面应变模型,采用两种不同的计算方法对隧道施工进行了数值模拟分析,目的是研究不同软岩隧道开挖方式对地表变形及围岩受力情况的影响。通过支护与不支护两种工况的对比计算,结果表明,对浅埋隧道实施强支护、短开挖,并加强关键部位的加固,可有效减小隧道开挖对周围环境造成的影响。

The impact of excavation of shallow-buried tunnels on the surrounding environment is worthy of attention. basis of the deformations of the ground surface caused by the driving of Wulong tunnel underneath the foundations of buildings in Chongqing, simplified plane strain model is adopted and numerical simulation and analysis are made for the construction of the tunnel by two different calculation methods. The aim of the study is to analyze the impact of different excavation methods of soft tunnels on the ground deformations and force-beating conditions of the surrounding rock mass. The calculation results of two different construction conditions, i.e. , the construction condition with reinforcement and that without reinforcement, are compared. The comparison results show that if such measures as heavy reinforcement, short advance rate and consolidation of critical positions are taken for shallow-buried tunnels, the impact of the excavation of the tunnel on the surrounding environment can be effectively reduced.