隧道施工中围岩及初期支护大变形的认识与探讨

Understanding and discussion of large deformation on soft wall rock and initial support during tunnel construction

近几年来隧道施工中常有围岩或初期支护发生大变形的事例,每次造成的损失少则数十万元多则上百万元,加强对这一现象的认识与探讨,预防发生大变形事故,是隧道施工人员需认真面对的课题。文章收集整理了一些相关资料,对初支变形的原因、应对措施等作了一些简要介绍,希望能为类似工程防变形施工提供一点参考。

It is learned that large deformation is occuring in wall rock or initial support during tunnel construction in recent years. The loss caused each time ranges from several hundred thousand yuan to even million yuan. Understanding and discussion about it should be enhanced to prevent large deformation accidents. It is also the subject that tunnel constructor needs to confront carefully. In the paper some related data are collected and rearranged, at the same time the cause and countermeasure of deformation of initial support are introduced simply. Some references are expected to be supplied for similar engineering.