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在富水砂层和全风化花岗岩为主的软弱不均地层中进行基坑开挖,为了防止开挖过程中由于坑壁渗漏水造成基坑失稳、坍塌、管涌等灾害,除采取适当的支护措施外,还须对基坑周边进行止水处理,限制地下水向基坑内的流动,常用的注浆止水方法有袖阀管注浆和二重管注浆法。二重管注浆是采用特殊的双重钻杆钻孔,并通过钻杆进行注浆,浆液在钻杆端部的混合器混合,具有钻注一体的特点。针对工程地层条件,选取二重管垂直注浆技术对桩间进行止水处理,介绍了注浆工艺及参数,并对其注浆机理进行了探讨。
Foundation pit excavation is carried out in water-rich sand layers and weakly inhomogeneous formations dominated by fully weathered granite, in order to prevent disasters such as instability, collapse, and piping of foundation pits due to seepage of water in pit walls during excavation, in addition to appropriate In addition to the supporting measures, the perimeter of the foundation pit must be treated with water stoppage to restrict the flow of groundwater into the foundation pit. Commonly used methods of grouting and water sealing include sleeve valve pipe grouting and double pipe grouting. The double pipe grouting uses a special double drill pipe to drill and grouting through the drill pipe. The slurry is mixed in the mixer at the end of the drill pipe, which has the characteristics of drilling and injection. According to the condition of engineering stratum, the double pipe vertical grouting technology was selected to stop the water between piles. The grouting technology and parameters were introduced, and the grouting mechanism was discussed.