CCS水电站引水隧洞TBM断层带卡机脱困技术

发布时间：2018-04-13 20:42

本文选题：CCS水电站 + 引水隧洞　；参考：《水利水电科技进展》2017年05期

【摘要】：厄瓜多尔CCS水电站引水隧洞采用大直径双护盾TBM施工,开挖洞径9.11 m,在掘进至桩号K16+127.0 m时,由于断层破碎带围岩塌方掩埋及堵塞刀盘造成卡机事故。在分析地震法物探成果和钻孔岩芯的基础上,确定断层破碎带及影响带宽度约70 m,围岩稳定性差,以Ⅳ类为主,局部Ⅴ类。拆除刀盘后方16.26 m处管片的上半部分后,沿洞壁两侧开挖旁洞,至刀盘后沿引水隧洞轴线进行导洞顶拱扩挖直至通过断层破碎带,导洞开挖前采用超前锚杆、固结灌浆等超前支护措施,开挖后采用钢拱架、系统锚杆、挂网喷射混凝土支护措施;支护完成的导洞防止了TBM掘进时的洞顶塌方,TBM在断层破碎带内掘进时,每环掘进前均对掌子面前方围岩进行固结灌浆以防掌子面围岩塌方;采用以上技术措施后,TBM成功脱困并穿过了断层破碎带。
[Abstract]:The diversion tunnel of CCS Hydropower Station in Ecuador is constructed with large diameter double shield TBM. The diameter of excavation tunnel is 9.11m. when excavating to the pile number K16 127.0 m, the accident of clamping machine is caused by the collapse of surrounding rock in the broken zone of fault and blockage of cutter head.Based on the analysis of geophysical exploration results of seismic method and drilling core, it is determined that the width of fault fracture zone and influence zone is about 70 m, and the stability of surrounding rock is poor.After removing the upper half of the segment at 16.26 m behind the cutter head, the side holes are excavated along the two sides of the tunnel wall, and the top arch of the guide tunnel is expanded and excavated along the axis of the diversion tunnel to the end of the tunnel to pass through the broken zone of the fault. The leading anchor rod is used before the excavation of the guide hole.After excavation, the steel arch frame, the system bolt and the net shotcrete support are adopted, and the guide tunnel completed by the support prevents the caving of the roof of TBM from driving in the fault breakage zone.The surrounding rock in front of the face face is consolidated and grouting is carried out before each ring heading to prevent the wall rock from collapsing. After adopting the above technical measures, TBM successfully extricates itself and passes through the fracture zone of the fault.
【作者单位】：黄河勘测规划设计有限公司;
【分类号】：TV554

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