School of Geosciences and Surveying Engineering,China University of Mining and Technology( Beijing)School of Resources and Safety Engineering,China University of Mining and Technology ( Beijing)Henan Provincial Key Labof Gas Geology and Gas Control-Cultivation Base,Provincial and Ministry Joint State Key Lab,Henan Polytechnic University

针对煤的低强度、非均质和对气体的强吸附性等特点,探讨了在煤岩稳态法渗流试验中,型煤是否能够代替原煤和吸附平衡条件对渗透率测量的影响这2个重要问题。分析认为型煤制样是一个将原煤孔裂隙结构破坏、简化的失真重塑过程,因此为了更加真实的探测煤岩的渗透性,建议在渗透试验中尽量使用原煤样。实际的煤层气抽采是一种吸附平衡被逐渐打破的放气式渗流状态,吸附平衡前的渗流测量是一种仅在主渗孔裂隙内发生固-气耦合的充气式测量方式,因此在研究煤岩的吸附性对瓦斯渗流的影响特征时,不建议采用吸附平衡前的稳态渗流测量方法。

A low strength hetergeneity,high gas adsorpton and other featuresof the cal would make the consideration on the two speialissues of thesample preparaton and adsoption epul.run condito in the seepage exceriments with the coal and rock steady state method. /n combination with the previous experiment study results a detail iscussion was conducted that the briquete could replace the raw coal and the adsorption e ali.rum condion could be affeced to the permeabilitmeasurement.T'he paper hold that briquette sample would be a process to destouctre raw ceal porecrack stoucture and to be a reconstrucion ofthe simpe adistorionln order to more acually detect the coal and rock permeabltythe raw coal samples appied to the permeablity experiment were proposed. The acual calbed methanedrainage would be a degasing seepage state with an adsoption epaulirum steadiy broken.Before the adsorption epuillsrunm.the seepage measurement would be a gas-solid coupling infatable measuring method within the major cracks of the pemeability hole. nthe study on the coal and rock dsopio afictedtothe features of te gas seepage,before the adsorption equilbrium,the steady state seepage measuring method could not be recommended.

国家科技重大专项资助项目(2011ZX05040-005)；河南省高校科技创新团队支持计划资助项目(14IRTSTHN002)；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外部开放基金资助项目(WS2013A11)；河南省教育厅科学技术重点研究资助项目(14A440008)；