在农田基本建设群众运动中,水力冲填坝发展很快。陕晋黄土地区兴修了大量的水力冲填的均质黄土坝。目前利用各种当地土料用水力冲填法修建的均质砂坝、粘土心墙砂壳坝、砾质土匀质坝及砾质土心墙坝等亦相继出现。我区砾质壤土及砾质粘土,多属于砂页岩风化的坡残积土。这类土的颗粒组成具有粉粒含量少,砂、砾含量高,并含有一定数量粘粒的特性。粘粒含量过高,冲填后不易排水固结;砂、砾含量过高,不利于防渗。由于我区的坡残积粘土,一般具有团粒结 In the farmland capital construction mass movement, the rapid development of hydraulic impact dam. Shaanxi and Shanxi loess area built a large number of hydraulic fill homogeneous loess dam. At present, various types of local materials such as homogeneous sand dams, clay core wall sand dams, gravelly soil homogenous dams and gravelly soil core dams have also emerged one after another. Gravel loam and gravel clays in our area mostly belonged to the weathered slope debris of sand shale. The composition of such soil particles with less powder content, sand, gravel content, and contains a certain number of clay properties. Clay content is too high, after filling is not easy to drain after consolidation; sand, gravel content is too high, is not conducive to seepage. Due to the slope residue clay in our area, there is usually a mass of grain