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Effect of high-voltage electric pulse stimulation on heated-granite: An experimental investigation

高压电脉冲刺激对于热处理花岗岩影响的实验研究

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Abstract

High-voltage electric pulse (HVEP) technology merits further investigation into its potential applications. The effectiveness of using HVEP to induce pre-damage and deteriorate hot dry rock (HDR) was investigated in this study. Different peak voltages of HVEP were applied to heated-granite flake specimens. Furthermore, the influence of temperature on HVEP stimulating granite was investigated. The results show that when the applied peak voltages exceeded 96 kV, through-fracture failure occurred in the heated-granite specimens, with higher voltages producing more complex through-fracture networks. The microcrack density of granite specimens increased from 8.63 mm/mm2 to 13.26 mm/mm2 when the applied voltage rose from 96 kV to 144 kV. Notably, the difficulty of granite electrical breakdown gradually decreased with the increasing temperature of thermal treatment. Through-fracture failures were observed in all granite specimens heated above 400 °C after three HVEP discharges at 120 kV. The maximum damage caused by HVEP was found within the temperature range of 300–400 °C. Additionally, an escalation in the development of internal pores and cracks as the granite specimen temperature increased was observed by using scanning electron microscopy (SEM), accompanied by an increase in pore size and crack width and depth.

摘要

高压电脉冲技术作为一种环保、可控、高效的破碎坚硬岩石的方法, 其潜在应用场景值得进一 步深入发掘。本文研究了高压电脉冲诱导干热岩产生预损伤和劣化方法的效果。对热处理后花岗岩薄 片试样施加了不同峰值电压的高压电脉冲刺激, 探讨了高压电脉冲对于热处理花岗岩的影响。此外, 还研究了初始温度对高压电脉冲刺激花岗岩的影响。结果表明:当外加峰值电压超过96 kV时, 热处 理花岗岩试样发生贯穿性的破裂, 峰值电压越高, 贯穿裂纹网络越复杂。当电压从96 kV增加到144 kV 时, 花岗岩试样的微裂纹密度从8.63 mm/mm2增加到13.26 mm/mm2。随着热处理温度的升高, 花 岗岩发生电击穿的难度逐渐降低。在120 kV电脉冲放电刺激3 次后, 所有热处理温度高于400 ℃的花 岗岩试样均能发生贯穿破裂。高压电脉冲刺激造成花岗岩产生的最大损伤发生在300∼400 ℃的温度区 间内。通过扫描电子显微镜观察到, 随着试样处理温度的升高, 内部孔隙和裂缝的发育情况逐渐加 剧, 孔隙大小、裂缝宽度和深度也随之增加。这项研究有望为建造干热岩人工储层提供新的见解。

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Authors and Affiliations

  1. School of Resources and Safety Engineering, Central South University, Changsha, 410083, China

    Tu-bing Yin  (尹土兵), Cheng-hui Liu  (刘程辉), Deng-deng Zhuang  (庄登登) & **-bing Li  (**夕兵)

  2. Oulu Mining School, University of Oulu, Oulu, FI-90014, Finland

    Deng-deng Zhuang  (庄登登)

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  1. Tu-bing Yin  (尹土兵)
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Contributions

YIN Tu-bing provided funding and resources. ZHUANG Deng-deng contributed to investigation, validation, formal analysis, writing-review and editing. LIU Cheng-hui contributed in writing-original draft, methodology, and data organization. LI **-bing guided the whole process.

Corresponding author

Correspondence to Deng-deng Zhuang  (庄登登).

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YIN Tu-bing, LIU Cheng-hui, ZHUANG Deng-deng and LI **-bing declare that they have no conflict of interest.

Additional information

Foundation item: Project(41972283) supported by the National Natural Science Foundation of China; Project(2023JJ306623) supported by the Hunan Provincial Natural Science Foundation of China; Project(2023ZZTS802) supported by the Fundamental Research Funds for the Central Universities, China

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Yin, Tb., Liu, Ch., Zhuang, Dd. et al. Effect of high-voltage electric pulse stimulation on heated-granite: An experimental investigation. J. Cent. South Univ. 31, 1526–1541 (2024). https://doi.org/10.1007/s11771-024-5619-2

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