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中文摘要：
针对开采保护层不能实现本层煤解放的问题，将高压水射流切割技术应用于煤层卸压。通过应用边界理论研究高压水射流切割煤体的过程，揭示了高压水射流切槽煤层冲击地压解危机理。由于射流随喷头后退式移动，因而射流是紧贴着割开的煤层的壁面而流动，将受到固壁摩擦阻力的作用，在切槽中形成三面附壁射流。应用量级比较法和量纲和谐原理计算了射流最大流速，应用应力波在煤体中的传播理论计算了最大切割深度，并对煤体切槽后的卸压范围进行了估算。结果表明，将高压水射流切割技术用于煤层卸压，不仅能够实现本层煤的卸压而且可能克服地质条件等诸多因素的限制，煤体切槽后卸压范围可达到5m，卸压效果较好。该方法用于煤层卸压有发展前景。
英文摘要：
Because mining protective layer cannot realize the release of the pressure of self-layer, the technique of high-pressure water jet cutting was applied to release the pressure of coal layer. Through the theory of boundary layer the process of high-pressure water jet applied to cutting coal seam was researched. The mechanism of dispelling rockburst danger was revealed. Because the jet flow moves back with the blow head closing the coal wall so it has three solid boundaries and is affected by the friction of the solid boundaries. The method of quantitative comparison and the principle of dimension invariance were used to calculate the maximum of jet velocity. The theory of stress wave motion was applied to calculate the maximum of the cutting depth and forecast the area of releasing pressure. The results show that this technique can not only realize the release of the pressure of self-layer but also solve the problems of some conditions such as geological structure. The area of releasing pressure can reach 5m after cutting coal seam; the effect of releasing pressure is satisfactory. Therefore this technique is very prospective.
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