分水岭隧道软弱围岩大变形特征及其控制技术研究  

Study on Large Deformation Characteristics and Control Technology of Weak Surrounding Rock of Watershed Tunnel

作　　者：刘思迪 王兆丰[1] Liu Si-di;Wang Zhao-feng(School of Safety Science and Engineering,Henan University of Technology,Henan Jiozuo 454000)

机构地区：[1]河南理工大学安全科学与工程学院,河南焦作454000

出　　处：《山东煤炭科技》2020年第7期147-149,155,共4页Shandong Coal Science and Technology

基　　金：国家自然科学基金资助项目(51274090);河南省高校科技创新团队支持计划资助项目(17IRTSTHN030)。

摘　　要：分水岭隧道穿越中风化砂岩、灰岩、泥灰岩等复杂地层,为软弱围岩隧道。以该隧道施工过程中出现的大变形为工程实例,分析了大变形特征,研究了大变形控制技术,得出了该隧道具有变形时间长、变形速率快、变形量大等特征,通过采用三台阶开挖方式、双层初期支护并扩大预留变形量为450 mm能较好地解决分水岭隧道大变形问题。Fenshuiling tunnel is a tunnel with weak surrounding rock,which passes through complex strata such as moderately weathered sandstone,limestone and marl.Taking the large deformation occurred in the construction process of the tunnel as an engineering example,the characteristics of large deformation are analyzed,and the large deformation control technology is studied.It is concluded that the tunnel has the characteristics of long deformation time,fast deformation rate and large deformation.The large deformation problem of watershed tunnel can be solved by adopting three bench excavation method,double-layer initial support and expanding the reserved deformation to 450 mm.

关 键 词：分水岭隧道 软弱围岩 变形特征 控制技术 

分 类 号：U455[建筑科学—桥梁与隧道工程]