采用恒温煤粒瓦斯放散试验方法,研究了构造煤和原生煤瓦斯放散过程的差异性,结果表明构造煤在瓦斯放散初始1 min的瓦斯解吸量是原生煤的2. 15～4. 06倍,构造煤趋近极限瓦斯解吸量所需时间不足原生煤所需时间的25%,原生煤的极限瓦斯解吸量略高于构造煤,构造煤与原生煤对典型瓦斯放散数学表达式的适用性存在很大不同。为解释试验结果,采用压汞法和低温氮吸附法对煤的孔隙结构进行测试,分析得到中孔及大孔分布是导致构造煤和原生煤瓦斯放散特征差异的主要因素,大分子结构等其他因素对瓦斯放散特征的影响有待于进一步研究。

The gas emission experiments of coal particles at a constant temperature were conducted to study the differ- ence of gas emission between tectonic coal and original coal. Results show that the amount of gas emission of tectonic coal in the first one minute is 2. 15 -4. 06 times of original coal. The time required to reach the full amount of gas emission by tectonic coal is 25% less than that of original coal,and the full emission amount of original coal is slightly higher than that of tectonic coal. The mathematical expressions which can represent the gas emission of tectonic coal and original coal are different. To explain the experiment results,the pore structures of coal were tested by the mercury intrusion and the low temperature nitrogen adsorption methods. Analysis shows that the distribution of mesopore and macropore is the main factor inducing the difference of the gas emission characteristics between tectonic coal and origi- nal coal. Other influencing factors need to be investigated such as macromolecular structure.