砾石土渗透稳定特性试验研究

目前砾石土被广泛地用作高土石坝中的防渗体，国内已建成的187 m高的瀑布沟堆石坝就是用它作心墙的防渗材料。介绍了瀑布沟心墙土料的渗透稳定试验结果，并论述了确定砾石土渗透稳定性能的的主要因素是细粒含量，提出了确定粗、细粒料的区分粒径、计算最优细料含量以及用细料含量判别渗透稳定性的方法。试验结果表明，工程中常以小于5 mm粒径含量不小于35%、小于0.1 mm的粒径含量不小于18%，以判别砾石土能否作为高土石坝防渗体的标准是可行的，无需另外要求小于0.005 mm的粒径含量大于10%。

Research on seepage stability experiment of gravelly soil

Gravelly soil has been widely used as impervious material in high earth-rock dam in recent years.Taking the 189m high Pubugou rockfill dam for example,the seepage stability experiment in the core wall material of Pubugou dam is described.The experiment results indicate that the content of fine material is the main factor which determined the seepage stability.Ways to distinguish fine-grained soil from coarse-grained soil,to calculate the optimal fine material content,and to judge the seepage stability by fine material content are also compared.The test result addresses the assessment is valid that the gravelly soil can be the impervious body of a dam that which requires the content of grain size less than 5mm is more than 35% and grain size less than 1mm is more than 15%,while it is not regarded as an precondition that the grain size less than 0.005mm have to be more than 10%.