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辽宁省大伙房水库输水工程TBM2施工段13号支洞开挖至主支洞交叉段时发现一条断层破碎带,大型水工隧洞主支洞交叉点本身受力复杂,如果围岩稳定性差将严重影响施工安全。为防止塌方等地质灾害的发生,在施工中采用钻超前孔的方式探明地质情况,采取支设临时钢格栅、注浆、喷混凝土、分层开挖等方法,使工程施工得以顺利进行。
A fault fracture zone was found during the excavation of the branch hole of No. 13 branch of No. 13 at the TBM2 construction section of the Dahuofang Reservoir Water Conveyance Project in Liaoning Province to the main branch hole. The intersection of the main branch hole of the large hydraulic tunnel itself is subject to complicated forces. If the stability of the surrounding rock is poor, Affect construction safety. In order to prevent the occurrence of geological disasters such as landslides, the geology of the borehole is forecasted by means of drilling the advance hole in the construction, and the construction of the project can be carried out smoothly by adopting methods such as temporary steel grating, grouting, shotcrete, stratified excavation .