隧道通过不良地质地段的情况是多种多样的，其中以通过大量涌水地段及非常软弱地段的施工最为困难和复杂。所谓大量涌水地段即隧道围岩内含有大量的水，开挖后会产生大量涌水，使开挖相当困难甚至根本无法开挖的地段；所谓非常软弱地段即隧道围岩非常软弱，用通常开挖方法在进 Tunnels pass through adverse geological conditions in a variety of situations, of which the most difficult and complicated are the construction of tunnels through lots of gushing water and very weak sections. The so-called a large number of water gushing tunnel that contains a lot of water inside the tunnel, after excavation will produce a large amount of gushing water, so that excavation is quite difficult or impossible excavation of the area; the so-called very weak section of the tunnel surrounding rock is very weak, Method in progress