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<p>This study involved testing heat-treated granite using natural cooling, water cooling and acid cooling methods to evaluate and compare the effect of acid cooling on the dynamic tensile behavior of thermally treated granite. The study focused on elucidating the mechanisms through which acid cooling affects the dynamic tensile properties, mineralogical composition, and thermal shock damage characteristics of thermally treated granite, while revealing the failure evolution mechanisms of specimens under acid cooling. Results showed that increasing the temperature from 100 to 600&#xa0;°C significantly reduces P-wave velocity and dynamic tensile strength of acid-cooled samples, especially when compared to naturally cooled and water-cooled specimens. At 600&#xa0;°C, acid-cooled specimens showed a 71.0% decrease in P-wave velocity and a 61.5% reduction in dynamic tensile strength compared to room-temperature (25&#xa0;°C) specimens. XRD and EDS analyses further revealed that acid cooling synergistically accelerated mineralogical degradation through chemical corrosion and thermal stress. Additionally, granite specimens subjected to acid cooling displayed the most severe fragmentation. This study indicates that acid cooling enhances rock-breaking efficiency in hot dry rock (HDR) exploitation via thermal expansion, stress-induced damage, and chemical weakening, offering new insights for optimizing drilling technologies and controlling surrounding rock stability in geothermal engineering.</p>

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Study on the dynamic tensile properties and damage mechanisms of thermally treated granite under acid cooling

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年1月24日

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  • Tubing Yin,
  • Jinrun Song,
  • Fan Liu,
  • Yulong Zhao,
  • Shuai Li,
  • Xibing Li

摘要

This study involved testing heat-treated granite using natural cooling, water cooling and acid cooling methods to evaluate and compare the effect of acid cooling on the dynamic tensile behavior of thermally treated granite. The study focused on elucidating the mechanisms through which acid cooling affects the dynamic tensile properties, mineralogical composition, and thermal shock damage characteristics of thermally treated granite, while revealing the failure evolution mechanisms of specimens under acid cooling. Results showed that increasing the temperature from 100 to 600 °C significantly reduces P-wave velocity and dynamic tensile strength of acid-cooled samples, especially when compared to naturally cooled and water-cooled specimens. At 600 °C, acid-cooled specimens showed a 71.0% decrease in P-wave velocity and a 61.5% reduction in dynamic tensile strength compared to room-temperature (25 °C) specimens. XRD and EDS analyses further revealed that acid cooling synergistically accelerated mineralogical degradation through chemical corrosion and thermal stress. Additionally, granite specimens subjected to acid cooling displayed the most severe fragmentation. This study indicates that acid cooling enhances rock-breaking efficiency in hot dry rock (HDR) exploitation via thermal expansion, stress-induced damage, and chemical weakening, offering new insights for optimizing drilling technologies and controlling surrounding rock stability in geothermal engineering.