高压水射流破岩的数值模拟分析

NUMERICAL SIMULATION ON ROCK BREAKING UNDER HIGH PRESSURE WATER

采用非线性动力有限元法和岩石动态损伤模型对高压水射流破岩过程进行了模拟,结果表明,水射流破碎岩石主体所用的时间为毫秒量级,普通连续水射流破岩的主要形式是卸载及射流冲击所产生的拉伸破坏,并呈“阶跃式”发展。在此基础上,探索了水射流参数对破岩效果的影响,数值计算与试验结果吻合良好,表明利用该方法分析水射流破岩过程和机理是可行的,所得结论可作为水射流破岩体系设计和优化的依据。

The evolvement of rock damage impacted by high pressure water jet is simulated with nonlinear FEM and dynamic rock damage model. The numerical results show that most of rock damage and breakage take place in several milliseconds,the main damage behavior under a general continual jet is tensile damage caused by the rock unload and the jet impacting,and the evolvement of rock damage shows step changed. The effect of water jet parameters on rock breaking is studied. The numerical results agree well with experimental results,so that the method established in this paper can simulate rock breaking under high pressure water jet and the study results can be used to design and optimize rock breaking under water jet.