中文摘要：

为了解井下煤层受采动作用的影响,原岩应力升高与降低的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对原煤样通过改变围压和瓦斯压力的方法,研究了渗透率与围压和瓦斯压力之间的关系。试验结果表明：围压对煤体渗透率的影响很大;瓦斯压力保持不变时,随着围压的增加渗透率开始下降很快,降到一定程度之后变化缓慢;在围压保持不变时,瓦斯压力与煤样渗透率之间的关系呈＂V＂型关系变化。

英文摘要：

In order to understand the mining role affected to the seam and to understand the variation law of the seam gas permeability occurred in the rising and dropping of the insitu rock stress,a MYS-I permeability test and measuring system of the coal and rock sample was applied to study the relationship between the permeability and surrounding pressure and gas pressure with the method of raw coal sample to change the surrounding pressure and gas pressure.The test results showed that the surrounding pressure would have high influences to the seam permeability.When the gas pressure kept in stable,the permeability rate would be quickly decreased with the surrounding pressure increased and after a certain degree,the permeability drop would be slow.When the surrounding rock kept in stable,When the surrounding pressure kept in table,the relationship between the gas pressure and the coal sample permeability would have a variation in ＂V＂ relationship.