中文摘要：

顺层瓦斯抽采过程中,受采动影响和钻孔周围煤体蠕变等作用,致使钻孔及其周围煤体发生动态变形并产生新的裂隙,增大抽采漏风量,造成抽采瓦斯浓度偏低、钻孔服务时间短,抽采困难与资源浪费等。根据抽采钻孔动态形变规律,应用多孔介质渗流力学和钻孔密封理论研究了以封孔器和密封液相互配合为基础的自适应动态密封关键技术与理论体系。研究表明,通过对钻孔实施动态密封,在20k Pa左右的抽采负压条件下,单孔瓦斯抽采浓度达90%以上,单孔纯瓦斯流量提高2—3倍。

英文摘要：

In the gas drainage of mining-coal seam,the dynamic deformation and new cracks was induced by the mining influence, creep behavior and the other stress in the borehole and surrounding strata, and the formation of secondary air leakage cycle increased the amount of air leakage. The factors reducd the lower concentration of the extracted gas, decreased of flow rate and poor stability, shortened the drilling service time, increased the difficulty of gas extraction, waste of resources, and so on. Based on dynamic deformation regularity of drainage borehole, applying the porous medium flow theory and the theory of borehole sealing a dynamic sealing theoretical system and adaptive dynamic sealing systems. The results showed that under the suction pressure conditions about 20 kPa of the drainage system, the technology would keep the gas concentration constant and ensure 2 - to - 3 - time increase of the concentration for each borehole and an average concentration over 90% . Thus, the extraction efficiency was greatly increased.