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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。
II 1-11091 Caving area is located in the eastern section of the first coal mining two coal mining face to withstand the maximum pressure of 0.65MPa, a pressure mining face. Based on the analysis of water-filling factors of mining face, it is found that the water-filling sources that affect the mining face are L7 limestone karst fissure water and Cambrian limestone karst fissure water in Taiyuan Formation of Carboniferous. After calculation, the height of the caving zone after mining face mining is 39.36m, the height of mining failure zone is 16.35m, and the distance of L7 limestone from that of No. 1 coal is only 10m. There is the possibility of water inrush. According to the safety assessment of mining face, the L7 limestone water is basically within the mining failure zone and has water pressure, but the aquifer does not have enough water supply in the mining area so that no large-scale water inrush accident will occur. The Cambrian In the limestone karst fissure water, the floor water inrush coefficients near the drilling sites are both less than 0.06MPa / m, and the risk of water inrush is relatively small. The water pressure received by the floor aquifuge is greater than that of the present mining according to the critical water inrush coefficient The maximum water pressure in the noodle machine lane is 0.65MPa, so large-scale water inrush accidents will not occur during the mining process. Finally, the drainage works during the mining period, the exploration project of the F59 fault and the water diversion project under the excavation face are described.