摘要
高压水射流破岩是一个涉及诸多因素的复杂的非线形动力学问题,利用非线形有限元法,采用动态接触模拟高压水射流对岩石冲击作用。结果显示岩石内部最初受到冲击时的不稳定性由强变弱,反映了岩石的动态响应特性;模拟了在不同冲击速度下应力波在岩石中的传播和衰减过程,结果表明应力波的传播速度与冲击速度成正比,射流速度越大,应力波衰减越快;同时还模拟了以相同的速度分别冲击砂岩和煤时的应力波效应,计算表明在相同的冲击速度下,射流冲击煤的局部性效应比冲击砂岩时更为显著,应力波在砂岩中的传播范围要广泛一些。
The evolvement of rock damage struck by a high-pressure water jet is characterized by nonlinear properties, thus making it a complicated dynamic problem. Based on a nonlinear finite element and elasticplasticity theory, a computational model was established. The dynamic load striking the rock by a highpressure water jet was simulated by the dynamic contact method. Furthermore, the propagation of a stress wave in the same rock was simulated at different impact velocities. The results show that the propagation velocity of a stress wave is proportional to the impact velocity of the high-pressure water jet. The effects of a stress wave in sandstone and coal impacted by high-pressure water jets of the same velocity were simulated. The effect of a stress wave in coal was stronger than in sandstone, while the region of propagation of stress wave in coal was smaller.
出处
《重庆大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2008年第8期942-945,950,共5页
Journal of Chongqing University
基金
国家自然科学基金创新团队资助项目(5062140)
关键词
高压水射流
有限元法
应力波
冲击载荷
high-pressure water jet
finite element method
stress wave
impact load
