Laboratory study of the phenomenon of methane and coal outburst

Skoczylas, Norbert

doi:10.1016/j.ijrmms.2012.07.005

Cited by 103 publications

(46 citation statements)

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“…If we assume that the typical porosity of hard coals is between 5 and 10% (Rodrigues and Lemos de Sousa 2002;Bukowska et al 2012;Ramandi et al 2016), then-for the typical values of Fig. 7 Changes in the pressure ∆p inside the measuring chamber, caused by the comminution of the four samples which differ the most when it comes to their gas content the seam pressure, i.e., 0.2-0.6 MPa (Skoczylas 2012)-the amount of methane in free state shall fall in the range of 0.067-0.400 cm 3 /g (the upper limit of this range concerns the coal displaying the highest porosity, under the highest pore pressure).…”

Section: Discussionmentioning

confidence: 99%

“…In particular, gaso-geodynamic hazards (including outburst hazards), linked to the co-occurrence of a solid and gaseous resource, are predominantly connected with the coal-methane system. During an outburst, the gas accumulated in the pore structure of a rock does work by comminuting the rock material and transporting it down the excavation (Beamish and Crosdale 1998;Cao et al 2001;Topolnicki et al 2004;Skoczylas 2012;Wang et al 2013;Jiang et al 2015). With the specific needs of the coal mining industry in mind, various research methods have been developed, which make it possible to evaluate the methane content of a given coal seam (Szlązak and Korzec 2016).…”

Section: Introductionmentioning

confidence: 99%

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Balancing the amount and composition of gas contained in the pore space of cupriferous rocks

Kudasik

Skoczylas

2018

Environ Earth Sci

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From the perspective of economy and safety, balancing gas contained in the pore space of rocks is extremely essential, predominantly to establishments dealing with extraction of mineral resources. One of the main methods of evaluating the amount and composition of gas contained in the pore space of a rock is releasing the gas as a result of comminuting the investigated rock material. In the case of cupriferous rocks, effective comminution is a very difficult task, due to the strength properties of these rocks. The present paper discusses the results of studies into the gas content of cupriferous rocks, obtained by means of an original device named the GPR analyzer. The research was done on 41 samples of dolomites and anhydrites from various areas of two copper mines located in Poland: "Rudna" and "Polkowice-Sieroszowice." For all samples, on the basis of microscope analyses performed on cuts and polished sections, the open porosity, closed porosity, and total porosity were determined. In the case of the dolomite samples, the total porosity variability fell in the range of 4.75-23.05%, and in the case of the anhydrite samples-in the range of 3.87-16.60%. The maximum gas content of the dolomite samples was 166.67 cm 3 /kg, and of the anhydrite samples-84.66 cm 3 /kg. In some of the studied samples, the presence of methane was confirmed. Toxic gases, such as H 2 S, were not found. The main gas in the pore space of the investigated rocks was nitrogen. Knowing the amount of the released gas and the value of the closed porosity in the investigated samples, the authors were able to estimate the pore pressure of the gas, whose maximum value was 0.583 MPa.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Balancing the amount and composition of gas contained in the pore space of cupriferous rocks

Kudasik

Skoczylas

2018

Environ Earth Sci

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“…The device was applied to study the influence of moisture content on the outburst, and the results showed that when the water absorption rate is higher than 3%, the outburst-type fracture formation is impossible [11]. Sobczyk et al constructed a self-development two-dimensional load test equipment, then carried out a series of experiments to study the relationship between the uniaxial compressive strength, gas pressure and the outburst risk [12][13][14]. Peng et al used outburst test equipment to analyze the influence of permeability and non-uniform loading, gas pressure and moisture content [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Experimental Research on the Impactive Dynamic Effect of Gas-Pulverized Coal of Coal and Gas Outburst

Sun

Cao

et al. 2018

Energies

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Coal and gas outburst is one of the major serious natural disasters during underground coal, and the shock air flow produced by outburst has a huge threat on the mine safety. In order to study the two-phase flow of a mixture of pulverized coal and gas of a mixture of pulverized coal and gas migration properties and its shock effect during the process of coal and gas outburst, the coal samples of the outburst coal seam in Yuyang Coal Mine, Chongqing, China were selected as the experimental subjects. By using the self-developed coal and gas outburst simulation test device, we simulated the law of two-phase flow of a mixture of pulverized coal and gas in the roadway network where outburst happened. The results showed that the air in the roadway around the outburst port is disturbed by the shock wave, where the pressure and temperature are abruptly changed. For the initial gas pressure of 0.35 MPa, the air pressure in different locations of the roadway fluctuated and eventually remain stable, and the overpressure of the outburst shock wave was about 20~35 kPa. The overpressure in the main roadway and the distance from the outburst port showed a decreasing trend. The highest value of temperature in the roadway increased by 0.25 • C and the highest value of gas concentration reached 38.12% during the experiment. With the action of shock air flow, the pulverized coal transportation in the roadway could be roughly divided into three stages, which are the accelerated movement stage, decelerated movement stage and the particle settling stage respectively. Total of 180.7 kg pulverized coal of outburst in this experiment were erupted, and most of them were accumulated in the main roadway. Through the analysis of the law of outburst shock wave propagation, a shock wave propagation model considering gas desorption efficiency was established. The relationships of shock wave overpressure and outburst intensity, gas desorption rate, initial gas pressure, cross section and distance of the roadway were obtained, which can provide a reference for the protection of coal and gas outburst and control of catastrophic ventilation.Keywords: coal and gas outburst; laboratory simulation experiment; two-phase flow of a mixture of pulverized coal and gas; shock wave; propagation model

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“…This kind of disaster exists in almost all the main coal-producing 26 them, about one-third occurred in China. Thus, it is one of the major security issues in China coal 28 mining (Guan et al, 2009;Skoczylas, 2012;Xu et al, 2006). With the mining depth and intensity 29 continuously increasing and geological conditions gradually complicating, coal and gas outburst 30 disasters will become more and more serious.…”

Section: Introduction 24mentioning

confidence: 99%

A Continuous Dynamic Prediction Model of Gas Pressure Based on Gas Emission at Excavation Face and its Engineering Application

Chen

Wang

2016

Preprint

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Gas pressure is one of the necessary conditions for the occurrence of coal and gas 11 outburst. Realization of continuous and dynamic gas pressure forecasting is of significance for 12 prevention and control of coal and gas outburst. In this work, we established a gas pressure 13 prediction model based on the source of gas emission with considering fluid-solid coupling 14 process. The verified results showed that the predicted gas pressure was roughly consistent with 15 the actual situation, indicating that the prediction model is correct. And it could meet the need of 16 engineering projects. Coal and gas outburst dynamic phenomenon is successfully predicted in 17 engineering application with the model. Overall, prediction coal and gas outburst with the gas 18 pressure model can achieve the continuous and dynamic effect. It can overcome both the static and 19 sampling shortcomings of traditional methods, and solve the difficulty of coal and gas outburst 20 prediction at the excavation face. With its broad applicability and potential prospect, we believe 21 the model is of great importance for improving prevention and control of gas disasters. 22

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Laboratory study of the phenomenon of methane and coal outburst

Cited by 103 publications

References 8 publications

Balancing the amount and composition of gas contained in the pore space of cupriferous rocks

Balancing the amount and composition of gas contained in the pore space of cupriferous rocks

Experimental Research on the Impactive Dynamic Effect of Gas-Pulverized Coal of Coal and Gas Outburst

A Continuous Dynamic Prediction Model of Gas Pressure Based on Gas Emission at Excavation Face and its Engineering Application

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