中文摘要：

为研究高压水射流破煤过程中煤体的损伤状态及压力的分布状态,论文采用J-H-C含损伤本构模型,水射流采用Bridgman状态方程,通过拉格朗日-欧拉有限元法模拟计算高压水射流冲击煤体的损伤机制,得出了煤体在高压水射流冲击作用下不同时刻的损伤变化情况。结果表明,煤体在高压水射流作用下,在接触点两边形成＂肺叶状＂负压力区,煤体所受压力逐渐减小;冲击速度和产生的损伤随时间变化逐渐减小,损伤主要集中于坑洞底部。

英文摘要：

To investigate mechanism of the coal damage status and the contact pressure distribution in impact process of high - pressure water jet, the J - H - C constitutive model is adopted, and the water jet is described with the equation of Bridgman state. The injury mechanism of high - pressure water jet impact coal is calculated by Lagrange - Euler finite element method, finding out the traumatic changes of coal at different time. The results show that the coal forms a ＂lung＂ negative pressure zone on the contact point under high - pressure water jet and the pressure on the coal decreases gradually. The impact speed and damage of coal decrease with the increase of time and the damage is mainly distributed at the bottom of the hole.