Abstract
Mining is gradually progressed toward the in-depth area of No.8 solid coal seam in No.3 panel of Baode Coal Mine. In order to secure safe mining in this area, a systematic analysis is conducted on the geological factors that influence gas occurrence. Based on the basic data actually measured at site, grey relational analysis (GRA) is adopted for predictive analysis of influencing factors (depth, coal seam thickness, metamorphic grade, sand to mud ratio of roof, sand to mud ratio of floor, geological structure and washout), followed by establishment of a grey relational model. Then, the relation degree among factors is calculated, thus identifying the main controlling factors of gas occurrence. The research result suggests: the main geological factors that influence gas occurrence in No.8 coal seam are geological structure and washout. A model equation is established for prediction of gas content using multiple regression method: y=3.2429+0.0047X1+0.0079X2-0.0180X3+0.0016X4-0.0215X5+0.4641X6+0.2001X7. This equation demonstrates high degree of fitting.
Highlights
Baode coal mine is a high gassy mine with approved production capacity of 5Mt/a
Since mining in Baode coal mine is progressing toward the in-depth area of No.3 panel, there has been increased gas content and gas discharge
It’s necessary to strengthen the research on gas content in the in-depth area of coal seam, the essence of which is researching the geological factors that influence the gas occurrence in the coal seam
Summary
The main mining area is No. coal seam. Since mining in Baode coal mine is progressing toward the in-depth area of No. panel, there has been increased gas content and gas discharge. It’s necessary to strengthen the research on gas content in the in-depth area of coal seam, the essence of which is researching the geological factors that influence the gas occurrence in the coal seam. The coal seam structure is simple ~ complex, with 3~4 dirt bands in general whose total thickness is between 0~3.84m and 1.38m on average. According to measurement performed near the 7 exposed faults in No. panel, the average gas content is 6.35m3 /t. The average gas content is 5.87 m3 /t in gas coal area and 5.28 m3/t in long coal area. Depth/m Coal thickness/m volatile component% Sand to mud ratio of roof Sand to mud ratio of floor Fault Washout measured content (m3/t) Predicted content (m3/t) Error ratio%
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