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对超浅埋近距离双孔大跨径的平行隧道,采用不同的开挖方法和开挖顺序会有不同的结果,两洞室开挖时,由于洞室开挖的不同步,地层刚度不再对称,后续开挖洞室的施工对已开挖的洞室有影响,其影响又与围岩级别、隧道间的间距、开挖和支护方式等因素相关,采用有限元方法模拟这些因素对此类隧道在开挖后地表和拱顶下沉的影响规律。
There are different results for different methods of excavation and excavation sequence for the parallel tunnel with ultra-shallow buried short-bore and long-span. For the excavation of the two-compartment tunnel, due to the unsynchronized excavation, the rigidity of the formation is not Symmetrical, the construction of subsequent excavation caverns have an impact on the excavation of the cavern, and its influence and the surrounding rock level, the spacing between the tunnels, excavation and support methods and other factors related to the use of finite element method to simulate these factors The influence of such tunnel on the surface and vault sinking after excavation.