为了解井下煤层受采动作用的影响时原岩应力升降过程中引起的煤体瓦斯渗透性变化规律,利用MYS-Ⅰ型煤岩样渗透率测试系统,通过改变围压和瓦斯压力的方法,对比研究了成型煤样和原煤样渗透率之间的异同。试验结果表明:成型煤样和原煤样之间的渗透率差别很大,数值上相差在一个数量级左右;在瓦斯压力固定的条件下,原煤样渗透率随围压增大而下降的速度比成型煤样要缓慢;成型煤样和原煤样渗透率随围压和瓦斯压力改变的变化趋势基本相同,在实验室用成型煤样代替原煤样用于渗透性试验是可行的,但只能研究大致的变化规律。

In order to analyze the variation law of the seam gas permeability occurred in the rising and dropping of the in-situ rock stress under the influences of th e mining operation, the MYS-I permeability measuring system of coal and rock sample was applied to the comparison study on the permeability difference between the briquette coal sample and the raw coal sample with the method to change the surrounding pressure and the gas pressure.The test results showed that there was a big difference of the permeabllity between the briquette coal sample and the raw coal sample and there was about a quantitative order difference in the numerical value.Un der the condition of the fixed gas pressure, the permeability of the raw coal sample would be reduced with the surrounding rock pressure increased, but the reduction s peed would be slower than the briquette coal sample.The permeability of the briquette coal sample and the raw coal sample would have the same variation tendency wit h the surrounding rock pressure and the gas pressure changed.In the lab, the briquette coal sample would be feasible to replace the raw coal sample for the permeabilit y test, but would be only for the study of the general variation law.

国家自然科学基金资助项目(51004003,50974004)；安徽省教育厅自然科学基金重点资助项目(KJ2010A091)；