水力切槽高瓦斯煤体失稳发生机制与试验分析

doi:10.13722/j.cnki.jrme.2019.0177

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摘要为了探讨水射流增渗诱发孔内煤与瓦斯失稳喷出机制，以高瓦斯煤层内水力切槽工艺为研究对象，采用失稳条件理论分析与井下现场单因素试验的方法，结合煤岩电磁辐射与钻孔瓦斯涌出量的综合监测，论证水力切槽煤体失稳的地应力、瓦斯压力综合作用及其影响特征。结果表明：水力切槽扩展会增强煤体的地应力与瓦斯梯度力作用，孔内煤体失稳发生需达到切槽最小临界出流水压在冲击时间上的积累，切槽出流水压与钻孔排出煤屑质量呈线性正相关，与钻孔初次发生失稳喷出时间呈线性负相关，而钻孔周围瓦斯压力降低会弱化切槽煤体失稳喷出效应；失稳喷出过程中煤岩电磁辐射(EMR)信号剧烈波动且切槽失稳完成后EMR能量水平降低的现象，反映了切槽失稳的地应力响应；瓦斯预排放钻孔切槽完成后瞬时瓦斯涌出量明显降低的现象，反映了切槽失稳的瓦斯压力响应，现场试验结果与理论分析结果相互验证。研究结论为水射流增渗技术工程实践中的喷孔防治提供依据支撑。

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	沈春明1
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	林柏泉3
	王维华2
	张慧杰2
	韩雷4

关键词 ：采矿工程, 水力切槽, 失稳喷孔, 电磁辐射, 瓦斯涌出

Abstract：In order to research the mechanism of coal and gas outburst from boreholes induced by the water jet technique for enhancing coal permeability，theoretical analysis of coal mass instability conditions and single factor test in underground field were carried out，and coal rock electromagnetic radiations(EMR) and gas emissions from boreholes were monitored based on the hydraulic slotting technique in high-gas coal seams. The action mechanisms of in-situ stresses and gas pressure on coal mass instability with hydraulic slotting and their influence characteristics were demonstrated. The results show that slotting expansion can enhance the effect of in-situ stresses and gas gradient force around the borehole and that the minimum critical pressure value of the water jet with enough impacting time is needed for the coal body to outburst in the borehole. It is also shown that the flow pressure of water jet has a linear positive correlation with the weight of coal debris discharged from boreholes while a linear negative correlation with the time of initial outburst occurring. Decreasing of the gas pressure around the borehole would weak the effect of coal mass instability ejection. The phenomena that the coal and rock EMR signal fluctuates sharply during the unstable ejection and the EMR energy level decreases after slotting reflect the instability influenced by the in-situ stress，and the phenomenon that the instantaneous gas emission from the gas pre-discharge borehole decreases obviously after slotting reflects the instability influenced by the gas pressure. The research conclusions provide a reference for the prevention and control of borehole ejection in the application of hydraulic slotting technology.

Key words： mining engineering hydraulic slotting instable spraying borehole electromagnetic radiation gas emission

引用本文:

沈春明1，2，3，林柏泉3，王维华2，张慧杰2，韩雷4. 水力切槽高瓦斯煤体失稳发生机制与试验分析[J]. 岩石力学与工程学报, 2019, 38(10): 1979-1988.
SHEN Chunming1，2，3，LIN Baiquan3，WANG Weihua2，ZHANG Huijie2，HAN Lei4. Field test analysis of instability mechanisms of high gas coal seams induced by hydraulic slotting. , 2019, 38(10): 1979-1988.

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http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2019.0177 或 http://www.rockmech.org/CN/Y2019/V38/I10/1979

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