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为有效治理水力割缝钻孔喷孔现象,系统分析了喷孔发动机理,提出“强水快割”和“细水慢割”2种水力割缝方式,通过FLAC3D数值模拟和现场工程实践,着重研究了不同割缝方式对喷孔的影响。结果表明:“强水快割式”水力割缝快速、剧烈地破坏大范围高应力煤体,引起的煤体力学参数和位移变化均比“细水慢割”式大,试验现场大量煤和瓦斯从孔口喷出。最后权衡煤体消突和喷孔可控2个方面,确定15 MPa、160 r/min为试验矿井最佳割缝水压和钻机钻速。
In order to effectively control the jet hole phenomenon of hydraulic kerf drilling, the mechanism of jet hole was analyzed systematically, and two hydraulic kerf ways of “strong water fast cutting” and “thin water slow cutting” were proposed. By FLAC3D numerical simulation and Field engineering practice, focusing on the different kerf mode on the jet hole. The results show that the hydraulic quick cutting method can quickly and violently destroy a large area of high stress coal, causing the changes of coal mechanics parameters and displacements to be greater than that of “slow water cut” A large number of coal and gas on the site were ejected from the orifice. Lastly, we balance the two aspects of controllability of the coal body and the control of the injection hole, and determine 15 MPa and 160 r / min as the best cutting hydraulic pressure and drilling speed of the drilling rig.