不同变质成因无烟煤孔隙特征及其对瓦斯突出的影响

Crack Features of Different Metamorphogenic Anthracite and Affected to Gas Outburst

煤的孔隙特征是影响瓦斯突出的重要因素。文章对三种不同变质成因的无烟煤进行了低温液氮吸附实验,分析了不同变质成因无烟煤的孔隙特征,提出了无烟煤低温液氮脱附回线区别于烟煤的新的脱附回线类型。实验结果表明:无烟煤的孔隙主要以微孔为主,孔隙类型主要为狭窄的缝形孔;深成变质作用无烟煤的孔隙结构要比区域岩浆热变质作用无烟煤的孔隙结构复杂且易发生瓦斯突出。

The crack features of coal were the important factors affected to the gas outburst. Low temperature liquid nitrogen adsorption experiments were conducted on three different metamorphogenic anthracites. The crack features of the different metamorphogenic anthracites were analyzed. The low temperature liquid nitrogen desorption loop of the anthracite would be distinguished by a new desorption loop of the anthracite. The experiment results showed that the cracks of the anthracite were micro pores mainly and the crack type was a narrow seam pore mainly. The crack structure of the deep metamorphism anthracite would more complicated than the crack structure and more easy gas outburst occurred than of the anthracite with regional magma thermal metamorphism.