考虑电性参数变化的高压电脉冲破岩机理及规律  

Rock Breaking Mechanism and Rule of High Voltage Electric Pulse Considering the Change of Electrical Parameters

作　　者：饶平平[1] 焦大维 崔纪飞 冯伟康 

机构地区：[1]上海理工大学环境与建筑学院,上海 [2]同济大学上海自主智能无人系统科学中心,上海

出　　处：《土木工程》2024年第12期2357-2369,共13页Hans Journal of Civil Engineering

摘　　要：为研究高压电脉冲击穿过程对岩石破碎的影响,综合考虑击穿过程中岩石电导率和介电常数变化对电击穿作用的影响,利用COMSOL Multiphysics仿真软件建立了基于电场、传热场和固体力学场的多物理场耦合数值模型。结果表明:在本文参数条件下,考虑电性参数(电导率和介电常数)变化带来的影响时,形成完整的电击穿通道的时间发生延迟,且在约0~170 ns时间内电性参数变化对应的最高温度不高于电性参数为定值对应的最高温度,在约170 ns之后则相反。电极间距不同,电脉冲形成的击穿通道形式不同,最大电流密度随电极间距增大而减小,击穿通道温度可达104 K。电压上升到达峰值的时间越长,岩石的破碎越充分,最大应力可达103 MPa。研究结论可为高压电脉冲破岩参数的选取提供参考和借鉴。To investigate the impact of high-voltage electrical pulse breakdown on rock fragmentation and changes in rock conductivity and dielectric constant during breakdown, a multi-physics coupling numerical model based on electric field, heat transfer field, and solid mechanics field was established using COMSOL Multiphysics simulation software. The results indicate that considering changes in electrical parameters (electrical conductivity and dielectric constant) delays the time required to form a complete electrical breakdown channel. Moreover, the maximum temperature corresponding to changes in electrical parameters does not exceed that corresponding to fixed values by more than 0~170 ns;however, after approximately 170 ns, this relationship reverses. The maximum current density decreases as electrode spacing increases while the temperature within the breakdown channel can reach up to 104 K. Longer voltage rise times result in complete rock fragmentation with maximum stress reaching up to 103 MPa. These research findings provide valuable guidance for selecting optimal.

关 键 词：高压电脉冲 多场耦合 电性参数 岩石破碎 

分 类 号：TG1[金属学及工艺—金属学]