Key Laboratory of Western Mine Exploitation and Hazard Prevention with Ministry of Education

Fengcheng, China

Key Laboratory of Western Mine Exploitation and Hazard Prevention with Ministry of Education

Fengcheng, China
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Li S.-G.,Xi'an University of Science and Technology | Li S.-G.,Key Laboratory of Western Mine Exploitation and Hazard Prevention with Ministry of Education | Shuang H.-Q.,Xi'an University of Science and Technology | Shuang H.-Q.,Key Laboratory of Western Mine Exploitation and Hazard Prevention with Ministry of Education | And 5 more authors.
Sustainability (Switzerland) | Year: 2017

A drainage roadway was constructed in the fractured zone beside an air-return roadway of a mining site. However, drainage roadways serve only one working face and are discarded after mining, thus weakening sustainable mining practices. To improve the sustainability at mining sites, this paper proposes a new drainage roadway that can serve two adjacent working faces. A schematic layout of the proposed lateral high drainage roadway (LHDR) is presented. The LHDR can be used to extract pressurized gas from two neighboring mining zones. A theoretical study, numerical simulation, and field observations were performed to identify the mining-induced fractures and stress distribution. The layout of the LHDR and the optimal position of the extraction boreholes were derived considering the geological conditions in the Liyazhuang Coal Mine in China. A borehole and LHDR were installed at the specified mining site and the rock displacement of the LHDR and gas concentration at branch pipelines, boreholes of the LHDR, and upper part of the working face were monitored during mining. The performance of the LHDR was validated. © 2017 by the author.


Luo Z.,Xi'an University of Science and Technology | Luo Z.,Key Laboratory of Western Mine Exploitation and Hazard Prevention with Ministry of Education | Wang T.,Xi'an University of Science and Technology | Wang T.,Key Laboratory of Western Mine Exploitation and Hazard Prevention with Ministry of Education | And 7 more authors.
Journal of Loss Prevention in the Process Industries | Year: 2014

Gas explosion is the leading accident in underground coal mining in China. Using the self-improved 20L spherical experimental system, the impacts of 8% CO2, ABC powder at various concentrations and mixture of them on the suppression of mine gas explosion were investigated. The results indicate that cooperative synergism exists between ABC powder and CO2. Their combination has a better effect than each of the two components acting alone, especially for the gas of larger concentration. When 0.25g/L ABC powder was mixed with 8% CO2, the explosion limits were reduced by about 55%, the time to reach the peak explosion pressure was prolonged 3.56 times on average. Meanwhile, the maximum explosion pressure declined on an average of 59.4% and the maximum explosion overpressure rising rate decreased on an average of 91.1%. A combination of 0.20g/L ABC powder and 8% CO2 completely suppressed 11% gas explosion. The explosion suppression mechanism of CO2 and ABC powder were probed theoretically. CO2 plays a key part in the whole explosion processes, and it can effectively suppress the forward reaction between gas and oxygen. While it is during the middle-later period of explosion processes that ABC powder plays a critical role. The particles decomposed from heated ABC powder such as nitrogen and phosphor will react with free radicals rapidly. Besides, atoms as N, P are capable of participating in chain reaction and reacting with active groups, significantly suppressing the gas explosion. © 2014 Elsevier Ltd.

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