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前言下桥水电站位于广西龙江上游河池、南丹、环江三县交界处,是龙江在广西境内最上游的一个梯级。水库原设计正常蓄水位标高335米,坝顶标高340米,为双曲拱坝,最大坝高127米,总库容3.07亿立方米,有效库容2.86亿立方米,装机容量12万千瓦。库区坝址均处于岩溶区,岩溶地质问题复杂。自1970年以来进行了大量的地质测绘和溶洞调查工作,库区坝址完成钻探总进尺10,176米,平硐、斜井掘进2,291米,地下水动态观测达2～4个水文年,两岸溶洞和落水洞进行了人工灌水连通试验的灌水量超过60万立方米,同时还进行了大量的抽水试验。通过大量的工作,初步查明了下桥水电站水文地质工程地质条件的复杂性及其特性,对水库岩溶发育特征及渗漏条件有了一些初浅的认识。
Introduction The Xiaqiao Hydropower Station is located in the upper reaches of Longjiang River in Guangxi Hechi, Nandan, the junction of the three counties, is the most upstream Longjiang in Guangxi a cascade. The reservoir was originally designed with a normal water level elevation of 335 meters and a crest elevation of 340 meters. It is a double curvature arch dam with a maximum dam height of 127 meters and a total storage capacity of 307 million cubic meters. The effective storage capacity is 286 million cubic meters and the installed capacity is 120,000 kilowatts. Reservoir dam site are in karst area, karst geological problems are complex. Since 1970, a large number of geological surveys and cave surveys have been carried out. The total footage drilling completion at the dam site has reached 10,176 meters, adit and incline wells have been dug 2,291 meters, and the groundwater has been dynamically observed for 2 to 4 years. The tunnels have been irrigated with more than 600,000 cubic meters of irrigation water, and a large number of pumping tests have been conducted. Through a great deal of work, the complexity and characteristics of hydrogeological engineering geological conditions of Xiaqiao Hydropower Station have been tentatively identified, and some preliminary understanding of reservoir karst development characteristics and seepage conditions has been made.