王圪堵水库位于陕西省横山县无定河上游,设计坝高38米,拟采用水力拉砂均质坝。坝基和坝体均由不均匀系数小于10的细砂和极细砂组成,其颗粒级配见图1曲线①～④由于该地区缺乏反滤材料,我们考虑用透水混凝土滤层保护细砂和极细砂。目前采 Located in the upper reaches of Wudinghe, Hengshan County, Shaanxi Province, Wangjiage Reservoir is designed to be 38m high with a hydraulic pull-sand homogeneous dam. The dam foundation and the dam body are composed of fine sand and fine sand with a nonuniform coefficient of less than 10, and their grain sizes are shown in Fig.1 Curve ① ~ ④ Because of the lack of filter material in this area, we consider using pervious concrete filter layer to protect fine sand and Very fine sand. Currently mining