Mechanism of rock breaking by high voltage electric pulse liquid plasma shockwave breaking

IF 2.1 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Journal of Applied Geophysics Pub Date : 2025-09-22 DOI:10.1016/j.jappgeo.2025.105962

Weiji Liu , Jiahui Zhang , Wuji Tang , Xiaohua Zhu , Siqi Liu , Xin Zhou

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引用次数: 0

Abstract

The liquid-phase discharge plasma shock wave rock breaking is a novel technique based on the “liquid-electric effect,” featuring controllable energy output, operational stability, and low cost. In this study, a three-dimensional multi-physics coupling model was developed, incorporating five interrelated physical fields: electric circuit field, current field, heat transfer field, fluid dynamics, and solid mechanics. The model is governed by the laws of energy conservation, Maxwell's equations, conjugate heat transfer equations, and the Navier–Stokes equations, enabling detailed simulation of plasma channel formation and underwater shock wave propagation. The Mohr–Coulomb criterion was employed to evaluate rock failure behavior. To validate the accuracy of the simulation model, indoor experiments were conducted to elucidate the rock breaking mechanism of LPSB. Furthermore, a series of controlled experiments was conducted to investigate the influence of initial charging voltage and electrode spacing on rock-breaking efficiency. The optimal parameter ranges were determined to be 120 to 140 kV for charging voltage and 10 to 12 mm for electrode spacing. These findings provide both theoretical insight and experimental guidance for the advancement and engineering application of LPSB technology.

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高压电脉冲液体等离子体冲击波破岩机理研究

液相放电等离子体冲击波破岩技术是一种基于“液电效应”的新型破岩技术，具有能量输出可控、运行稳定、成本低等特点。在本研究中，建立了一个三维多物理场耦合模型，包括五个相互关联的物理场：电路场、电流场、传热场、流体力学和固体力学。该模型由能量守恒定律、麦克斯韦方程、共轭传热方程和纳维-斯托克斯方程控制，可以详细模拟等离子体通道形成和水下冲击波传播。采用Mohr-Coulomb准则评价岩石破坏行为。为了验证模拟模型的准确性，进行了室内试验，阐明了LPSB的破岩机理。此外，还进行了一系列对照试验，研究了初始充电电压和电极间距对破岩效率的影响。确定最佳参数范围为充电电压120 ~ 140 kV，电极间距10 ~ 12 mm。这些发现为LPSB技术的发展和工程应用提供了理论见解和实验指导。

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来源期刊

Journal of Applied Geophysics 地学-地球科学综合

CiteScore

3.60

自引率

10.00%

发文量

274

审稿时长

4 months

期刊介绍： The Journal of Applied Geophysics with its key objective of responding to pertinent and timely needs, places particular emphasis on methodological developments and innovative applications of geophysical techniques for addressing environmental, engineering, and hydrological problems. Related topical research in exploration geophysics and in soil and rock physics is also covered by the Journal of Applied Geophysics.