中国水利Issue(17)：57-65,9.DOI:10.3969/j.issn.1000-1123.2025.17.010
深埋长大隧洞穿越活动断裂带关键技术研究及应用
Research and application of key technologies for deep-buried long tunnels crossing active fault zones——a case study of the Shizishan Tunnel in the Central Yunnan Water Diversion Project
摘要
Abstract
The Shizishan Tunnel of the Central Yunnan Water Diversion Project has a total length of 21.17 km and a maximum burial depth of 694 m.The downstream main tunnel of its No.4 branch crosses the F16 Chenghai-Binchuan active fault zone.This fault zone,active since the Late Pleistocene,is characterized by soft surrounding rock,high ground stress,abundant seepage,and multiple clay interlayers.During construction,fractured surrounding rock with extremely low rock mass strength,dripping and seeping water,and other unfavorable conditions were encountered,leading to problems such as large daily deformation,cracking and delamination of initial shotcrete,and collapse.Based on advanced geological forecasting,comprehensive assessments indicated risks of B-level sudden water inrush and extremely severe squeezing deformation.By adopting integrated construction technologies,including pre-excavation advanced exploration,pre-consolidation grouting,and advanced support,as well as increasing reserved deformation allowance,optimizing excavation methods,strengthening initial support,adding temporary struts,implementing drainage and pressure reduction,enhancing temporary monitoring during construction,and promptly following up with secondary concrete lining and permanent monitoring after excavation,the project successfully resolved technical challenges such as sudden water and mud inrush,significant vertical and horizontal displacements,and extremely unstable surrounding rock.These key technologies ensured the safe crossing of the F16 Chenghai-Binchuan active fault zone and can provide reference for tunnel construction in large-scale water diversion projects through similar active fault zones.关键词
深埋长大隧洞/活动断裂带/围岩稳定/关键施工技术/云南滇中引水工程Key words
deep-buried long tunnel/active fault zone/surrounding rock stability/key construction technology/Central Yunnan Water Diversion Project分类
建筑与水利引用本文复制引用
欧阳林,张世强,任恒钦,蒋继彬,甲茨拉姆,赵磊..深埋长大隧洞穿越活动断裂带关键技术研究及应用[J].中国水利,2025,(17):57-65,9.基金项目
云南省重大科技专项计划项目(202002AF080003、202102AF080001). （202002AF080003、202102AF080001）
