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中文摘要：
分析了高压水射流水力割缝防突机理,并在新安煤矿14221工作面现场进行了水力割缝防突技术试验,结果表明,在水力割缝过程中有大量煤与瓦斯随水流从钻孔内排出,各割缝孔平均冲出煤62 kg,巷道瓦斯浓度最大为0.8%,比未割缝前的瓦斯浓度增加了2-3倍;钻孔瓦斯涌出初速度v最大值由割缝前的20 L/min降到割缝后的4 L/min,v值下降80%左右。水力割缝技术能使煤体卸压带加长,煤体瓦斯潜能及弹性能得到有效释放,应力集中区向内部转移,减弱或消除了煤体的突出危险性。
英文摘要：
In order to obtain a clear idea about the effectiveness of water jet kerf-cutting as an outburst prevention technology,a theoretical analysis is carried out in this paper on the mechanism of coal/gas outbursts and the mechanism of water jet kerf-cutting to prevent such outbursts.In reality,a field experiment is carried out on the site of #14221 heading face in Xin＇an Coal Mine to test this outburst prevention technology.The experiment results indicate that large quantities of coal and methane flow out of the drill holes together with water flows from the cracks or kerf made.An average amount of 62kg of coal-gas is blown out of each kerf or drill holes while on the other hand methane gas concentration in the drift reaches the high of 0.8%,2 ～ 3 folds higher than it was before the cutting/drilling is made.The maximum value of the initial methane gas outflow rate from the drill holes v increases from v = 20 L/min before the cutting/drilling drops down to 4 L/min by around 80%.The application of this technology extends the pressure relieving zones in the coal body,which helps realize an effective release of the potential power and elastic energy of the coal seam methane gas,while at the same time the stress concentrated area shifts towards the central part,which minimizes or eliminates the dangers of coal outbursts.
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