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针对旧关隧道出现的大水压情况,以超前钻孔泄水为基本出发点结合有效的开挖支护措施,采取了探测围岩级别、估计地下水发育、超前钻孔泄水、超前小导管固结、选择合理的开挖方法及施做径向小导管等措施,有效控制了大水压的危害及破坏作用,改善了施工条件,确保了施工质量和施工安全,加快了施工进度,提高了经济效益。
In view of the large water pressure in the tunnel of Old Customs, taking the pre-drilling drainage as the basic starting point and the effective excavation and support measures, we took the detection of the surrounding rock grade, estimated the development of groundwater, advanced drilling and drainage, advanced small catheterization Knot, select a reasonable method of excavation and the implementation of radial small catheter and other measures to effectively control the hazards and damaging effects of large water pressure to improve the construction conditions, to ensure the construction quality and construction safety, speed up the construction progress and improve Economic benefits.