大跨度隧道施工地表沉降分析

Analysis on floor subsidence in large-span tunnel construction

以广州地铁二号线公园前站—纪念堂站区间为例,通过有限元程序ANSYS对软弱围岩浅埋暗挖大跨度隧道的开挖与支护进行了平面数值模拟,以地表沉降为控制基准,对地表沉降影响进行了研究,结果表明,采用双侧壁导坑法施工是可行的。

Taking the example of the section from Front Park Stop to Memorial Hall Stop of subway No. 2 line in Guangzhou, it applies the limited element program ANSYS to make a plane digital simulation of the excavation and support of soft surrounding rock shallow-buried subsurface excavated large-span tunnel. With floor subsidence as the control criterion, it makes a research on the influence of floor subsidence, and the research result shows double side-drift method is feasible.