在不良地质中修建隧道,衬砌由于不均匀受力或早期受力,开裂较为普遍。有的随衬随裂,成为病害工程;个别严重的甚至垮墙掉拱,成为“拦路虎”。目前衬砌结构的一般形式是:地质越坏,断面越厚。这样不仅圬工量大,施工进度慢;还由于开挖断面的增大,山体压力也随之增大,从而有时仍未能防止衬砌开裂。衬砌开裂比较严重时,常用的补救措施 Construction of tunnels in poor geology, cracking is common due to uneven or early stress. Some of them followed and cracked and became disease works. Some even severed their walls and fell into arches and became “stumbling blocks.” The general form of the current lining structure is: the worse the geological, thicker section. In this way, not only the construction work is sluggish, but also the construction progress is slow. Due to the increase of the excavation section, the pressure of the mountain also increases, which sometimes fails to prevent the lining from cracking. Lining more serious cracking, the common remedies