Abstract
In view of the phenomena of coal and gas outburst induced by fault activation under dynamic disturbance, a mechanical model of faults and surrounding rock mechanics was established based on the theory of fold catastrophe. Moreover, the dynamic disturbance factors were introduced and analyzed to analyze the influencing factors of outburst coal rock outburst. Through theoretical analysis, it shows that the thinner the fault medium is, the more energy the external input is required for system instability, and the external energy can reflect the stability of the system. When the width of fault media is fixed, the stronger the mining disturbance, the less energy the external input is required for system instability; on the contrary, the weaker the mining disturbance is, the more energy the external input is required for system instability. In addition, through the equation of conservation of kinetic energy, it can be seen that the stronger the mining disturbance, the greater the critical value of the surrounding rock thickness. The paper introduces the dynamic disturbance parameters through the catastrophe theory and analyzes the influence of the existence of faults on coal and gas outburst in detail, which provides a new theoretical basis for the prediction and prevention of coal and gas outburst disasters.
Highlights
Coal gas outburst is a complex, short-term dynamic phenomenon caused by many factors, including geological structure, mechanical properties of coal, gas pressure, and external force. e role of gas is to generate tensile stress.e influence of faults on the coal and gas outburst in the belt is a major dynamic disaster affecting the safe mining of coal mines. e cause is often induced by fault activation caused by dynamic disturbance during mining [1,2,3,4,5]
Based on the specific conditions, this paper introduces the concept of mining disturbance through macroscopic mechanics and discusses the relationship between dynamic disturbance and fault width, width of fault surrounding rock, and external energy through the catastrophe equation
A fault-rock system based on catastrophe theory is established. e conditions of system instability and even outburst under the conditions of dynamic disturbance are analyzed
Summary
Coal gas outburst is a complex, short-term dynamic phenomenon caused by many factors, including geological structure, mechanical properties of coal, gas pressure, and external force. e role of gas is to generate tensile stress. At the same time, based on the actual engineering analysis, the researchers proposed that coal and gas outburst are mainly affected by small geological structures, coal thickness and its changes, and the occurrence of coal and gas in the mining area and the corresponding outstanding law [14, 15]. E mechanism of coal and gas outburst accidents caused by fault activation under dynamic disturbance is complex, and the occurrence of prominent accidents is affected and restricted by many factors. From the gestation to the excitation, the starting process has the characteristics of abrupt changes It is the disturbance of the gas-bearing coal-rock system under the open conditions, due to the disturbance of the external mining activities, and controlled by the nonlinear dynamic mechanism inside the system. Many scholars have done a lot of research work on the phenomenon of faults caused by faults, such as the theory of fault-induced earthquakes [33] and the pressure of fault activation induced by fault activation [34, 35]. erefore, some of the theories cited in this paper are mostly based on rock, but the physical and mechanical properties of coal and rock mass are quite different, and further research is needed
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