颗粒破碎对煤矸石渗透性能的影响

采用标准试验方法求得筑坝用煤矸石的最大干密度和相应的最优含水量。试验结果表明,击实作用使煤矸石的粗大颗粒发生破碎,导致其粒度组成改变,颗粒级配进一步趋于良好,有利于碾压密实。当粗粒质量分数大于60%时,煤矸石的破碎程度明显提高。当粗粒质量分数小于40%时,煤矸石的工程特性主要由细颗粒的性质决定。煤矸石的渗透系数和孔隙比之间存在指数关系。随细颗粒含量的增加,煤矸石的渗透性将显著降低。

Grain Breakage Effect on the Permeability Properties of Coal Gangue

Normal test method is employed to explore the relationship between dry density and optimum water content of coal gangue used in daming.The results show that the compaction will change the distribution of grain size,the particle size distribution will be more satisfactory and get a higher degree of consolidation.When the content of coarse grain is great than 60 %,the crush degree is observably increasing.When the content of coarse grain is less than 40 %,the leading engineering characteristic of coal gangue is determined by fine grain.The coefficient of permeability of coal gangue can be defined as an exponential expression of void ratio.With the increasing of fine grain,the penetrability of coal gangue will be clearly lower.