Abstract
Based on the theories of the gas seepage in coal seams and the deformation of the coal-rock medium, the gas seepage field in coal-rock mass is coupled with the deformation field of the coal-rock mass to establish a fluid-structure interaction model for the interaction between coal gas and coal-rock masses. The outburst process in coal-rock masses under the joint action of gas pressure and crustal stress is simulated using the material point method. The simulation results show the changes in gas pressure, velocity distribution, maximum principal stress distribution, and damage distribution during the process of the coal and gas outburst, as well as the movement and accumulation of coal-rock masses after the occurrence of the outburst. It was found that the gas pressure gradient was greatest at the working face after the occurrence of the outburst, the gas pressures and pressure gradients at each location within the coal seam gradually decreased with time, and the damage distribution was essentially the same as the minimum principal stress distribution. The simulation further revealed that the outburst first occurred in the middle of the tunnel excavation face and that the speed at which particles of coal mass were ejected was highest at the center and decreased toward the upper and lower sides. The study provides a scientific basis for enhancing our understanding of the mechanism behind coal and gas outbursts, as well as their prevention and control.
Highlights
The combined action hypothesis, which has gained the recognition of several researchers, posits that coal and gas outbursts result from the combined action of factors, such as the crustal stress, gas pressure contained within the coal mass, and physical and mechanical properties of coal
The material point method (MPM) was introduced to simulate the process of coal and gas outbursts and to analyze properties after the occurrence of outbursts, such as the accumulation of coal-rock masses, damage distribution, changes in gas pressure, velocity distribution, and maximum principal stresses, all of which are significant for the further understanding of the mechanism driving coal and gas outbursts, as well as the effective prevention of coal and gas outbursts
The pressure inside the coal seam is relieved, and the gas pressure drops at all points
Summary
The outburst of coal and gas is among the most serious coal mining accidents worldwide [1,2], and seriously jeopardizes the occupational safety of coal mine workers. The nonlinear nature of changes in permeability during the fracture of coal-rock masses was considered to establish a model based on the basic theories behind gas seepage and the deformation of coal-rock masses for the fluid-structure interaction between coal and gas during the outburst process On this basis, the MPM was introduced to simulate the process of coal and gas outbursts and to analyze properties after the occurrence of outbursts, such as the accumulation of coal-rock masses, damage distribution, changes in gas pressure, velocity distribution, and maximum principal stresses, all of which are significant for the further understanding of the mechanism driving coal and gas outbursts, as well as the effective prevention of coal and gas outbursts
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