大跨度隧道施工地表沉降分析

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。

Analysis on floor subsidence in large-span tunnel construction

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.