采用光滑粒子流体动力学（SPH）方法分析脉冲射流破岩的动力学过程，可以很好地避免传统有限元方法（FEM）在处理大变形问题时的网格畸变问题。引入J-H-C模型利用SPH方法建立了脉冲射流破岩的数值计算模型。利用该方法模拟了脉冲射流在破岩过程中应力波的形成、传播及衰减的过程。通过计算分析应力波在时间上和空间上的变化规律，绘出了应力波在传播过程中的波形图，并分析了脉冲射流冲击煤岩的过程中应力波传播的时间及空间特性；另外还发现应力波在不同岩石介质中的传播特性是不同的，对不同岩石的破坏效果也有较大差异，结合岩石材料特性及波的传播特性对计算结果进行了分析解释。数值计算的结果与实际冲击情况相吻合，对脉冲射流破岩的工程应用具有一定的指导意义。

Using the method of smooth particle hydrodynamics (SPH) to analyze the dynamic process of pulse jet breaking rock is an efficient way to avoid the problems of mesh distortion that occurred in traditional finite element method (FEM) in dealing with large deformation problems. The paper designs a numerical calculation model of the pulse jet breaking rock by introducing the J-H-C model and using the SPH method. The formation，propagation and attenuation of stress waves during the process of coal broken are simulated by use of this method. Through the analysis of stress wave changing law in time and space，the paper draw the stress wave pattern in the propagation process，and obtain the time characteristics and position characteristics of the propagation of stress waves during the process of pulse jet breaking coal rock. It is also found that the propagation characteristics of stress waves and the degrees of damage in different rock mediums are different. The calculation results are explained according to the analysis of the rock properties and wave propagation characteristics. The results of simulate process are identical with reality and had partly guiding significance to the engineering usage.