Collaborative Gas Drainage Technology of High and Low Level Roadways in Highly-Gassy Coal Seam Mining

Xu, Chao; Wang, Kai; Li, Xiaomin; Yuan, Liang; Chun-yu, Zhao; Guo, Haijun

doi:10.2139/ssrn.4004950

Cited by 1 publication

(2 citation statements)

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“…In addition, there is a little difference in the types of hysteresis loops between intact coal and deformed coal under the same particle size condition, which shows that the shapes of minipores and micropores are not sensitive to the tectonism. It is 6 Geofluids worth noting that when the relative pressure of adsorption isotherm is greater than 0.5, the hysteresis loop width is larger, and open pores are more. According to Figure 4, when the relative pressure > 0:5 and the particle size decreases, the hysteresis loop widths of intact coal and deformed coal increase, and the hysteresis loop width of deformed coal is larger than those of intact coal under the same particle size.…”

Section: Low-temperature Liquid N 2 Adsorption/desorptionmentioning

confidence: 99%

“…China is one of the most important coal production and consumption countries in the world [1][2][3]. The large increase in coal demand leads to the depletion of shallow coal resources and continues to extend to deep coal resources [4][5][6]. That leads coal and gas outburst disasters to become more and more serious, which greatly affects the safety of mine production [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Fragmentation on Pore Structures and Fractal Characteristics of Intact Coal and Deformed Coal Based on Experiments

Wang

et al. 2022

Geofluids

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Coal mining has to develop to deeper strata with the increasing demand for coal, which leads to frequent coal and gas outburst disasters. Especially, when there is a deformed coal in the coal seam, the outburst disasters are easier and more intense. Coal and gas outburst disasters can be promoted by the fragmentation. In order to clearly explain the reasons for the impact of fragmentation on deformed coal and gas outburst, mercury intrusion porosimetry, low-temperature liquid N2 adsorption test, and scanning electron microscope were carried out in this paper. The differences in pore characteristics of intact coal and deformed coal under different particle size conditions were analyzed from pore shapes, pore size distributions, and fractal dimensions. The damage paths of fragmentation on various kinds of pores in intact coal are as follows: macropores, mesopores, minipores, and micropores, and those on various kinds of pores in deformed coal are as follows: macropores, micropores, mesopores, and minipores. According to the fractal dimension theory and experimental results, the calculative results of fractal dimensions show that the fragmentation and tectonism reduce the surface roughness and structural complexity of macropores and mesopores and increase those of minipores and micropores in deformed coal. Finally, combined with the coupling effect of fragmentation and tectonism on pores, the reason of deformed coal with high crushing degree in fields of outburst was explained. The research provides the basis for the prevention of coal and gas outburst.

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Section: Low-temperature Liquid N 2 Adsorption/desorptionmentioning

confidence: 99%