Study on the Influence of Magnetic Field on Plasma Channel in the Process of Rock Breaking by Electric Pulse

高压电脉冲破岩技术是一种新型高效的破岩方法。文章利用COMSOL Multiphysics仿真软件构建了电–热–力–磁多物理场耦合的岩石电击穿数值模型。研究结果表明，磁场的存在对岩石内部等离子体通道的形成有一定影响，在改变通道形状的同时增大了岩石的损伤面积。在外部磁场的作用下，等离子体通道逐渐趋向于岩石内部发展。本研究可为高压电脉冲破岩技术的发展提供一定的理论依据，以及为电脉冲破岩设备的开发和参数优化提供参考。High-voltage electric pulse rock-breaking technology is a new and efficient rock-breaking method. In this paper, COMSOL Multiphysics simulation software is used to construct a numerical model of rock electrical breakdown coupling of electric-heat-force-magnetic multiple physical fields. The results show that the presence of a magnetic field has a certain influence on the formation of plasma channels in rocks, which changes the shape of channels and increases the damage area of rocks. Under the action of the external magnetic field, the plasma channel gradually tends to develop inside the rock. The research in this paper can provide a certain theoretical basis for the development of high-voltage electric pulse rock-breaking technology and provide a reference for the development and parameter optimization of electric pulse rock-breaking equipment.