Abstract
In order to reveal the evolution law of gas discharge of carbon monoxide in mining an extra-thick coal seam of the Datong mining area by the numerical simulation and field monitoring test, the 8202 working face and 8309 working face in the Tongxin coal mine are chosen as the test sites. The results show that the seepage flow of carbon monoxide gas reaches 1.854 × 10 − 8 m 3 / s in the #1 fracture after the #3 key stratum in the far field breaks in the 8202 working face, the seepage flow of carbon monoxide gas reaches 1.307 × 10 − 7 m 3 / s in the #2 fracture, the seepage flow of carbon monoxide gas reaches 4.276 × 10 − 7 m 3 / s in the #3 fracture, the seepage flow of carbon monoxide gas reaches 4.192 × 10 − 7 m 3 / s in the #4 fracture, and the seepage flow of carbon monoxide gas reaches 1.623 × 10 − 7 m 3 / s in the #5 fracture. The initial caving of the #3 key stratum in the far field occurs and collapses to the gob, when the working face in the #3-5 coal seam advances to 180 m, and the voussoir beam forms in the #3 key stratum. Besides, a shower shape was formed by the seepage flow of carbon monoxide gas, and the maximum flow in the working face reaches 4.562 × 10 − 4 m 3 / s . When the 8309 working face advances from 521.2 m to 556.4 m, the air pressure at the working face gradually rises and reaches the maximum magnitude and then begins to decrease; when the working face advances to 556.4 m, the air pressure at the working face reaches the maximum magnitude of 91.35 kPa. The gas discharge disaster of carbon monoxide in mining the extra-thick coal seam of the Datong mining area is effectively controlled by the dynamic balance multipoint control technology. The research results can be treated as an important theoretical basis for the prevention and treatment for carbon monoxide discharge disaster in mining the extra-thick coal seam of the Datong mining area.
Highlights
Coal resource is the one of the kinds of basic energy for economy and social development, and the sustainable development of the coal industry is closely related to economic and social development and energy security in China [1]
The carbon monoxide gas discharge disaster occurred in the Tongxin coal mine in Shanxi province, which greatly affected the safety mining production [8, 9]
It is of great significance to research the evolution law of gas discharge of carbon monoxide in mining an extra-thick coal seam, in order to guarantee the safe mining in the Datong mining area
Summary
Coal resource is the one of the kinds of basic energy for economy and social development, and the sustainable development of the coal industry is closely related to economic and social development and energy security in China [1]. It is of great significance to research the evolution law of gas discharge of carbon monoxide in mining an extra-thick coal seam, in order to guarantee the safe mining in the Datong mining area. The average mining thickness of the #3-5 coal seam in the Datong mining area is 15 m; the working face is connected with the above abandoned gob, where CO gas is accumulated by the mining-induced fractures in the overburden, leading to the gas discharge disaster of carbon monoxide. Based on the mining and geological conditions of the 8202 working face and the 8309 working face in the Tongxin coal mine in Shanxi province, the evolution law of the gas discharge of carbon monoxide in mining the extra-thick coal seam of the Datong mining area is studied, by the numerical simulation and field monitoring test. The research results can be treated as an important basis for the prevention and treatment of carbon monoxide discharge disaster in mining extra-thick coal seams
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