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一、前言在陕西渭北石灰岩地区建坝,由于灰岩岩溶裂隙发育,透水性大,加之地下水位低,其渗流场的表现坝体以垂直渗流为主;坝基地下水以水平渗流为主;坝基地下水位以上则为非饱和渗流区。羊毛湾水库即为一典型事例。羊毛湾水库位于陕西省乾县漆水河上,是一座以灌溉为主的大(二)型水库。大坝为碾压式土坝,坝高47.6m,坝顶高程为646.6m,河床高程599.0m。水库工程于1958年10月动工修建,1962年4月停建,1966年10月复工续建,1973年5月建成。大坝建成蓄水以来,坝体陆续发生纵向裂缝,最长达230m,最宽6cm。坝右肩背水坡脚严重漏水范围长113m,个别
I. Introduction In the Weibei limestone area of Shaanxi Province, due to the development of limestone karst fissures and large permeability, combined with the low groundwater level, the performance of the seepage field is dominated by vertical seepage. The groundwater in the dam foundation is dominated by horizontal seepage. The dam foundation The above groundwater level is unsaturated seepage area. The wool bay reservoir is a typical example. Located on the lacquer River in Qianxian, Shaanxi Province, the wool bay reservoir is a large (type II) reservoir mainly irrigated. The dam is a roller compacted earth dam with a dam height of 47.6m, a crest elevation of 646.6m and a river bed elevation of 599.0m. The reservoir project started construction in October 1958, stopped construction in April 1962, resumed construction in October 1966 and completed in May 1973. Since the completion of the dam water storage, the vertical cracks in the dam body, the longest up to 230m, the widest 6cm. Dam right shoulder water slope foot water leakage of a long 113m, individual