溧阳抽水蓄能电站前期洞室施工经验总结

Summary of Advanced Cavern Construction Experiences in Liyang Pumped-storage Power Station

溧阳抽水蓄能电站地质条件复杂,地下水丰富,围岩类别以Ⅳ、Ⅴ类为主。进厂交通洞等前期洞室施工中,在大量使用钢拱架、小导管的情况下,仍发生了一定规模的塌方近40次,其施工难度是罕见的。通过采取超前地质预报、超前排水、超前支护、短进尺、弱爆破、及时强支护等综合处理措施,目前各洞室均已完成开挖支护。

The geological conditions in Liyang Pumped-storage Power Station is complex, the groundwater is abundant, and the surrounding rocks is mainly classified as Class IV and V. During advanced cavern excavation, including access tunnel, about 40 rock slides are occurred even if a large number of steel arches and small ducts are used as support. By taking comprehensive treatment measures, such as advanced geological forecast, advanced drainage, advance support, short footage, weak blasting and strong support timely, the excavation and support of caverns have been completed.