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由于软弱地层常出现风化带、地形偏压、软弱堆积物、软弱围岩等特殊的地质问题,浅埋软弱围岩大跨隧道施工过程中面临着的围岩变形的困难。除此之外,浅埋软弱围岩隧道与普通隧道不同,必须选择合适的施工方法避免拱顶下沉或者地表开裂的问题。本文结合浅埋软弱围岩大跨隧道的施工难点,提出了具体的施工方法。
Due to the special geological problems such as weathered zone, topography bias, weak accumulation and weak surrounding rock, the deformation of surrounding rock in the process of shallow long-span tunnel with shallow surrounding rock is difficult. In addition, shallow and soft surrounding rock tunnels are different from ordinary tunnels, and the proper construction method must be chosen to avoid the problem of crown sagging or surface cracking. Based on the construction difficulties of large-span tunnel with shallow buried weak rock, a concrete construction method is put forward.