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粉细砂地层砂层松散,无粘聚力,自稳能力很差,在该地层中开挖隧道极易发生涌水、涌砂、塌方等工程灾害,因此含水粉细砂地层的施工,是岩土工程界的一大难题。结合工程实际介绍未成岩地层中隧道施工技术,并按照“先降水、管超前、严注浆、短进尺、强支护、早封闭、勤测量、紧衬砌”的施工原则,着重介绍粉细沙岩含水地层斜井和交岔口段进行降水及开挖的施工技术。
Fine silt sand formation loose, no cohesion, self-stability is poor, in the formation of tunnel excavation prone to water gushing, sand, landslides and other engineering disasters, so water-bearing fine sand formation is rock A major problem in the soil engineering. Combined with engineering practice, the tunnel construction technology in immature diagenesis is introduced. According to the construction principle of “first precipitation, advanced pipe, strict grouting, short footage, strong support, early closure, ground measurement, tight lining” Construction Technology of Precipitation and Excavation for Silt and Cross Section of Fine Sandstone Aqueous Stratum.