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一、概述(一)坝址区工程地质水文地质特点天桥电站位于山、陕两省之间的黄河干流上,坝址基岩主要是浅海相沉积的中奥陶统石灰岩。由于该统岩石沉积条件复杂,故岩性变化比较大。坝址区的主要构造:河床内略呈向南微倾伏、低序次的平缓复式背、向斜;坝前有穿过左岸黄石崖沟和右岸黑龙洞沟的横河断层(F_1);坝基 O_2~(12)层内有多层软弱夹层(强度低、易风化)等。中奥陶统石灰岩和其下的寒武系石灰岩组成区域性的统一含水层,地下水从补给区
I. Overview (I) Geological and hydrogeological features of the dam site The Tianqiao Power Station is located on the mainstream of the Yellow River between the mountains of Shanxi Province and Shaanxi Province. The bedrock of the dam site is mainly the middle-Ordovician limestone deposited shallowly. Due to the complex conditions of rock deposition, the lithology changes greatly. The main structure of the dam site area: there is a gentle dip and syncline with slight dip and low order to the south in the riverbed; there is the Yalong fault (F_1) passing through the Huangshiya ditch on the left bank and the Heilongdonggou on the right bank; The dam foundation O_2 ~ (12) layer has many layers of weak interlayer (low strength, easy to weathering) and so on. The Middle Ordovician limestone and the Cambrian limestone beneath it form a regional unified aquifer. Groundwater flows from the recharge area