福建省闽清县昌溪水库为粘土心墙堆石坝,最大坝高45米,总库容量650万方米。坝址河谷呈“V”型,底宽约20米,两岸陡峻,比较对称。坝基为上侏罗统长林组凝灰质中粒长石石英砂岩和泥质粉砂岩相间。顺河向和垂直河流两组陡倾角裂隙极其发育,张开约0.2—5厘米,互相切割成网格状块体,且多有夹泥层,倾向左岸,稍倾上游,倾角10°—15°。还有一条宽6—8米极其破碎的断层,横过河床,倾向上游,倾角近垂直,位于粘土心墙下游代料区内,坝轴线上游左岸心墙 Changxi Reservoir in Minqing County, Fujian Province is a clay core rockfill dam with a maximum dam height of 45 meters and a total reservoir capacity of 6.5 million cubic meters. Dam valley was “V” type, the bottom width of about 20 meters, both steep, more symmetrical. The dam foundation is composed of tuffaceous middle-grained feldspar quartz sandstone and argillaceous siltstone in Upper Jurassic Changling Formation. The steep-dipping fissures along the river and the vertical rivers are extremely well developed. They are about 0.2-5 cm wide and are cut into grid-like blocks each other. There are also many mud layers that tend to leftward and slightly inclined upstream, with a dip angle of 10 ° -15 °. There is a 6-8 m wide crushed fault, across the riverbed, tend to the upper reaches, nearly vertical dip, located in the downstream area of ​​the clay core wall substation, the left bank of the dam center axis wall