千枚岩软岩大变形隧道施工处理措施

Treatment Measures for Large Deformation Tunnel of Phyllite Soft Rock

香嘎山隧道工程施工过程中千枚岩软岩大变形,掌子面溜坍,初支侵限二衬,隧道出现纵向裂纹。为研究千枚岩变形的原因及处理方案,根据隧道的特点和洞身开挖过程中所出现的变形换拱情况,文章通过变形观测、试验、超前地质预报等方法,分析千枚岩变形的特点,提出相应的工程处理措施。

In the construction process of Xiangga Mountain tunnel, the soft rock of the phyllite is greatly deformed, the face of the slab is slippery, the initial branch is intrusion, and the longitudinal crack occurs in the tunnel. In order to study the causes and treatment schemes of phyllite deformation, according to the characteristics of the tunnel and the deformation of the arch during the tunnel excavation process, the deformation characteristics of the phyllite are analyzed through deformation observation, test and advanced geological prediction and corresponding engineering treatment measures are proposed.