水布垭工程页岩风化料级配特性研究

Researches on Decomposed Shale's Gradation Character

清江水布垭水利枢纽挡水建筑物为一高２２７ｍ的心墙堆石坝，其心墙防渗料的主要料源为页岩风化料。土料的级配是影响和评价其工程性质的主要因素之一。对该工程页岩风化料的级配特性的研究表明：页岩风化料的级配具有宽级配、不连续、不稳定的特性。利用页岩风化料的级配不稳定性，可使材料朝着有利于发挥其应起作用的方向变化。由于页岩风化料具有级配不稳定特性，故应以击实或碾压后的级配来测定和评价其物理力学性质。

Shui Bu Ya hydro-project on the Qing Jiang River is a 227 meters high rockfill dam with imperious core , the major material of which is the decomposed shale. Since grain composition is one of the important basic elements in evaluating its engineering properties, so a lot of research work on the gradation character was done. The result shows that the decomposed shale possesses special properties of wide-gradation, discontinuity and instability.Taking advantage of its gradation instability,full play to the matemal funtion can be given. Also, due to its gradation instability,the physical and mechanical properties of decomposed shate should be determined and evaluated after compaction or roller compaction.