Experimental research into the relationship between initial gas release and coal-gas outbursts

Yang, Dingding; Chen, Yujia; Tang, Jun; Li, Xiaowei; Jiang, Cheng‐Lin; Wang, Chaojie; Zhang, Chaojie

doi:10.1016/j.jngse.2017.12.015

Cited by 77 publications

(27 citation statements)

References 27 publications

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“…The concentrations registered increased very rapidly. Obtaining the maximum value took from 10 s to 12 s. Similar information can be found in [31]. The dynamics of a methanometer recording is a certain resultant of the metrological properties of a sensor used, the parameters of ventilation, and the geometry of the excavation, as well as the distance from the place of the outburst.…”

Section: Actual Methane Emission During An Outburst and The Model Resmentioning

confidence: 78%

Methane Emission during Gas and Rock Outburst on the Basis of the Unipore Model

et al. 2019

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The goal of this paper is to analyze the phenomenon of gas emission during a methane and coal outburst based on the unipore Crank diffusion model for spherical grains and plane sheets. Two occurrences in the Upper Silesian Coal Basin were analyzed: an outburst in a Zofiówka coal mine in 2005 and an outburst in a Budryk coal mine in 2012. Those two outbursts differed considerably. The first one was connected with an unidentified tectonic disturbance in the form of a triple, interlocking fault, and the other one is an example of an outburst in an area free from tectonic disturbances. The model analysis required laboratory tests in order to determine the sorption properties of coals from post-outburst masses. Sorption isotherms and the values of the effective diffusion coefficient were specified. The post-outburst masses were subjected to sieve analysis and the grain composition curves were plotted. The researchers also used the measurement data provided by proper mine services, such as the methane content, the volume of post-outburst masses, and the time courses of CH4 concentration changes in excavations. They were recorded by methane measurement systems in the mines.

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Section: Actual Methane Emission During An Outburst and The Model Resmentioning

confidence: 78%

Methane Emission during Gas and Rock Outburst on the Basis of the Unipore Model

et al. 2019

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“…The gas adsorption constants a and b, used to quantify the adsorption capacity of coal, were determined by the isotherm adsorption test results using methane of 99.9% purity at 30 • C in combination with the Langmuir equation [6]. The parameter ∆p represents the initial velocity of coal gas diffusion [45]. In this paper, the TDC and the samples 4, 8, 12 and 17 were crushed and grains with the particle size of 0.2 to 0.25 mm were sifted out.…”

Section: Adsorption and Desorption Parametersmentioning

confidence: 99%

Experimental Development of Coal-Like Material with Solid-Gas Coupling for Quantitative Simulation Tests of Coal and Gas Outburst Occurred in Soft Coal Seams

Wang

Xie

et al. 2019

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Solid-gas coupling coal-like materials are essential for simulating coal and gas outbursts and the long-term safety study of CO2 sequestration in coal. However, reported materials still differ substantially from natural coal in mechanical, deformation and gaseous properties; the latter two aspects are common not considered. There is a lack of a definite and quantitative preparation method of coal-like materials with high similarity for future reference. Here, 25 groups of raw material ratios were designed in the orthogonal experiment using uniaxial compression, shearing and adsorption/desorption tests. Experiment results indicated that the coal-like materials were highly similar to soft coals in properties mentioned above. And range analysis revealed the key influencing factors of each mechanical index. The gypsum/petrolatum ratio controls the density, compressive strength, elastic modulus, cohesion and deformation characteristic. The coarse/fine coal powder (1–2 and 0–0.5 mm) controls the internal friction angle and is the secondary controlling factor for compressive strength and elastic modulus. The effect of coal particle size on the sample strength was studied using scanning electron microscope (SEM). When the gypsum/petrolatum ratio increased, the deformation characteristics changed from ductile to brittle. The different failure modes in the samples were revealed. The coal powder content is a key in the gas adsorption/desorption properties and an empirical formula for estimating the adsorption capacity was established. Based on the range analysis of experimental results, a multiple linear regression model of the mechanical parameters and their key influencing factors was obtained. Finally, a composition closely resembling the natural coal was determined, which differs by only 0.47–7.41% in all parameters except porosity (11.76%). Possible improvements and extension to similar materials are discussed. The findings of this study can help for better understanding of coal and gas outburst mechanism and stability of CO2 sequestration in soft coal seams.

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“…Based on the cast distance and particle separation appearance of the scattered pulverized coal, Jiang divided the outburst results into three types: strong outburst (C-type), weak outburst (B-type), and no outburst (A-type): In C-type, the pulverized coal was cast to a greater distance of 5~6 m with apparent separation of the scattered pulverized coal; in B-type, the pulverized coal was cast to a distance of less than 2 m with no particle separation found; in A-type, only a small amount of flow was found when opening the rapid exposure device [5,26]. The outburst results in this work were divided into three types by the above indicators, as shown in Table 1.…”

Section: Outburst Experimental Phenomenamentioning

confidence: 99%

“…Yang et al [5] and Jiang et al [26] believe that an outburst will occur when the potential energy in coal reaches a given value. For this experiment, there is also a critical value for the expansive energy of released gas since it is the only difference in the coal potential energy.…”

Section: Energy Analysis Of the Outburst Experimentsmentioning

confidence: 99%

“…Coal and gas outburst is known as a destructive dynamic disaster in coal mines, which seriously restricts coal production safety [1,2]. Among various existing hypotheses on outbursts, the combined effect hypothesis has been widely recognized, which considers that coal and gas outburst is the result of the combined action of in situ stress, gas pressure, and the mechanical properties of coal [3][4][5], wherein the in situ stress plays a leading role in the emergence and development of outbursts [6].…”

Section: Introductionmentioning

confidence: 99%

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Gas Release Characteristics in Coal under Different Stresses and Their Impact on Outbursts

et al. 2018

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The impact mechanism of in situ stress on outbursts plays a key role in the prevention of outbursts during deep coal mining. The in situ stress may influence the outburst by affecting the gas release intensity according to theoretical analysis, but none of the existing studies have taken into consideration this perspective. To explore whether the influence of in situ stress on gas release in coal is an important reason for stress-induced outbursts, experiments on gas release in coal under different axial stresses and on exposure-induced outbursts with different gases were conducted to respectively study the influence of in situ stress on gas release and the impact of gas release on outburst. The results show that with the increase of stress, the methane release intensity rises by 1~2.4 times and shows an obvious periodicity due to different degrees of fracture development. A small increase in gas release intensity can lead to huge increase in the outburst intensity based on an energy analysis of the outburst experiments, indicating that the gas release intensity is a sensitive physical quantity that influences outbursts. The differences in gas release in coal with different stresses will result in differences in the outburst results based on data from the two experiments, proving that the change in gas release intensity during variations of in situ stress is an important factor for in situ stress-induced outbursts. The research achievements can enrich the impact mechanism of in situ stress on outbursts.

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Experimental research into the relationship between initial gas release and coal-gas outbursts

Cited by 77 publications

References 27 publications

Methane Emission during Gas and Rock Outburst on the Basis of the Unipore Model

Methane Emission during Gas and Rock Outburst on the Basis of the Unipore Model

Experimental Development of Coal-Like Material with Solid-Gas Coupling for Quantitative Simulation Tests of Coal and Gas Outburst Occurred in Soft Coal Seams

Gas Release Characteristics in Coal under Different Stresses and Their Impact on Outbursts

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