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This paper construct a profile model with length and height of 40 m and 9 m respectively based on the two most difficult problems which are mine pressure and gas control to simulate the migration law of gas within the period weighting step of 15m, 20m, 25m in the three areas (0-6m, 6-12m, and after the region of 12m). The results show that the gas migrates to the workplace closing the not caving roof...
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