抽水蓄能电站输水发电系统衬砌型式研究

Lining Type of Water Transmission and Power Generation System in Pumped-storage Power Station

金寨抽水蓄能电站输水发电系统沿线山体雄厚,洞室围岩岩性主要为文家岭组上段黑云钾长片麻岩、二长片麻岩,围岩类别以Ⅲ类、Ⅱ类为主,局部为Ⅳ类。从输水线路岩体最小覆盖厚度,最小主应力和最小围岩渗透三个方面,对输水系统衬砌型式选择进行了分析评价。结果表明:输水发电系统从引水竖井高程420 m以下洞段及引水岔、支管部分采用钢板衬砌更为合理、安全、可靠,其余洞段可采用钢筋混凝土衬砌。

The mountains along the water transmission and power generation system of pumped-storage power station of Jinzhai are abundant.The lithology of the cavern chamber is mainly black cloud potassium long gneiss and second long gneiss in the upper section of Wenjialing Group,and the rock type of the cavern is mainly TypeⅢand TypeⅡ,and locally TypeⅣ.The selection of lining type of water transmission system is analyzed and evaluated through several aspects such as minimum coverage thickness of rock body,minimum principal stress criterion and permeability criterion of surrounding rock along the water transmission line.The results show that it is more reasonable,safe and reliable to use steel plate lining for the cave section below 420 m in elevation from the diversion shaft and the diversion bifurcation and branch pipe of the water transmission and power generation system,and the rest of the cave section can be lined with reinforced concrete.