Experimental study on the confinement-dependent characteristics of a Utah coal considering the anisotropy by cleats

International Journal of Rock Mechanics and Mining Sciences
Bo-Hyun KimSteve Berry

Abstract

Characterizing a coal from an engineering perspective for design of mining excavations is critical in order to prevent fatalities, as underground coal mines are often developed in highly stressed ground conditions. Coal pillar bursts involve the sudden expulsion of coal and rock into the mine opening. These events occur when relatively high stresses in a coal pillar, left for support in underground workings, exceed the pillar's load capacity causing the pillar to rupture without warning. This process may be influenced by cleating, which is a type of joint system that can be found in coal rock masses. As such, it is important to consider the anisotropy of coal mechanical behavior. Additionally, if coal is expected to fail in a brittle manner, then behavior changes, such as the transition from extensional to shear failure, have to be considered and reflected in the adopted failure criteria. It must be anticipated that a different failure mechanism occurs as the confinement level increases and conditions for tensile failure are prevented or strongly diminished. The anisotropy and confinement dependency of coal behavior previously mentioned merit extensive investigation. In this study, a total of 84 samples obtained from a Utah coa...Continue Reading

Citations

Apr 27, 2021·International Journal of Mining Science and Technology·Bo-Hyun Kim, Mark K Larson
Jun 17, 2021·International Journal of Rock Mechanics and Mining Sciences·Bo-Hyun KimSteve Berry

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