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一、前言塑料薄膜应用于土坝防渗,在我省还是初次。1987年4月,我市在外塘水库改建了全省第一座塑料薄膜防渗坝。该库属小(二)型水库,1952年动工,后经逐年续建加高,至1962年初步建成,正常蓄水量15.2万m~3,灌溉面积1000亩。该坝高15m,坝顶长88m,坝顶宽3.5m,全坝由砂壤土填筑而成。虽然坝中设有心墙,但土料不纯,质量很差,碾压不实,起不到防渗的作用。当坝体建成蓄水后,坝面散浸,出逸点很高,从坝高12.7m开始向下全面渗漏,逐年扩大。经测算下游坝面集中渗漏有十余处,散浸面积达404.9m~2,占下游坝面
I. Introduction Plastic film used in earth dam seepage, or in our province for the first time. April 1987, the city in the outer pond reservoir reconstruction of the province’s first plastic film leaking dam. The reservoir is a small (two) reservoir, started in 1952, after a year continued to build high, to 1962 initially completed, the normal water storage capacity of 152,000 m ~ 3, irrigation area of 1,000 acres. The dam height 15m, crest length 88m, crest width 3.5m, the dam is made of sand loam fill. Although the dam has a heart wall, but the material impure, poor quality, laminated compaction, impermeable to play the role. When the dam is built, the surface of the dam is soaked and discharged that the discharge point is very high. From the dam height of 12.7m, it begins to leak downwards and expands year by year. It is estimated that there are more than ten spots of seepage in the downstream dam surface, and the scattered dipping area reaches 404.9m ~ 2, accounting for the downstream dam surface