A model for the initiation of coal-gas outbursts

Litwiniszyn, J.

doi:10.1016/0148-9062(85)92592-6

Cited by 72 publications

(25 citation statements)

References 5 publications

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“…As previously reported by Zhou and He, 8362 of 8669 outbursts (96.5%) were related to human activities such as drilling, blast mining, or coal dropping [8]. These activities cause vibration that alter the mechanical properties of coal and reduce coal strength [7,9]. To this effect, this paper posits that vibration is a critical factor contributing to instantaneous outburst.…”

Section: Introductionmentioning

confidence: 85%

“…To learn and predict outburst accidents, the factors contributing to outburst have been widely studied for decades. A wealth of hypotheses, such as the dynamic model [1,[3][4][5], the pocket model, spherical shell destabilization model [6], and gas phase transformation model [7], have been proposed to explain this phenomena. No single theory, however, can fully explain all the characteristics of outburst, because the phenomenon is so complex.…”

Section: Introductionmentioning

confidence: 99%

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An Experiment Monitoring Signals of Coal Bed Simulation under Forced Vibration Conditions

Gao

et al. 2015

Shock and Vibration

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An experiment simulating coal seam under forced vibration conditions was conducted. Acceleration response and microseism signal during the experiment were collected and analyzed. It is found that, with an increasing amount of vibration, the natural frequency of the specimen decreases, and this phenomenon reflects fractures appearing in the specimen. Acceleration response signals show that peaks in shock excitation frequency and shock excitation acceleration affect the acceleration response, which reflects damage to the specimen. When shock excitation frequency nears natural frequency, the acceleration response first decreases and then increases. When resonance occurs, it reaches its maximum value. As shock excitation acceleration peaks increase, the acceleration response peak of the specimen also increases. We conclude that destruction is mainly concentrated in the coal seam evidenced by specimen destruction situation. Then shock excitation frequency and shock excitation acceleration influence on microseism signals were analyzed by Hilbert-Huang transform. By receiving these signals and analyzing their characteristics, it is beneficial to develop new methods to predict disasters underground dynamically in the future.

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Section: Introductionmentioning

confidence: 85%

Section: Introductionmentioning

confidence: 99%

An Experiment Monitoring Signals of Coal Bed Simulation under Forced Vibration Conditions

Gao

et al. 2015

Shock and Vibration

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“…However, coalbed methane can also result in great disasters in coal mines [1][2][3][4][5], so the coal seam gas exploitation is imperative. China has a large reserve of coalbed methane, but it is difficult to exploit because the permeability of coal reservoir is very low [6].…”

Section: Introductionmentioning

confidence: 99%

Laboratory measurements of methane desorption on coal during acoustic stimulation

Jiang

Xiao

Líu

et al. 2015

International Journal of Rock Mechanics and Mining Sciences

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“…e mechanism of coal and gas outburst is complicated and there is no consensus conclusion, which is the root cause of frequent outburst accidents and difficulty to effectively control. Nonlinear release of energy storage in coal body is the most direct manifestation of coal and gas outburst [3][4][5][6]. Existing studies show that the elastic energy and gas expansion potential accumulated in gas-bearing coal bodies in the original state are the main energy sources for the occurrence of coal and gas outburst, however, coal and gas outburst generally occur in the coal seam with low strength and serious damage, so the gas expansion potential is much larger than the elastic energy of the coal body, and there is an order of magnitude difference between the two [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on the Release Rule of the Gas Expansion Potential of Loaded Water‐Filled Soft Coal

Qin

Wei

et al. 2019

Mathematical Problems in Engineering

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The aim of this study was to explore the evolution and release rule of internal energy storage in the process of coal and gas outburst and to further reveal the mechanism of coal and gas outburst from the perspective of energy. In this paper, the experiment of gas expansion energy release of coal samples under different adsorption pressures and with different moisture contents was carried out with the self-developed experimental device for release of gas-bearing coal expansion energy under load, and the energy of the whole outburst process was divided into three parts: the total expansion energy of gas, the energy consumed by destroying and throwing out coal body and the energy released inefficiently. On the basis of reasonable assumption, the energy evolution calculation model of each part was constructed with mathematical method. By analyzing the changes and distribution rules of three parts of energy under different experimental conditions, this paper explored the controlling effects of gas pressure, water content, and other variables on the energy evolution rules in the process of coal and gas outburst. Experimental and theoretical studies showed that in the gas-dominated coal and gas outburst process, the destruction of coal body was in the form of stratification; under each experimental condition, there existed a critical gas pressure value for the occurrence of coal and gas outburst, and there was a sudden change of energy evolution near this value; the existence of water made the critical pressure and the minimum energy consumption of coal and gas outburst increase obviously; under the experimental conditions, there was a linear relationship between the critical gas pressure and water content and a positive exponential relationship between the minimum energy consumption and water content.

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A model for the initiation of coal-gas outbursts

Cited by 72 publications

References 5 publications

An Experiment Monitoring Signals of Coal Bed Simulation under Forced Vibration Conditions

An Experiment Monitoring Signals of Coal Bed Simulation under Forced Vibration Conditions

Laboratory measurements of methane desorption on coal during acoustic stimulation

Experimental Investigation on the Release Rule of the Gas Expansion Potential of Loaded Water‐Filled Soft Coal

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