不良地质段双护盾TBM施工综合处理技术  

Comprehensive treatments of double shield TBM construction in adverse geological sections

作　　者：杨继华 闫长斌 齐三红 郭卫新 杨风威 YANG Jihua;YAN Changbin;QI Sanhong;GUO Weixin;YANG Fengwei(Yellow River Engineering Consulting Co.,Ltd.,Zhengzhou 450003,Henan,China;College of Hydraulic and Civil Engineering,Zhengzhou University,Zhengzhou 450001,Henan,China)

机构地区：[1]黄河勘测规划设计研究院有限公司,河南郑州450003 [2]郑州大学水利与土木工程学院,河南郑州450001

出　　处：《隧道与地下工程灾害防治》2023年第2期59-70,共12页Hazard Control in Tunnelling and Underground Engineering

基　　金：国家自然科学基金资助项目(41972270);水利部黄河流域水治理与水安全重点实验室(筹)研究基金资助项目(2022-SYSJJ-06);盾构及掘进技术国家重点实验室开放课题资助项目(SKLST-2019-K06);黄河勘测规划设计研究院有限公司自主研究开发资助项目(2020-ky04、2022KY003、2023KY014)。

摘　　要：针对兰州市水源地建设工程深埋长输水隧洞双护盾TBM在不良地质条件下的施工问题,采用数据统计、工程类比等方法,提出了综合处理技术及措施。在TBM施工前,对F3及F8断层带采用钻爆法开挖,初期支护保证围岩稳定后,TBM滑行通过并安装管片;采用了以隧洞沿线地质分析为基础,结合掌子面围岩观察、岩渣分析、掘进参数分析、三维地震法和三维电阻率法等方法的综合超前地质预报方法,对掌子面前围岩地质条件进行综合预报;采用“以排为主,排堵结合”的原则,建立TBM变坡段排水系统,根据涌水量确定排水系统的运行方式,减轻了涌水对施工的影响;根据TBM前盾被卡的特征,采用从伸缩护盾处人工开挖导洞释放围岩压力的方法使TBM脱困;采用化学灌浆和水泥灌浆固结破碎围岩,控制TBM掘进参数,慢速掘进通过破碎带。TBM施工实践表明:所采用的技术行之有效,不良地质条件未对TBM造成严重后果.Aiming at the poor geological conditions of water conveyance tunnel in Lanzhou water source construction engineering by double shield TBM excavation,the comprehensive methods and treatments were put forward by data sta-tistics,engineering analogies,and other methods.Before TBM tunneling,F3 fault zone and F8 fault zone were excava-ted by drilling and blasting method.After initial support which guaranteed the stability of surrounding rock,TBM slided through and installed segments.Based on geological analysis along tunnel,combination the observation of tunneling face,rock muck analysis and tunneling parameter analysis,the geological conditions of surrounding rock in front of tun-neling face were comprehensively predicted by using three-dimension seismic method and three-dimensional resistivity method.The principle of"drainage first,drainage and plugging combined"was adopted,the variable slope drainage system was established,the operation mode of the drainage system was determined according to the amount of water gushing.According to the characteristics of the front shield blocked,the method of releasing surrounding rock pressure by manual excavation of the heading tunnel from the telescopic shield was adopted to make the TBM out of blocked.Based on identifying geological conditions,the use of chemical grouting and cement grouting consolidation broken sur-rounding rock,controlling TBM tunneling parameters,slow tunneling through the fracture zone.TBM tunnneling prac-tice shows that the adopted technology is effective and the poor geological conditions have not caused serious conse-quences for TBM.

关 键 词：输水隧洞 兰州水源地 双护盾TBM 不良地质条件 综合处理 

分 类 号：TV554.2[水利工程—水利水电工程]