摘要:
为增强煤体黏结力和塑性并抑制瓦斯放散强度,以达到稳定煤体区域防突的目的。以重庆天府三矿K4煤层为目标区,进行了低温液氮孔隙结构分析实验、煤体润湿性实验和湿润边角测定实验,分析了煤层注水可行性。实验表明:煤体孔隙多数为平板状开放孔,润湿边角<90°,吸水性强,具注水可行性。在重庆天府矿业公司850 m深井底板岩巷进行了煤体扩孔卸压后的高压注水试验,测定了卸压后煤体透水性系数。建立了煤层注水的径向渗流力学方程,以实测数据为基础,优化计算了合理的注水压力、时间、注水半径等动态时空参数。
Abstract:
To strengthen the coal bonding force and plasticity,inhibit the gas irradiation intensity and achieve the purposes of stabilizing the coal body and regional outburst prevention,taking K 4 coal seam of Tianfu No.3 coal mine in Chongqing as target area,cryogenic liquid nitrogen pore structure analysis experiments,coal wettability experiments and moist corners measurement experiment were carried out,and the feasibility of coal seam infusion was analyzed.The experiments showed that the majority of coal pores were plate-shaped open holes with strong water absorption,wetting corners were less than 90°and had the feasibility of water infusion.The high-pressure infusion test was carried out in the floor rock of deep shaft of Chongqing Tianfu mining company with depth of 850 m after the relief of the coal body reaming,and coal permeability coefficient was measured after relief.Based on measured data,the radial flow mechanics equation of coal seam infusion was established,and the dynamic spatial and temporal parameters of water infusion pressure,time,and infusion radius were optimized and calculated.
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