摘要
石马寨隧道进口浅埋段穿越岩溶发育地带,地层强风化遇水易崩解且伴有大量孤石,提出多种加固方案并进行比选。综合环保、经济等因素,最终采取隧道洞内掌子面长管劈裂注浆对围岩拱部进行加固,结合超前锚杆及超前排水孔等措施防止掌子面失稳。通过注浆量控制、检查孔试验、现场监控量测综合判断围岩加固效果,围岩达到稳定状态,效果良好。现场施工工艺、控制措施以及加固效果评估方法可为类似地质情况下工程施工提供借鉴与参考.
The shallow-buried entrance section of Shimazhai Tunnel passes through the karst development area. The strong weathered stratum of this area is easily disintegrated while encountering water with a large number of boulders. In order to ensure the safety of the project, various reinforcement schemes were proposed and compared. Considering environmental protection, economic and other factors, the arch of surrounding rock was strengthened by split grouting of long pipe in the tunnel face. The advanced rockbolts and advanced drainage holes were proposed to strength the surrounding rock in front of the face. By controlling the amount of grouting, inspection hole testing and on-site monitoring, the surrounding rock reinforcement effect was comprehensively evaluated. Finally, good effect of surrounding rock stability was achieved and the safety of tunnel construction was guaranteed. The on-site construction process, the control measures and the relevant evaluating methods could provide reference for underground engineering construction in similar geological conditions.
作者
李庆斌
Li Qingbin(China Railway 18^th Bureau Group Co. Ltd. , Tianjin 300222 , China)
出处
《铁道建筑技术》
2019年第3期113-117,共5页
Railway Construction Technology
基金
中国铁建科技研究开发计划及资助计划项目(2018-C17)
中铁十八局集团科技研发项目(G18-01)
关键词
浅埋段
围岩加固
长管劈裂注浆
超前锚杆
shallow-buried section
surrounding rock reinforcement
long tube splitting grouting
advanced anchor bolt
作者简介
李庆斌(1981-),男,山东郓城人,高级工程师.主要从事桥梁与隧道施工技术以及标准制定等方面的工作;E-mail:32237253@qq.com.
