本区出露地层主要有二叠系和三叠系灰岩及页岩(见图1)。岩层倾向上游,走向与河流垂直。由于各层灰岩均已不同程度地发生喀斯特化,作为坝基的一层灰岩(厚200余米),在不同高度上又发现三层大的水平溶洞。并且在两岸各有一大股喀斯特水湧出。因此。研究该坝区的喀斯特水文地质问题,对论证建坝蓄水后的渗漏途径和正确采取防渗措施。是具有现实意义的。 The exposed strata in this area are mainly Permian and Triassic limestone and shale (see Figure 1). The rock formation tends to be upstream and perpendicular to the river. As each layer of limestone has been karst occurred to varying degrees, as a layer of limestone dam (200 meters thick), at different heights and found three large horizontal caves. And there is a large stream of karst water on each side of the Taiwan Strait. therefore. Study on the karst hydrogeological problems in the dam area, and demonstrate the seepage ways after dam construction and water storage and correct measures for seepage control. Is of practical significance.