为了探究环境介质对水射流破煤特征的影响规律，采用ALE算法和LS-Dyna软件开展了连续水射流冲击破煤数值模拟研究，分析了淹没/非淹没环境下水射流传播特征、破煤特征，及两者破煤深度关系的时变特征。结果表明：由于水射流损耗较大，淹没环境下射流传播速度远小于非淹没状态下；淹没射流在环境介质的阻碍下发散导致破煤面积增大及深度降低，但损伤单元变化不大；淹没环境下开展破煤造穴时需要合理延长冲击时间或者缩小钻孔间距。

In order to explore the influence of environmental media on the characteristics of water jet coal breaking, ALE algorithm and LS-Dyna software are used to carry out numerical simulation of continuous water jet impact coal breaking and the characteristics of water jet propagation, coal breaking characteristics and time-varying characteristics of the relationship between the two coal breaking depths under the submerged and non-submerged environments are analyzed. The results show that because of the large loss of water jet, the jet velocity in submerged environment is much lower than that in non-submerged state. Under the obstruction of environmental medium, the submerged jet diverges and increases the area of broken coal, resulting in the increase of the area of broken coal and the decrease of the depth, but the damage element does not change much. It is necessary to prolong the impact time reasonably or reduce the spacing of boreholes when coal caving is carried out in submerged environment.