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文章以大连市石门山隧道穿越超浅埋段的结构设计为例,采用2D-σ有限元分析软件对隧道围岩应力场及位移场进行分析研究,并结合现场施工检测结果,得出拱顶中心处地表沉降量是确定支护参数选取的关键因素,在隧道支护提供足够刚度的前提下,只要控制好拱顶地表下沉量,超浅埋大跨度暗挖隧道是可以实现的,同时也得出及时准确的施工监测是决定超浅埋大跨度隧道施工成败的关键因素。
Taking the design of Shimen tunnel in Dalian as an example, the stress field and displacement field of tunnel surrounding rock are analyzed by 2D-σ finite element analysis software. Combined with the field test results, the vault The settlement of the ground surface at the center is the key factor for determining the supporting parameters. Under the premise of providing sufficient rigidity of the tunnel support, it is possible to realize the ultra-shallow buried long-span undercut tunnel as long as the surface subsidence of the vault is controlled. It is also concluded that timely and accurate construction monitoring is the key factor that determines the success or failure of the ultra-shallow buried long-span tunnel construction.