Research On Fully Mechanized Caving Mining Theory And Observation-control Technology Of Thick Coal Seam Under Daping Coal Mine Reservoir

Daping Coal Mine is located in LiaoNing province Kangping County,49.4percents of its total reserves is under Santaizi reservoir. Thick coal seam between8-16meters is very suitable for fully mechanized mining. According to the national regulations in "Coal mine safety regulations","Prevention and control of coal mine water regulations" and "Setting up of coal pillar and coal mining under pressure regulations in building, water, railway and main laneway", the height of caving zone and cater flowing fractured zone must be found out before mining under case-I water in Santaizi reservoir, as a scientific basis of mining under water in this area. Water prevention coal (rock) pillar also should be setting up enough. So the height of overburden destruction water flowing fractured zone in fully mechanized mining, surface movement law of damage and reasonable setting up of protective layer thickness are the important parameters in safety mining under reservoir, and online automatic safety monitoring of mine water condition is the important safeguard in safety mining under reservoir.Aimed at the thick coal seam condition of Daping Coal Mine, the mining overburden stratum damage condition on the spot is detected, at four single working face and one Joint working face, using the hole washing liquid leakage vector method, EH-4,seismic vertical and horizontal wave and other geophysical prospecting methods. Accompanied with Similar material model test and numerical simulation theoretical analysis method, the full-mechanized caving mining failure mode, feature, the forming and developing process of caving zone, water flowing fractured zone, abscission zone of thick coal seam are wholly studied. Based on the observed data, formulas on the height of overburden destruction water flowing fractured zone in fully mechanized mining and the mining and caving height of Daping Mine was established. Based on the features of thick coal seam overburden destruction of Daping Mine, the protective layer selection method and the unexploiting method of water prevention coal (rock) pillar are defined. A scientific basis for following under reservoir safety mining by observing surface deformation and earth surface fissures growth altitude is provided by using earth surface deformation observation station.Using the three years observed data provided by on-line automatic safety monitoring of mine water condition, the change law of the ground water, underground aquifer water, water pouring amount in the pit is analyzed, and technical support for early warning in under reservoir safety mining of Daping Mine is provided.