河南省庇山矿二_1-11091采面带压开采论证及防治水措施

Argumentation of Ⅱ_1-11091 Coal Face Mining under Safe Water Pressure of Aquifer and Water Control Measures in Pishan Coalmine,Henan Province

二1-11091采面位于二煤首采区东翼,采面承受的最大水压为0.65MPa,属带压开采工作面。在分析采面充水因素的基础上,发现对采面回采有影响的充水水源为石炭系太原组L7灰岩岩溶裂隙水和寒武系灰岩岩溶裂隙水。经计算,采面回采后的冒落带高度为39.36m,采动破坏带高度为16.35m,而L7灰岩上距二1煤距离仅为10m,存在突水的可能。采面开采安全评价认为,尽管L7灰岩水基本处于采动破坏带内,也有水压,但该含水层在矿区内无充沛的补给水源,因而不会发生大规模的突水事故;寒武系灰岩岩溶裂隙水在各钻场附近的底板突水系数均小于0.06MPa/m,突水危险性相对较小,按照临界突水系数反算底板隔水层承受水压值,均大于现在采面机巷最大水压0.65MPa,所以在回采过程中也不会发生大规模的突水事故。最后对回采期间的排水工程,F59断层的探测工程和下部掘进面的疏放水工程等防治水工程和防治水效果进行了说明。

The II1-11091 coal face is situated at east limb of the first winning district,borne maximum water pressure is 0.65MPa,a working face of mining under safe water pressure of aquifer.According to coal face water filling factor analysis,has found that the impacting water filling sources are from Carboniferous Taiyuan Formation L7 limestone karstic fissure water and Cambrian limestone karstic fissure water.Based on estimation,the caving zone height is 39.36m after extraction,mining-induced fracture zone height 16.35m,while interval between II1 coal roof and L7 limestone only 10m,thus water bursting is possible.The coal face winning safety assessment considered that,although L7 limestone is basically situated within the mining-induced fracture zone,also with water pressure,but since no abundant feeder in the mine area,as such large water bursting accident will not happen.The floor water bursting coefficients of Cambrian limestone karstic fissure water near each drilling site are all less than 0.06MPa/m,thus water bursting hazard relatively minor.According to critical water bursting coefficient inverse computed water pressure values the floor aquifuge can bear all larger than present coal face conveyor roadway maximum water pressure 0.65MPa,thus no large water bursting accident will be happen during extraction.Finally the paper has expounded to the water control engineering of drainage during coal winning,F59 fault detecting,water drainage and discharge of lower heading faces,as well as water control effects.