摘要
结合木寨岭隧道软岩大变形动态设计情况,介绍隧道所处特殊地质环境,分析施工中出现的初期支护侵限、二衬裂损等病害原因,研究针对极高地应力软岩大变形问题采取的多层支护体系以及超前应力释放小导洞扩挖、长锚杆(锚索)加固、仰拱桁架加固、设置缓冲结构等特殊措施。工程实践表明,采取的技术对策安全可靠,效果明显,并就施工中有待进一步解决的问题进行探讨,在类似工程中可参考借鉴。
Based on the dynamic design of the large deformation of weak surrounding rock in Muzhailing Tunnel,the article introduced the special geological environment of the tunnel,analyzed the causes of the primary support intruding into tunnel structure gauge and the secondary lining cracking during construction,and studied the special measures to solve the problem of the large deformation in weak surrounding rock with extreme crustal stress,such as the multiple support system,enlargement of the advance heading for stress release,the reinforcement of long system anchor bolt(anchor cable),the reinforcement of invert steel truss and the setting of cushion structure.The engineering practice suggested,the technical countermeasures adopted were safe,reliable and effective,and the problems to be solved in construction were discussed,which could be used for reference in similar projects.
作者
王福善
WANG Fushan(China Railway Siyuan Survey and Design Group Co.,Ltd,Wuhan 430063,Hubei,China)
出处
《隧道与地下工程灾害防治》
2020年第4期65-73,共9页
Hazard Control in Tunnelling and Underground Engineering
关键词
隧道
地质环境
极高地应力
软弱围岩
大变形
支护体系
特殊措施
tunnel
geological environment
extreme crustal stress
weak surrounding rock
the large deformation
supporting system
special measures
