改进隧道式锚碇变形破坏机制与安全性研究  

Formation-destruction mechanism and safety study of the improved tunnel anchorage

作　　者：张秋实 ZHANG Qiushi(China 19th Metallurgical Group survey and design company,Chengdu 610200,Sichuan,China)

机构地区：[1]中国十九冶集团有限公司,四川成都610200

出　　处：《工程建设》2024年第2期7-11,共5页Engineering Construction

基　　金：中国十九冶集团有限公司科研计划课题项目(2022-2-12)。

摘　　要：隧道锚具有承载力大,造价低,对周边环境影响小等优点。为探究改进新型隧道锚碇与传统重力式锚碇在正常设计缆力和超缆力荷载下力学响应规律,利用有限元方法建立围岩-锚塞体模型,系统监测荷载前后锚塞体的应力、变形及塑性区发展趋势,并结合安全系数对隧道锚承载力进行评估。研究结果表明:新型改进隧道式锚碇与传统重力式锚碇相比承载力提升约5.92%;锚塞体与围岩最优倾角约为30°~40°,改进新型隧道锚的极限承载力约为10倍设计缆力。Tunnel anchor has the advantages of large bearing capacity,low cost and little influence on the surrounding environment.In order to explore the mechanical response law of the improved new tunnel anchorage and the traditional gravity anchorage under normal design cable force and super cable force load,the finite element method is used to establish the surrounding rock-anchor body model,and the stress,deformation and plastic zone development trend of the anchor body before and after the load are systematically monitored.Combined with the safety factor,the bearing capacity of tunnel anchor is evaluated.The results show that the bearing capacity of the new improved tunnel anchorage is about 5.92%higher than that of the traditional gravity anchorage.The optimal inclination angle between the anchor body and the surrounding rock is about 30°~40°,and the ultimate bearing capacity of the improved new tunnel anchor is about 10 times the design cable force.

关 键 词：隧道式锚碇 岩体塑性区 安全系数 数值分析 

分 类 号：TU457[建筑科学—岩土工程]