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中文摘要：
为了确定不同硬度的煤在高压水射流破煤时所需的破煤压力,以淮南矿业集团潘三矿和谢桥矿为试验点,通过理论计算把实际用的多喷嘴转化为计算用的当量喷嘴,通过当量直径和流量系数计算出水射流的压力,再扣除管路系统的压力损失就能得出高压水射流的出口压力.再结合矿井的实际条件可知实验煤层的坚固性系数,通过拟合的煤层抗压强度与煤的坚固性系数关系σc=10f就可得出煤的临界抗压强度.从而得出水力冲孔高压水射流所需的破煤压力,理论分析并结合实际考察得出合理的破煤压力取8~15MPa比较合理.
英文摘要：
In order to determine breaking - coal pressure of different hardness coal by high pressure water jet, nozzles in the real application are transformed into equivalent nozzle through theoretical calculation. Pressure of water jet are calculated by equivalent diameter and flow coefficient, and outlet pressure of high pressure water jet is obtained by deducting pressure loss of pipeline system. The critical compressive strength by orc = 10f are gotten with the fitting of coal seam compressive strength and the strength coefficient of coal by combining with actual condition of experimental mine. By theoretical analysis and practical investigation, the reasonable high pressure water jet of actual broken coal is 8 - 18MPa.
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