浅析某滑坡引发隧道变形原因及防治措施

摘要

A railway tunnel goes through mid and fore sections of an old landslide.The lack of the original treatment measures and the deteriorating geological conditions have led to revival of a part of the old landslide,so as to produce the disease which endangering traffic safety.The treatment measures using the mode of"upper retaining and lower jacking method"combined with drainage effectively curbed the development of the disease.In the paper,the following conclusions are drawn through the in-depth analysis of the causes of the disease and the changes of the internal forces in the tunnel before and after retaining:(1 )Under the similar geological conditions,16 m as the spacing between pile and tunnel is reasonable and feasible when the "upper retaining method"is used to treat the landslide;(2 ) Drainage measures in the treatment of the tunnel deformation caused by landslide can not be ignored.%某铁路隧道从一老滑坡体中前部通过，因原防治措施欠缺且工程地质条件不断恶化导致滑坡体局部复活，产生病害，危及行车安全。通过采取“上挡下托式”支挡与疏排水相结合的治理方案，有效遏制了病害的发展。文章深入剖析了该病害的成因和支挡前后隧道应力的分布变化，得出以下结论：（1）在类似地质条件下，采用“上挡式”加固滑坡时，抗滑桩与隧道间距采用16 m合理可行；（2）滑坡引发隧道变形病害治理工程中的疏排水措施不容忽视。