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Xiaowei Li

Bio: Xiaowei Li is an academic researcher from China University of Mining and Technology. The author has contributed to research in topics: Coal & Coal mining. The author has an hindex of 12, co-authored 41 publications receiving 493 citations.
Topics: Coal, Coal mining, Drilling, Drill, Borehole

Papers
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Journal ArticleDOI
TL;DR: Xu et al. as discussed by the authors used the initial expansion energy of released gas (IEERG) as an indicator to identify outburst-prone coal seams, which can be conducted before or after the occurrence of dynamic phenomenon.
Abstract: Coal and gas outburst with a sudden and violent ejection of a large amount of coal and gas from the working face is the most harmful dynamic phenomenon during coal mining (Aguado and Nicieza 2007; Lama and Bodziony 1998; Torano et al. 2012). Outbursts have occurred in all the major coal-producing countries around the world; however, nearly one-third of the total outbursts have occurred in China (Guan et al. 2009; Skoczylas 2012; Xu et al. 2006). The process of judging the possible occurrence of coal and gas outburst in the near future is defined as the identification of outburst-prone coal seams, which is of great significance for underground mining safety. The identification of outburst-prone coal seams can be conducted before or after the occurrence of dynamic phenomenon. Since the vast majority of coal seams do not show dynamic phenomenon, it is necessary to identify outburst-prone coal seams before the occurrence of dynamic phenomenon. To this end, many dynamic characteristic indicators have been used. For example, gas content thresholds of 9 m/t for CH4 and 6 m /t for CO2 were used in the Sydney Basin to indicate outburst-prone conditions, but they were based on empirical experience from operations and may vary from one coal seam to another. The DP indicator, based on the initial rate of gas desorption from coal, has been widely adopted in Europe. However, in Australia, outbursts occurred in coal seams showing low DP values (Beamish and Crosdale 1998). Currently in China, the ‘‘Four Indicators [degree of coal fracturing (for more details, see Table 1), Protodyakonov strength index (f), initial rate of gas emission (DP), and gas pressure (P)] Method’’ given in the Chinese standard AQ 1024-2006 (State Administration of Work Safety, SAWS 2006) is used as the standard for the identification of outburst-prone coal seams. If all the measured values of the four indicators exceed their thresholds given in Table 2, the coal seam is identified as an outburst-prone coal seam. This method has been widely used in China for its simplicity. However, the predictions with the ‘‘Four Indicators Method’’ are not always consistent with the occurrence of dynamic phenomenon during underground mining, and outbursts causing large casualties still occur in some nonoutburst seams identified using this method. Thus, the accurate identification of outburst-prone coal seams is an urgent issue. In this paper, a novel identification model under the ideal condition of uncovering coal in crosscut (IUCC) is proposed, in which the initial expansion energy of released gas (IEERG) is used as an indicator to identify outburstprone coal seams. To obtain the threshold of the IEERG indicator, numerous experiments of coal and gas outburst were carried out and the IEERG of coal samples were measured. After that, the ‘‘IEERG Indicator Method’’ was used on the spot to verify its accuracy. C. Jiang (&) L. Xu X. Li J. Tang Y. Chen S. Tian H. Liu School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China e-mail: xlh0612@163.com

79 citations

Journal ArticleDOI
15 Aug 2018-Fuel
TL;DR: In this paper, a finite number of outburst simulation tests were carried out in the study and the results showed that the contribution of the gas pressure to the energy required for an outburst is hundreds of times that of the in situ stress during the outburst.

79 citations

Journal ArticleDOI
TL;DR: In this article, the authors investigated the effect of gas on coal and gas outbursts in the presence of N 2 and CO 2, and showed a strong correlation between the gas release capacity during the first 10 minutes and natural desorption gas content of the onset of coal exposure.

67 citations

Journal ArticleDOI
TL;DR: In this paper, a theoretical formula for calculating the amount of gas released from boreholes during drilling was deduced, and the gas emission per unit borehole length was related to the ground stress, gas pressure, and coal strength around the borehole during drilling.

66 citations

Journal ArticleDOI
15 Nov 2018-Fuel
TL;DR: In this article, a set of self-designed gas desorption equipment was used to carry out gas adsorption-desorption experiments in the first dozen seconds (about 13) on coal with different moisture contents.

57 citations


Cited by
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Journal ArticleDOI
TL;DR: In this paper, the authors provide a comprehensive review of the coal-gas compound dynamic disasters in the past 30 years and discuss the mechanism, classifications, typical case analysis, prediction and prevention of coal gas compound dynamic disaster, and urgent problems and directions in future research.

126 citations

Journal ArticleDOI
15 Feb 2019-Energy
TL;DR: In this paper, a self-made programmed experimental system was used to maintain temperature parameters at specified levels to simulate the combustion properties of coal, and the results indicated that the apparent activation energies decreased through the first three stages and then increased in the fourth stage.

121 citations

Journal ArticleDOI
TL;DR: In this paper, a new apparatus was developed to conduct simulated experiments with different gases of CO2 and N2, and the authors analyzed the formation and transport mechanism of coal-gas flow in roadway as well as evaluate the effects of gas desorption on its development.

119 citations

Journal ArticleDOI
TL;DR: In this article, the pore structure and fractal characteristics of pulverized intact coal and tectonic coal, proximate analysis, gas adsorption/desorption, and N2 (77K) adaption experiments were performed.

118 citations

Journal ArticleDOI
TL;DR: In this paper, the influence of hydraulic slotting inclination on the mechanical behaviors of coal seam during mining process, uniaxial compression experiments on coal specimens with a single pre-existing flaw inclined at 0°, 15°, 30°, 45°, 60°, 75°, 90° and intact specimens were conducted.

118 citations