不同块度煤系软岩崩解性室内试验研究

Laboratory Experimental Study of Slaking Characteristics of Coal Measure Strata Soft Rock

煤系软岩遇水易软化崩解,基于不同块度煤系软岩的崩解性室内试验,探讨了干湿循环作用下煤系软岩耐崩解性指数和崩解物粒径分布的变化规律,并分析了产生崩解的原因。试验结果表明:(1)随着干湿循环次数的增加,煤系软岩耐崩解性指数呈指数关系降低,且降幅主要发生于前3次循环,并以第一次干湿循环所致降幅最大;(2)不同块度煤系软岩的崩解物均可定名为级配不良砂,其中0.5～5 mm粒径的颗粒含量能较为清楚地反映煤系软岩崩解进程,故建议该粒径范围作为评定煤系软岩崩解稳定的标准之一。

Due to the coal measure strata soft rock is prone to softening and disintegrating,based on the test of collapsing in laboratory of different block of coal measure strata soft rock,the slaking durability index and the variation of shape and size of slaking pieces of soft rock under wet and dry cycles were discussed,and the reason of disintegration was analysed. The results are as follows: ( 1) the decrease of coal measure strata soft rock slaking durability index follows an exponent relationship with the increase of slaking cycle times. The index was mainly decreased in previous three cycles,the largest decline is caused by first circulation. ( 2) The slaking pieces of different block of coal measure strata soft rock can be named as bad graded sand. The grain contents between 0.5mm~ 5mm could reflect the rate and degree of slaking obviously,so the above particle size range is suggested to be an evaluate standard to the slaking stability of coal measure strata soft rock.