纳米仿钢纤维混凝土在不良地质洞段的运用

Application of Nano Steel-wire-like Fiber Concrete in Tunnel Section with Poor Geological Conditions

溧阳抽水蓄能电站尾水主洞位于整个电站的最低点,不具备先行排水、降水的条件,洞室将穿越大小断层几十处,尤其进入富水洞段后,围岩在地下水的作用下稳定性极差,极易发生塌方,采用喷射常规混凝土很难快速封闭围岩。为确保洞室安全,采用纳米仿钢纤维喷射混凝土,经过在几个富水、塌方洞段试验及运用,表明其可迅速封闭围岩,达到止水效果,发挥支护作用,为工程安全、快速施工提供了保障。

The tailwater tunnels in Liyang Pumped-storage Power Station are located in the lowest position of whole station, so there is no condition for pre-drainage. The tunnels will pass through dozens faults, particularly when it pass through the area with rich groundwater, the stability of surrounding rocks will be very poor and easy to occur rock slide. The conventional shotcrete is difficuh to enclose the rocks quickly, so the nano steel-wire-like fiber shotcrete is used in such sections to ensure the tunnel stability. The experiments and applications of nano steel-wire-like fiber shotcrete in several sections with rich groundwater and rock slide show that it can quickly enclose surrounding rocks, seal water seepage and support surrounding rocks. The nano steel-wire-like fiber shotcrete provides a guarantee for secure and fast tunnel excavation.