A Multiscale Structural Analysis of Soft and Hard Coal Deposits in Deep High-Gas Coal Seams

In recent years, with the increases in coal mining depths, risk of seam outburst occurrences has increased. Therefore, it is major significance to study multiscale structures soft and hard deposits order prevent control gas outbursts. this research investigation, were comprehensively examined using various laboratory methods. The results revealed following: (1) From a macrostructural aspect, physical mechanical properties weaker than those coal. It was found that majority specimens characterized by scaly without blocks larger 50 mm. observed be mainly massive only small part being clastic. structural characteristics considered stable. (2) microstructural perspective, surfaces rough. pores more developed, edge hackly. At same time, fractures also relatively showing good connectivity. (3) micropore BET-specific surface areas BJH-specific higher specimens, which indicated adsorption diffusion migration abilities greater (4) suggested from ventilation extraction processes should strengthened activities seams high, stratification content. methods used for water injection modification enhanced improve stability Consequently, instantaneous released gases will decelerated, events mine working faces can prevented.