Coal pillar’s breaking and fracture development mechanism and numerical simulation
Fei Teng, Minggao Yu, Jiangkun Chao, Zhihui Ma
Abstract
This study explores the influence of a repeated mining process on an upper coal pillar in a close coal seam group. The pillar's breaking and instability processes are emphasized, and the influence of fracture development on the oxidation and spontaneous combustion of coal pillars is revealed. A numerical simulation is used to simulate the dynamic evolution characteristics of stress, displacement of the upper coal pillar, and the numerical results elucidate that the mining of the lower adjacent coal seam is a pressure relief process for the upper coal pillar. The theoretical length of the fracture along the strike of the upper coal pillar is also obtained for the upper coal pillar.
Topics & Concepts
CoalFracture (geology)PillarInstabilityGeologyCoal miningMining engineeringDisplacement (psychology)Computer simulationGeotechnical engineeringSpontaneous combustionMaterials scienceStructural engineeringMechanicsEngineeringWaste managementPsychotherapistPhysicsPsychologyCoal Properties and UtilizationGeoscience and Mining TechnologyRock Mechanics and Modeling