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通过对山岭隧道新的排水原则的理解,指出了要在隧道开挖前进行预注浆堵水,从而达到“控制排水”原则的目的;提出了在围岩注浆情况下隧道的两种外水荷载的概念;并分别对加固圈和衬砌结构的外水荷载进行了受力分析,分析结果表明,在现有的技术条件下,单纯的围岩注浆,虽然可以达到堵水的目的,但并不能保证衬砌结构的安全,还必须采取“小排”的方式,排除衬砌背后多余的水,以消除衬砌背后的外水压力。
Through the understanding of the new drainage principle in mountain tunnels, it is pointed out that pre-grouting water blocking should be done before tunnel excavation so as to achieve the principle of “controlling drainage”. Two kinds of tunnels are proposed in case of surrounding rock grouting Water load. The stress analysis of the external water load of the reinforcement ring and the lining structure respectively is carried out. The analysis results show that the grouting of the surrounding rock can achieve the purpose of water plugging under the existing technical conditions, However, it can not guarantee the safety of the lining structure. Therefore, it is necessary to adopt the method of “small row” to eliminate the excess water behind the lining to eliminate the external water pressure behind the lining.