构皮滩水电站厂房进水口边坡主要工程地质问题及处理

Primary Engineering Geological Problems and Their Treatments of the Water-intake Slope of Goupitan Hydropower Station

构皮滩水电站厂房进水口边坡最大开挖高度171 m,地层为二叠系下统茅口组(P1m)和二叠系上统吴家坪组(P2w),以灰岩为主。进水口边坡主要地质问题包括软弱层带、不稳定块体及岩溶洞穴等,施工中对软弱层带等岩体较破碎部位增设钢筋混凝土贴坡加固,对不稳定块体进行挖除锚固,对溶洞回填C20混凝土处理。截至目前,支护效果良好。

The maximum height of excavation for the water-intake slope of Goupitan Hydropower Station is 171 m,the stratum is mostly composed with limestone in Maokou and Wujiaping Formation of the Permian.The primary engineering geological problems of the water-intake slope include weak layers,unstable blocks and karst caves,etc.Reinforced concrete is used for the slope reinforcement at the weak layers,the unstable blocks have been dug away,and the karst caves have been filled with C20 concrete.Up to now,the supporting effect is good.