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为了精确估算深部煤岩体切割深度,提高射流的切割功效,利用自行设计的磨料射流切割系统,采用圆锥收敛型喷嘴以3种不同的冲蚀切割方式对重庆煤矿f值为3.14的底板泥质灰岩进行切割实验.结果表明:在系统泵压恒为30MPa压力下,磨料质量分数控制在8%～10%之间,射流切割的终止深度受靶距影响较小,与喷嘴的移动速度密切相关,终止深度随喷嘴移动速度的增加呈对数关系减少,但固定冲蚀时并非最大,约为最大终止深度的90%;随着移动速度的增加,达到终止切割深度所用往复次数增加,单次切割深度减少;通过对移动速度与切割深度关系的分析,建立了基于煤岩体移动切割的深度模型,经F检验函数检验,模型可信度较高,具有很好的指导意义.
In order to accurately estimate the cutting depth of deep coal and rock mass and improve the cutting efficiency of the jet, the conical convergent nozzle was used to cut the mud of the floor of Chongqing coal mine with f value of 3.14 by using 3 different erosion cutting methods. The results show that under the pressure of 30MPa, the mass fraction of abrasive is controlled between 8% and 10%, and the final depth of jet cutting is less affected by the target distance and close to the nozzle’s moving speed , The termination depth decreases logarithmically with increasing nozzle travel speed, but it is not the largest at fixed erosions, which is about 90% of the maximum termination depth. As the moving speed increases, the number of reciprocations reaching the end cut depth increases The depth of sub-cut is reduced. Based on the analysis of the relationship between the moving speed and the depth of cut, a depth model based on the mobile cutting of coal and rock mass is established. The F-test function tests show that the reliability of the model is high, which is of great guiding significance.