不同支护形式对隧洞穿越断裂带段围岩力学行为分析  

Analysis of Mechanical Behavior of Surrounding Rock by Different Support Formsat the Section Where Tunnel Crosses Fracture Zone

作　　者：姚岩杰 Yao Yanjie(China Railway 18th Bureau Group No.3 Engineering Co.,Ltd.,Zhuozhou 072750,China)

机构地区：[1]中铁十八局集团第三工程有限公司,河北涿州072750

出　　处：《市政技术》2021年第10期100-102,共3页Journal of Municipal Technology

摘　　要：基于某引水隧洞工程,应用有限元计算方法对洞内明管、洞内埋管2种不同的支护方案实施过程中,隧洞穿越断裂带段围岩的力学行为进行了分析。经综合评价分析得出:1)洞内埋管支护方案在无错动情况下安全性非常好,但50年后,在100年断层错动作用下,衬砌混凝土实际荷载强度已超过设计抗拉强度,可能出现拉裂破坏;2)加强支护对改善围岩稳定性效果明显,并可改善衬砌结构的受拉状态。该综合评价分析结果,可为类似工程设计和施工提供参考。Based on a diversion tunnel project,during the implementation of 2 support schemes of exposed pipe and buried pipe,finite element method is used to analyse the mechanical behaviour of the surrounding rock at the section where the tunnel crosses the fracture zone.Through comprehensive evaluation and analysis,it is known that 1)safety of the buried pipe support scheme is good without dislocation.After 50 years,under the action of 100-year fault movement,the actual load strength of lining concrete has exceeded the designed tensile strength and tensile crack may occur.2)strengthening support has obvious effect on stability of surrounding rock and improves the tensile state of lining structure.The result provide reference for design and construction of similar projects.

关 键 词：隧洞 洞室 明管支护 埋管支护 

分 类 号：U455.72[建筑科学—桥梁与隧道工程]