岩石冲击破坏分析及其数值模拟研究

Analysis and Numerical Simulation on the Impact Failure of Rock

采用一级轻气炮驱动飞片撞击实验技术,对石灰岩在冲击载荷作用下的应力波传播效应和破坏特性进行了研究。结果表明,岩样中传播的应力波有明显的弥散效应和衰减特性;切片观测发现,冲击后岩样存在头部破损区、中部拉压破坏区和尾部裂隙区3个不同的破坏区域。在此基础上,对冲击破坏过程进行了数值模拟,其结果与实验结果比较吻合。

The propagation effect and failure characteristics of stress wave on limestone were studied by one - stage light - gas gun induced - plate impact experiment technology. The results showed that there were obvious dispersion effect and attenuation character of stress wave propagating in rock, and by sectioning and observation, it was found that there were three different failure zones in impacted rock, which were failure zone in the head, tension- compression failure zone in the middle and fracture failure zone in the tail. On this basis, numerical simulation was made on the impact - failure process of the rock, and the result of simulation was in accordance with the one of the test.