二郎山隧道位于三大断裂“Y”字型交汇地带 ,地质构造极为复杂 ,伴有高地应力等不良地质现象 ,工程十分艰巨。地质勘察工作对正确确定隧道方案和进行设计与施工都是极为重要的。施工实践表明 ,二郎山隧道地质勘察工作是很成功的 ,而对引道地勘工作的忽视 ,却给施工带来了一系列的问题和损失 ,应引以为戒。 The Erlangshan Tunnel is located in the “Y” shaped intersection of the three major faults and the geological structure is extremely complicated with unfavorable geological phenomena such as high ground stress. The project is arduous. Geological prospecting work for the correct determination of the tunnel program and design and construction are extremely important. The construction practice shows that the geological prospecting work of Erlangshan Tunnel is very successful. However, the neglect of the geologic exploration work of the approach road has brought a series of problems and losses to the construction and should be taken as a warning.