Theory and Technology System of Green Coal Mining for Mine Areas with High Confined Pressure Groundwater

Hanxing mine areas are famous with high confined pressure groundwater in Ordovician limestone in China. With the increase of mining depth and intensity, especially into the subjacent coal mining, mining environment becomes increasingly complex, water pressure, ground stresses and ground temperature grow continually, threats from groundwater in Ordovician limestone with high confined -pressure and powerful water- rich become obvious, the problem of geothermy, mill dust, noise and so on which affect directly miner's physical and mental health miners increases continually, environmental pressure caused by waste rock hill, ground subsidence, mine waste water becomes bigger. Aim at these problems, the concept of green mining is illustrated from four aspects, coal mine safety, occupational health, geothermy utilization and environment protection, a whole set of theory and technology system of green coal mining for mine areas with high confined pressure groundwater is presented, risk assessment and control of water-inrush from bottom, formation mechanism and control of mine heat disaster, integrated comprehensive control of noise-reduction and dust-abatement, waste rock filling, ground subsidence and pollution control, mine water resource and recharge nourishment source, which are: (1) the module of Karst sinkhole prediction and exploration are presented, which lay a foundation for the Ordovician limestone flood control; (2) geothermy abnomality in the area mainly controlled by geological structure, magma activity is heat resource for geothermy disaster, groundwater is geothermy carrier; (3) equipments with multifunction in one were researched and developed, such as waste rock filling conveyer and tunnel filling grout-inject equipment, waste rocks still in well, without waste rock hill on ground, waste rocks substitute coal resource are actualized; (4) based on integrated technology of Inertia gravity coupled with dust-abatement noise-reduction, combination with gravity dust-abatement mechanism, Inertia dust-abatement mechanism, sound-absorption and noise-isolation mechanism, special diversion pagoda were used to control dust and noise at mine air pit exhaust ostium; (5) after treatment of mine drainage water, a part of them used to production and life, the other used to recharge Ordovician limestone aquifer, not only sewage drainage being solved but also basic balance of groundwater being hold.