Study On Xuandong Second Mine Stope Ground Pressure Features And Working Face Gas Emission Law

In this paper, field measurement, theoretical analysis, numerical simulation and experimentsof similar model are combined to research Xuandong Second Mine’s of stope stress distributiondiscipline and its gas migration characteristics. Following the key findings:(1) Reveal a gas-richmechanisms that magma intrusion to the formation of a thick diabase which lead XuandongSecond Mine III3coal seam and its roof sandstone’s gas reserve increased;(2) Analysis theworking face gas emission law that result from the formation of III3coal mining caving zonewhich leads roof sandstone gas influx; predict the gas emission in different daily output level, andprovide ventilation required maximum and average to maintain underground gas under the safetyline.(3) The technology construction ground horizontal wells pumping coal seams and its roof gasis proposed. Analysis shows that the the horizontal wells highest gas production can reach8000m3/d, the well drained for5years the gas production is accumulative to12.36million cubicmeters, and working face gas pressure is controlled to under0.4MPa, and working face saftymining is achieved. To provide theoretical basis for Xuandong Second Mine’s gas comprehensivecontrol. The research conclusion has certain significance to gas extraction design in similarconditions.