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为了提高水力冲孔技术的消突效果,建立了考虑煤的塑性软化、扩容特性和流变特性的钻孔周围煤体黏弹塑性模型,得到了不同冲煤量钻孔的卸压范围,建立了考虑渗透率动态变化和吸附特征的渗流-应力耦合模型,采用COMSOL软件对建立的耦合模型进行求解,研究了不同冲煤量钻孔的抽放半径,优化了水力冲孔布孔参数。结果表明:在确定水力冲孔布孔参数时,应综合分析水力冲孔的卸压范围和抽放半径,冲煤量为0.5,1.0和1.5 t/m时,卸压范围分别为3.71,4.61和5.8 m,抽放半径分别为3.5,4.3和5.0 m,义安矿平均冲煤量为1.0 t/m,由此确定水力冲孔布孔间距为8.0 m,区域措施效果检验和工作面预测数据表明,确定的布孔参数合理可靠。
In order to improve the elimination effect of hydraulic punching technology, the viscoelastic-plastic model of coal surrounding the borehole considering the plastic softening, expansion and rheological properties of coal was established, and the pressure relief range of drilling holes with different coal flushing volume was established. The seepage-stress coupling model considering the dynamic change of permeability and adsorption characteristics was adopted. The COMSOL software was used to solve the coupled model. The drainage radii of drilling holes with different coal flushing volume were studied and the parameters of hydraulic punching holes were optimized. The results show that when determining the parameters of hydraulic punching holes, the pressure relief range and drainage radius of hydraulic punching should be comprehensively analyzed. When the coal flushing amount is 0.5, 1.0 and 1.5 t / m, the pressure relief ranges are 3.71 and 4.61 respectively And 5.8 m respectively. The draining radii were 3.5, 4.3 and 5.0 m respectively. The average amount of coal flushing in the Yian Mine was 1.0 t / m, and the spacing of hydraulic punching holes was 8.0 m. The regional measures and the working face prediction The data show that the parameters of the holes are reasonable and reliable.