Mechanism investigation on coal and gas outburst: An overview

Ma, Yankun; Nie, Baisheng; He, Xiaocong; Li, Xiangchun; Meng, Junqing; Song, Dazhao

doi:10.1007/s12613-019-1956-9

Cited by 117 publications

(54 citation statements)

References 111 publications

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“…where E g is the gas burst energy in kJ; P 0 is the peak pressure of the fission device release in MPa; P is the standard atmospheric pressure, taken as 0.101 MPa; V L is the fission volume in m 3 ; K is the adiabatic index of the medium, taken as 1.295 for liquid CO 2 .…”

Section: Plos Onementioning

confidence: 99%

“…where ρ 0 is the density of liquid CO 2 at a common temperature in kg/m 3 , D 0 is the fissioner burst gas explosion velocity in m/s, k is the adiabatic isentropic index of the burst gas, γ is the adiabatic index of the burst gas, and V H is the volume of the fracturing hole in m 3 .…”

Section: Liquid Co 2 Phase Change Gas Explosion Load Process Analysismentioning

confidence: 99%

“…To increase the rate of gas extraction and ensure safe coal mining, therefore, coal seam penetration enhancement technology is widely used. At present, liquid CO 2 phase change fracturing technology is a relatively safe and reliable method for increasing permeability; it not only increases the permeability of the coal seam and improves the efficiency of gas extraction, but also effectively prevents the spread of gas and prevents coal and gas protrusion [3].…”

Section: Introductionmentioning

confidence: 99%

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Study of the influencing factors of the liquid CO2 phase change fracturing effect in coal seams

Jia

Wang

et al. 2021

PLoS ONE

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To study the influence of different factors on the cracking effect of the liquid CO2 phase transition, the mechanics of coal rock crack extension based on liquid CO2 phase change blast loading were studied. Through the application of simulation software to analyze the influence of coal seam physical parameters (in situ stress, gas pressure, modulus of elasticity and strength of coal) and blasting parameters (fracturing pore size and peak pressure of detonation)on the effect of liquid CO2 phase change cracking, the simulation results showed that the cracking effect of liquid CO2 phase change was positively correlated with the changes in gas pressure, elastic modulus, fracture hole diameter and peak vent pressure, negatively correlated with the variation in situ stress and compressive strength, and nearly independent of the tensile strength. In addition, by using Gray correlation analysis to analyze the influence degree of six main factors on the cracking effect, the calculation results showed that the effect of blasting parameters was greater than that of physical parameters. The main controlling factor that affected the blasting effect was the peak pressure of blasting release. By conducting comparative engineering trials with different blasting parameters, the test results showed that the crack effect of the coal seam was positively correlated with the change in fracture hole diameter and peak venting pressure, which was consistent with the results obtained from the simulation. The experimental results and simulation results for the effective radius of coal seam fracturing were basically consistent, with the error between the two types of results falling below 10%. Therefore, the reliability of the blasting numerical model was verified. In summary, the research results provide theoretical guidance for applying and promoting liquid CO2 fracturing technology in coal mines.

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Section: Plos Onementioning

confidence: 99%

Section: Liquid Co 2 Phase Change Gas Explosion Load Process Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Study of the influencing factors of the liquid CO2 phase change fracturing effect in coal seams

Jia

Wang

et al. 2021

PLoS ONE

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“…Currently, the mechanisms of coal and gas outburst are still in the stage of hypothesis, such as the hypothesis of gas action, ground stress, chemical action, and other single factor hypothesis, which cannot fully explain some special disasters reasonably [5][6][7]. However, in the practical explorations of the mechanism of coal and gas outburst, more and more scholars believe that coal and gas outbursts occur under the combined action of three main factors, namely, gas pressure, in situ stress, and physical and mechanical properties of coal mass [8,9].…”

Section: Introductionmentioning

confidence: 99%

Mechanism and Classification of Coal and Gas Outbursts in China

Zhang

Yang

et al. 2021

Advances in Civil Engineering

Self Cite

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Coal and gas outburst is a kind of complex dynamic disaster with short duration and strong explosiveness, and the modes and strength of the outburst are determined by the in situ stress, gas pressure, and physical and mechanical properties of the coal mass. In this paper, the status quo of research on the mechanism of coal and gas outburst in China is described from three aspects: the controlling effect of single factor, the controlling effect of multi-factor, and new understandings of the outburst mechanism in recent years. Firstly, controlling factors of coal and gas outburst are classified for an in-depth analysis of the main factors of the same type of disasters, and the research progress and new understandings of the mechanism of coal and gas outburst are systematically sorted out. Secondly, the influencing factors of the strength coal mass are analyzed, and the related issues of coal mass strength on coal and gas outburst disaster mechanism are discussed. The results show that the stages of incubation, occurrence, development, and stop on coal and gas outburst are affected by the coupling effects of in situ stress field, gas pressure field, and seepage field, and the coal strength becomes an important factor affecting outburst strength under the same in situ stress and gas pressure. Therefore, the scientific and reasonable improvement methods of such similar simulation experiment devices are proposed according to the existing experimental methods and devices, which is of great significance to provide ideas for the continuous transferring to deep mining and preventing coal and gas outburst in China in the future.

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“…Under deep mining conditions, gas disasters such as coal and gas outburst, gas explosion, and gas suffocation are one of the most frequent and serious disasters (Yuan et al 2020). In order to prevent gas disasters, many scholars have conducted research on the formation mechanism and prevention methods of gas disasters, the disturbance effect of mining engineering, and the seepage characteristics of coal and rock (Gao, Zhang, Yin, et al 2018;Gao et al 2019;Ma et al 2020). Skoczylas (2012) and Wang et al (2011) studied the role of gas in the outburst process.…”

Section: Introductionmentioning

confidence: 99%

Mechanical behaviour and seepage characteristics of coal under the loading path of roadway excavation and coal mining

Xie

Gao

et al. 2021

Geomatics, Natural Hazards and Risk

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The mechanical behaviour and seepage characteristics of coal under the mining engineering disturbance are of great significance to prevent gas disasters. Based on the geological conditions of the No. 12 mine of the China Pingdingshan Mining Group, the mechanical seepage experiments of coal under the stress path of roadway excavation and coal mining were carried out. The experimental result shows that: The coal in fracture zone is most strongly affected by the roadway excavation. The samples showed obvious expansion phenomenon, and their cracks were the most complex. They formed effective permeability before the peak strength, and their permeability was the largest; the coal in disturbance zone is less affected by roadway excavation, and the coal samples formed effective permeability after the peak strength. Their permeability was smaller than the samples in fracture zone; the coal in original rock stress zone is only affected by coal mining, and its crack growth degree is the lowest. The coal samples formed stable permeability in the residual strength stage, and their permeability was the smallest. In practical engineering, special attention should be paid to the sudden gas gushing caused by the sudden increase of coal seam permeability, which will cause gas disaster.

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Mechanism investigation on coal and gas outburst: An overview

Cited by 117 publications

References 111 publications

Study of the influencing factors of the liquid CO2 phase change fracturing effect in coal seams

Study of the influencing factors of the liquid CO2 phase change fracturing effect in coal seams

Mechanism and Classification of Coal and Gas Outbursts in China

Mechanical behaviour and seepage characteristics of coal under the loading path of roadway excavation and coal mining

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