为了掌握下保护层开采后被保护层透气性系数及煤层瓦斯含量变化情况,依据郭庄煤矿与寺河矿二号井煤层的相对位置关系,采用相似材料模拟试验和现场实践相结合的方法,对保护层开采后上覆煤岩透气性系数变化情况进行测定。在模拟采动过程中,上覆煤岩透气性系数的时空变化规律为:由原始的4.40 m2/(MPa2.d)左右,先增至约4.89 m2/(MPa2.d),然后减小至3.91m2/(MPa2.d),接着急剧增大至85.00 m2/(MPa2.d)左右,最后下降并稳定在约28.00m2/(MPa2.d)。现场测试结果表明,透气性系数在开采过程中是一个动态发展的过程,即:原始值—增大—减小—急剧增大—减小—稳定(大于原始值)。

In order to master changes of the protected seam permeability cofficient and coal seam gas content after mining lower-protective seam, according to rel ative location between Guozhuang Mine and No.2 Coal Seam of Sihe Mine, the authors adopted the combination of similar material simulation and field practice, deter mined the changes of overlying strata permeability coefficient after protective seams exploitation, obtained the spatial variation of permeability coefficient of overlying st rata in the mining process:from the original value 4. 40 m2/ (MPa2.d) , increased to about 4.89 m2/ (MPa2.d) firstly, then reduced to about 3.91 m2/ (MPa2.d) , and then rapidly increased to the maximum value 85.00 m2/ (MPa2 d) , and finally reduced to about 28.00 m2/ (MPa2.d) .The results indicated that the permeability coefficient w as a dynamic proces, namely the original value-increase-reduce-sharp increase-steady decrease (more than the original value) .

河南省教育厅自然科学基金资助项目(12A440004)；河南省瓦斯地质与瓦斯治理重点实验室—省部共建国家重点实验室培育基地开放基金资助项目(WS2012B06)；河南理工大学深部矿井建设重点学科开放实验室开放基金资助项目(2011KF-03)；