Numerical Investigation of Coal and Gas Outbursts under Different In Situ Stresses and Gas Pressures and the Physical Characteristics of Coal

Abstract

The coal and gas outbursts are recognized as a worldwide difficulty, and there is still ample research space in this field, especially on the mechanical mechanism of outbursts. The main purpose of this paper is to attempt to reveal the outburst mechanism as fully as possible from the point of view of mechanics. In this paper, a mechanical model on coal and gas outbursts including the governing equations of gas desorption–seepage, the stress state in the coal sample, and the criteria of coal sample failure and outburst evolution is put forward according to the porous media seepage theory and elastic theory. Based on the proposed model, the variation and distribution of the gas state and stress state in the coal sample in the outburst are analyzed quantitatively and a series of detailed discussions are conducted in terms of the in-situ stress, gas pressure, and the physical characteristics of coal in outbursts. The results of theoretical analysis and numerical simulation show that the stress concentration in the front of the outburst cavity is the main reason for the failure of the coal sample in this area, and then, the drag force caused by gas flow provides energy for the movement of the crushed coal sample, which leads to the outburst cavity expansion and the increase of stress concentration factor. The end of the outburst is because the gas velocity is less than the threshold friction velocity of the crushed coal sample. Additionally, the outburst strength increases with the increase of the vertical in-situ stress and initial gas pressure and decreases with the increase of the internal friction angle and cohesion of coal.

Stress-Electromagnetic Radiation (EMR) Numerical Model and EMR Evolution Law of Composite Coal-Rock under Load

“…Coal-rock dynamic disaster is always accompanied by the deformation and failure of coal-rock under load, so the perception of coal-rock stress state will be beneficial to prevent disasters. At present, a large number of scholars in various countries have gradually explained the corresponding relationship between coal-rock stress state and its failure − and further established the mathematical model between external factors and fracture state at the same time . These results have theoretical significance for the prevention of coal and rock dynamic disaster and could further reveal the mechanical process and instability mechanism of composite coal-rock under load.…”

Deformation and Failure Characteristics of Strong–Weak Coupling Structures with Different Height Ratios Under Cyclic Loading and Unloading

“…For example, the deformation and failure characteristics of strong–weak coupling structures with different height ratios (HRs) under the disturbance of periodic mining stress is still unclear. The coal roadway is subject to periodic stress disturbance during working face mining, resulting in deformation, damage, and even failure, , and the instability and damage of the roadway are the prerequisites for the occurrence of outbursts in mining . The layout parameters of the strong and weak zones may directly affect the overall failure process of the strong–weak coupling structures and thus influence the outburst prevention effect.…”