In a group of deep coal seams, mining of upper multilayers generates cyclic loading–
unloading stresses in bottom layers, improving their permeability and enhancing coalbed …

In situ capture of crack network evolution is extremely difficult but necessary in fundamental
research on mining mechanics and coalbed methane extraction. Systematic field monitoring …

High gas mines and outburst mines contribute to more than 30% of the coal production
capacity in China. In view of this, coordinating the development and use of coal and gas has …

Mining industries worldwide have inevitably resorted to exploiting resources from the deep
underground. However, traditional mining methods can cause various problems, eg …

The depth of coal mining increases continuously owing to the exhaustion of the shallow coal
resources. How-ever, the technical difficulties which occur during deep coal mining cannot …

Coalbed methane is a lucrative energy source, but its development relies heavily on the
fracturing of coal seam and underground extraction during mining. This study of mining …

To understand more about damage, failure, and transformation of coal, this paper performed
triaxial loading tests on coal samples obtained from a deep coal mine in China. Results …

In the current study, a series of laboratory triaxial loading and unloading experiments were
conducted for the purpose of comprehensively understanding the effects on sandstone of …

The research of gas-water two-phase flow is significant for gas extraction and CBM in deep
coal rock, so a triaxial seepage test system for gas-water two-phase in coal rock is …

In this study, four types of coal samples (complete, parallel fracture, vertical fracture, and
inclined fracture) were prepared, and four mining stress paths were designed. Cyclic loading …