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Cheng L.H.,Xian University of Science and Technology | Cheng L.H.,Key Laboratory of Western Mine Exploitation and Hazard Prevention of the Ministry of Education | Li S.G.,Xian University of Science and Technology | Li S.G.,Key Laboratory of Western Mine Exploitation and Hazard Prevention of the Ministry of Education | And 3 more authors.
Rock Mechanics: Achievements and Ambitions - Proceedings of the 2nd ISRM International Young Scholars' Symposium on Rock Mechanics | Year: 2012

In order to study the effect of temperature and particle size on the adsorption content of coal, the tests have been completed under different temperature and particle size conditions for the same coal sample using the WY-98B adsorption constant determining device. The tests show that in the same condition of particle size and pressure, the adsorption content and the Langmuir adsorption constant a decrease as the temperature increases. In the constant temperature condition, the adsorption content of the coal is increases as the particle size decreases or the pressure increases, but the adsorption content tends to stable as the pressure reaches to some value. © 2012 Taylor & Francis Group. Source


Wang H.,Xian University of Science and Technology | Wang H.,Key Laboratory of Western Mine Exploitation and Hazard Prevention of the Ministry of Education | Li S.,Xian University of Science and Technology | Li S.,Key Laboratory of Western Mine Exploitation and Hazard Prevention of the Ministry of Education | And 5 more authors.
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | Year: 2016

To solve the problems of the gas consistence exceeding limit at the upper corner of the two adjacent coalfaces and to realize the high drainage roadway with two utilizations, the arrangement mode and the connotation of the lateral high drainage roadway (LHDR) were proposed. Along the air return way of the upper coalface, strike high-bleeding roadway in roof was laid on lateral upper coalface, pressure relief gas in fractured zone of the upper coalface's overlying strata was extracted by boreholes in high drainage roadway at the earlier stage of service, pressure relief gas in fractured zone of the next coalface's overlying strata was extracted by the roadway at the later stage of service, the LHDR could serve two coalfaces, and the utilization ratio of the LHDR was improved. Based on the geological conditions of No.2-603 coalface of Liyazhuang coal mine in Huozhou, Shanxi Province, mechanical model of the LHDR was established. The overlying strata's mining-induced fracture development features were analyzed by the methods of the theoretical analysis, numerical simulation, similar material simulation and field measurement, the overlying strata's mining-induced fracture distribution law was obtained, and the layout parameters of the LHDR and drainage boreholes were determined. Based on the borehole inclination survey results, borehole angle compensation correction method and the evaluation index of borehole correction effect were proposed. The high drainage roadway was located at 25.0 m to the roof of No.2 coal seam, and 25.0 m to the No.2-603 coalface. The borehole's final hole location was 44.0 m in height over the roof, and the correction angles of the horizontal direction and inclined direction were -3° and -2° respectively. The results show that, mining of the No.2-603 coalface has little influence on the lateral high drainage gateway, the roadway section can meet the drainage requirements of No.2-605 coalface, the borehole's final hole location is reasonable, and the maximum and average value of the gas concentration is improved by 15.3% and 11.6%, and the gas consistence at the upper corner is 0.504%-0.953% and 0.467%-0.893%.The problem of the gas consistence exceeding limit is solved, and the coalface is mined safely and effectively. © 2016, Central South University of Technology. All right reserved. Source

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