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对高压水射流的结构以及冲击结构进行分析,在此基础上构建水射流的破煤力学模型,运用ANSYS/Ls-Dyna有限元分析技术对高压水射流破煤效果进行动力学分析,得出高压水射流在破碎煤体过程中形成槽孔的结论,由于煤层内部压力的变化使槽孔周围煤体发生破裂,出现了大量的裂隙,增加了煤层的透气性,为瓦斯的释放创造了有利条件。
The structure and impact structure of high pressure water jet were analyzed. On the basis of this, the mechanical model of broken coal in water jet was built. The dynamic analysis of high pressure water jet coal breaking effect was carried out by ANSYS / Ls-Dyna finite element analysis technology. The water jet formed a slot in the process of crushing the coal. Due to the change of internal pressure in the coal seam, the coal body around the slot ruptured, a large number of fractures appeared, which increased the permeability of the coal seam and created favorable conditions for gas release .