水力冲孔卸煤量对增透效果的影响
Influence of Hydraulic Punching Coal Unloading Amount on Permeability Improvement
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摘要: 以桂箐煤矿M9煤层为研究依托，在考虑克林伯格效应条件下，建立煤体瓦斯流固耦合模型，模拟冲出煤量对增透效果的影响，得出抽采有效影响半径随冲出煤量的增加逐渐增大，但等量单孔扩煤量增加到一定程度时，抽采有效影响半径增加的幅度减小。通过分析确定M9煤层冲出煤量1 t/m为宜，合理抽采时间3个月，合理布孔间距为5 m×5 m，并进行工程实践，消突效果良好。Abstract: Based on the M9 coal seam of Guiqing Coal Mine, a gas flow solid coupling model was established under the condition of Klinken-berg effect. We simulate the influence of punching coal amount on permeability improvement, and draw a conclusion that effective influence radius of extraction is gradually increased with the increase of punching coal amount. However, when the expanding coal quantity of equivalent single hole increases to a certain degree, the range of effective extraction influence radius is decreased. It is appropriate to determine that the punching coal amount of M9 coal seam should be 1 t/m through analysis, the reasonable extraction time is 3 months, and the reasonable spacing of holes is 5 m×5 m. In engineering practice, the outburst elimination effect is good.
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