| 基于COMSOL的高压放电破碎岩石仿真研究 |
| 投稿时间：2022-01-19 修订日期：2022-07-22 点此下载全文 |
| 引用本文：马宁,金博,周鹏,等.基于COMSOL的高压放电破碎岩石仿真研究[J].钻探工程,2022,49(6):62-70.MA Ning,JIN Bo,ZHOU Peng,et al. Simulation study on high voltage discharge rock breaking based on COMSOL[J]. Drilling Engineering, 2022,49(6):62-70. |
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| 中文摘要:常规旋挖钻机在钻进硬岩地层钻孔桩时存在进尺困难，钻头磨损大等问题。高压脉冲放电岩石破碎技术作为一种新型非机械式岩石破碎技术，在硬岩钻进领域具有广阔的应用前景。本文在分析高压脉冲放电破碎岩石机理的基础上，运用COMSOL Multiphusics软件，建立电-热-力多物理场耦合模型，开展花岗岩和砂岩在电压、电极间距、电解质等条件下的破碎规律仿真研究。结果表明，随着电压的增大，岩石产生的破碎区域呈线性增大；电极间距的增大导致岩石破碎区域减小；液体介质的电导率大小对放电结果的影响不大；选用多电极对放电可有效增加岩石的破碎面积。研究结果可为高压放电破碎岩石技术提供参考。 |
| 中文关键词:高压放电 岩石破碎 硬岩钻进 旋挖钻进 等离子通道 破岩机理 COMSOL |
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| Simulation study on high voltage discharge rock breaking based on COMSOL |
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| Abstract:As a new non-mechanical rock breaking technology， high voltage pulse discharge rock crushing technology has a broad application prospect in hard rock drilling. In this paper， based on the analysis of the mechanism of rock crushing by high voltage pulse discharge， the COMSOL Multiphusics software is used to establish the electric-thermo-mechanical multi-physical field coupling model， and to carry out the simulation research on the breaking law of granite and sandstone under the action of voltage， electrode spacing， electrolyte and other conditions. The results show that the broken area of rock increases linearly with the increase of voltage. The increase in electrode spacing results in the decrease in the rock fragmentation area. The conductivity of liquid medium has little effect on discharge results. The broken area of rock can be increased effectively by using multi-electrode pair discharge. The results can provide reference for high voltage discharge rock crushing technology |
| keywords:high voltage discharge rock breaking hard rock drilling rotaty drilling plasma channel mechanism of rock fragmentation COMSOL |
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