不同变质成因无烟煤孔隙特征及其对瓦斯突出的影响

 煤的孔隙特征是影响瓦斯突出的重要因素。本文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。

Crack Features of Different Metamorphogenic Anthracite and Affected to Gas Outburst

The pore characteristic of coal is an important factor to affect gas outburst. The low-temperature liquid nitrogen adsorption experiments of three different metamorphic causes anthracite were conducted and the pore characteristics were analyzed. A new type of cryogenic liquid nitrogen desorption loop is proposed. The experimental results show that the pore of anthracite is mainly microporous and the main pore type is narrow slit-shaped hole. The pore structure of plutonic metamorphism anthracite is more complex than the regional magmatic thermal metamorphism anthracite's and is prone to gas outburst.