Evaluation of Bumps-Prone Potential Regarding the Spatial Characteristics of Cleat in Coal Pillars Under Highly Stressed Ground Conditions
Published on Jun 25, 2017
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Understanding coal rib geomechanics is essential for improving rib stability and eliminating fatality and injury trends due to rib failures. There are presently no standardized rib control practices available in most countries. In light of this observed dearth, this investigation aims to improve understanding of rib failure mechanisms using the distinct element modeling (DEM) technique. DEM is chosen because of its superior advantage to explicitly represent discontinuities and their constitutive...
Abstract The purpose of this study is to explore how the geochemical and petrographic components of coal may impact its physical properties and how these correlate with a history of reportable dynamic failure in coal mines. Dynamic failure events, also termed bumps, bounces, or bursts, are the explosive failures of rock in a mining environment. These events occur suddenly and often with no warning, resulting in worker injury up to and including fatality in greater than 60% of reportable cases th...
Abstract Coal burst is a manifestation of rapid energy release, which is considered as one of the most critical operational hazards in underground coal mines. This study numerically investigates the effects of discontinuities on the strength and energy release characteristics of coal mass samples under uniaxial compression. The universal distinct element code (UDEC) was used to model pillar-scale coal mass samples that were represented by an assembly of triangular deformable blocks, and pre-exis...
Development of a fault-rupture environment in 3D: A numerical tool for examining the mechanical impact of a fault on underground excavations.
Abstract While faults are commonly simulated as a single planar or non-planar interface for a safety or stability analysis in underground mining excavation, the real 3D structure of a fault is often very complex, with different branches that reactivate at different times. Furthermore, these branches are zones of non-zero thickness where material continuously undergoes damage even during interseismic periods. In this study, the initiation and the initial evolution of a strike-slip fault was model...
Experimental study on the confinement-dependent characteristics of a Utah coal considering the anisotropy by cleats
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...