香炉山隧洞不良地质段"L"型地面超前注浆方案研究
L-Shaped Ground Advance Grouting Scheme in Bad Geological Section of Xianglushan Tunnel
赵利鹏 1李坚 2雷啸天 3郭亚欣 2王廷超 2陶志刚3
作者信息
- 1. 中国葛洲坝集团三峡建设工程有限公司,湖北 宜昌 443000;云南省滇中引水工程有限公司,云南 昆明 650000
- 2. 云南省滇中引水工程有限公司,云南 昆明 650000
- 3. 中国矿业大学(北京) 隧道工程灾变防控与智能建养全国重点实验室,北京 100083;中国矿业大学(北京)力学与建筑工程学院,北京 100083
- 折叠
摘要
为解决隧道(洞)建设过程中不良地质段突泥涌水和软岩大变形等问题,依托滇中引水工程香炉山隧洞,提出一种采用全孔长度超过 500 m的地面"L"型定向钻孔注浆并辅以洞内超前注浆的加固方法,在实际工程中确定这一方法的具体设计方案.首先,通过现场地质调查与分析,揭示不良地质区段香炉山隧洞建设的技术难点;其次,介绍"L"型定向钻孔注浆的施工过程及注浆工艺;然后,设计出一种能够提高地层稳定性的"L"型地面超前注浆方案,并对地层进行加固;最后,采用掌子面揭示、注浆技术以及大地电磁检测等手段证明现场注浆效果.研究结果表明:1)"Z1+Z2+Z4"钻场设计为最优地面超前注浆技术方案;2)"L"型定向钻孔注浆辅以洞内超前注浆技术可满足盲区注浆区域覆盖问题,实现真正意义上的超前治理.
Abstract
Large mud and water gushing and soft rock deformation often occur in-tunnel sections with poor geology.Therefore,an L-shaped ground directional drilling and grouting with an entire hole length of over 500 m assisted by in-tunnel advance grouting is proposed for the construction of the Xianglushan tunnel of the Central Yunnan water-conveyance project.The specific design scheme of the proposed method is determined.First,the on-site geological survey results reveal the technical difficulties of the unfavorable geological sections of the Xianglushan tunnel.The construction process and grouting technology of the L-shaped directional drilling grouting are explained.Second,a ground reinforcement scheme for L-shaped ground advance grouting is designed to improve the stratum stability.Finally,the on-site grouting effect is illustrated by tunnel face revelation,grouting results,and magnetotelluric analysis.The results show that the Z1+Z2+Z4 drilling field design is the optimal ground advance grouting scheme,and the L-shaped directional drilling grouting assisted with advance in-tunnel grouting technology can cover the grouting area in the blind area,realizing advance reinforcement.
关键词
深埋隧洞/输水隧洞/不良地质段/突泥涌水/软岩大变形/地面"L"型定向钻孔注浆Key words
deep-buried tunnel/water-conveyance tunnel/bad geology section/mud and water gushing/soft rock large deformation/L-shaped ground directional drilling and grouting引用本文复制引用
基金项目
云南省重大科技专项计划项目(202002AF080003)
出版年
2024
NETL
NSTL
万方数据