自建国以来仅西南地区铁路隧道已建成近1400km,为铁路隧道建设取得了宝贵的经验,由于勘测、设计和施工水平的逐步提高,隧道坍方事故有所减少。但由于对自然情况认识不足,或虽对坍方有一定预计,但缺乏相应的预防措施,坍方还是时有发生,有的仍很严重, Since the founding of the People’s Republic of China, only the railway tunnel in southwest China has been built nearly 1400 km, which has gained precious experience for railway tunnel construction. Due to the gradual increase of survey, design and construction, tunnel collapse accidents have been reduced. However, due to lack of understanding of the natural conditions, or although there is a certain prediction of the slump, but the lack of corresponding preventive measures, the collapse occurs from time to time, and some are still grave.