贵州省三宝水库岩溶发育特征与规律研究

Study on karst development characteristics and law of Sanbao reservoir in Guizhou

三宝水库位于贵州省晴隆县三宝乡境内,库区出露地层为三叠系下统夜郎组,是一套潮下带、潮间带为主的半局限台地沉积,以粘土岩和灰岩互层为主,岩溶十分发育。工程区f1、f2小型断裂穿库区而过,水文地质条件十分复杂。水库自1961年建成后至今未能正常蓄水,针对水库现状,在大量工程地质测绘、调查、走访、钻探、物探等技术手段基础上,对三宝水库区域水文地质条件进行分析研究,结果表明,工程区岩溶洼地、岩溶管道和落水洞现象较为普遍,主要分布于T1y2-4层位,岩性以灰至深灰色中厚层夹厚层灰岩为主,岩溶发育良好,形成穿越库区的岩溶管道,是水库至今无法正常蓄水的根本原因。为后续解决水库渗漏问题和水库成库条件评价提供了方向和依据。

Sanbao reservoir is located in the territory of Guizhou province Qinglong County Township Sanbao,reservoir strata are the lower Triassic Yelang group,is a set of subtidal and intertidal zones of semi restricted platform deposition,the clay rocks and limestones interbedded,the karst is very developed. The small fracture of f1 and f2 in the engineering area passes through the reservoir area,and the hydrogeological conditions are very complicated. The reservoir has not been properly impounded since it was built in 1961,in view of the present situation of the reservoir,the hydrogeological conditions of the Sanbao reservoir are analyzed and studied on the basis of a large number of engineering geological surveys,surveys,visits,drilling and geophysical prospecting. The results show that the project area karst depressions,karst pipes and sinkholes is a common phenomenon,mainly distributed in the T1 y2-4 horizon,lithology of the thick layer of gray to dark gray with thick layer of limestone,karst,formation of karst pipeline through the reservoir area,is the root cause of the reservoir has been unable to normal water level. It provides the direction and basis for further solving reservoir seepage problem and reservoir formation condition evaluation.