Abstract
Gas (coalbed methane) and fissure water often coexist in coal-bearing strata, and gas is sealed in adjacent rock strata by fissure water in some coal mines. After the fissure water is discharged, abnormal gas emission may occur due to accidental release of large amount of sealed gas. In the present work, abnormal gas emission caused by accidental discharge of floor fissure water occurred at Tangjiahe Coal Mine (Guangyuan, China), and its control method was discussed. Sealing technology, uniform pressure ventilation and gas drainage for intercepting gas by cross-boreholes were adopted to solve abnormal gas emission. Firstly, several sealings were constructed to seal gobs full of high-concentration gas, which prevented gas diffusion and spread into mining space. Two gas extraction systems were installed, and uniform pressure ventilation was applied to eliminate fissure gas accumulated in gobs. Subsequently, a comprehensive recovery of ventilation was realized. As a supplementary measure, downward cross-boreholes were drilled to prevent gas from releasing into mining space.
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