摘要
为解决软弱围岩隧道树脂锚杆施工工艺复杂、工效低的问题,在分析传统树脂锚杆局限性的基础上,针对性提出2种内置树脂预应力中空锚杆技术方案;采用工作原理分析、结构设计以及现场试验等方法,对其在软弱围岩中的适用性进行研究。研究结果表明:1)针对一般破碎围岩工况的内置树脂预应力中空锚杆安装合格率为81.9%,高于传统树脂锚杆的50%合格率;2)内置树脂预应力中空锚杆杆长为3 m和4 m的净作业时间分别为4.62 min和5.55 min;3)考虑台车进场准备时间等因素,内置树脂预应力中空锚杆杆长为3 m和4 m的综合作业时间分别有望控制在6.0~6.5 min和7.0~7.5 min;4)针对极破碎围岩以及预应力长锚杆工况的自进式内置树脂预应力中空锚杆能够实现“自进+预紧”的功能,对围岩进行及时支护,同时施工工效与普通自进式锚杆相当。
The construction of resin anchor bolts in soft surrounding rock tunnels is complex and inefficient.To address the limitations of traditional resin bolts,two technical schemes involving prestressed hollow bolts with built-in resin are proposed.Their applicability in soft surrounding rocks is examined via working principle analysis,structural design,and field testing.The results reveal the following:(1)Under normal broken surrounding rock conditions,the installation qualification rate of prestressed hollow bolts with built-in resin is 81.9%,significantly higher than that of traditional resin bolts(50%);(2)The net operation times for 3 m and 4 m prestressed hollow bolts with built-in resin are 4.62 min and 5.55 min,respectively;(3)Considering the preparation time for the trolley,the total operation time is controlled within 6-6.5 min and 7-7.5 min,respectively;(4)The self-drilling prestressed hollow bolt with built-in resin achieves self-drilling and pretightening for severely broken surrounding rocks through long prestressed bolts,enabling timely support of the surrounding rock.The construction efficiency of this type of bolt is comparable to that of traditional bolts.
作者
邹文浩
马伟斌
刘艳青
张金龙
郭小雄
安哲立
高红杰
徐浩田
ZOU Wenhao;MA Weibin;LIU Yanqing;ZHANG Jinlong;GUO Xiaoxiong;AN Zheli;GAO Hongjie;XU Haotian(Railway Engineering Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China;State Key Laboratory of High-speed Railway Track System,Beijing 100081,China)
出处
《隧道建设(中英文)》
CSCD
北大核心
2024年第12期2385-2392,共8页
Tunnel Construction
基金
浙江省重点研发计划项目(2021C01029)
成都市重点研发项目(2022-XT00-00002-GX)
国铁集团重大课题(K2023G041)。
关键词
铁路隧道
内置树脂
预应力中空锚杆
锚固支护
软弱围岩
自进式锚杆
railway tunnel
built-in resin
prestressed hollow bolt
anchorage support
soft surrounding rock
self-drilling bolt
