Basic knowledge of coal and gas outburst omen.
Date:2013-11-26 Hits:
Coal and gas outburst: common role in stress and gas dynamic phenomenon, abnormal broken coal, rock and gas from the coal or rock suddenly thrown to the mining space.
1, a coal seam structure, structural disorder: such as bedding, coal heterogeneous or become soft, dark without light coal; coal seam by extrusion fold, thickness, angle steepening, roof convex step, fault, wavy bulges, bed drying.
2, ground pressure hand sign: Buddha sound, sound pressure, coal, coal seam support the dehiscence, coal wall outside of the drum, spalling, residue, coal seam to peel, floor heave, drill down hole, drill pipe, drill a sound clip, rig load etc..
A 3, gas and other aspects: such as gas abnormal effusing, flickering, stuffy, coal dust, coal or increase abnormal odor, air cooled, sometimes hot, drilling and spraying gas, nozzle, ring coal gun, buzzing etc..
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