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<p>Enhanced geothermal systems (EGS) offer a promising approach for sustainable energy generation, where stimulation of hot dry rock reservoirs is of critical importance. Dynamic failure mechanisms of granite subjected to thermochemical treatments were investigated experimentally. The results revealed competing mechanisms between mineral recrystallization repair and thermal–chemical damage. Below a 200°C threshold, slow natural cooling and rapid water cooling induced gradual initial damage development, whereas chemical cooling exhibited a negative cumulative trend because of dominant crystal repair effects over thermal cracking. Post-reaction fracture surfaces demonstrated hybrid brittle failure–corrosion failure–plastic deformation characteristics. Cyclic impact tests revealed that chemically and naturally cooled samples exhibited prolonged fatigue life compared with their water-cooled counterparts. These results highlighted the detrimental role of thermal stress gradients in water cooling-induced damage resistance reduction. A three-stage cyclic impact damage evolution model was established and was consistent with experimental observations. These findings provide critical insight for optimizing thermochemical preconditioning strategies and enhancing geothermal reservoir fracturing efficiency.</p>

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Experimental Investigations on Impact Fatigue Properties of Granite after Thermochemical Treatment

  • 期刊论文

  • 发表日期：

    2026年7月7日

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  • Zhi Wang,
  • Qingyu Yan,
  • Haopeng Lv,
  • Peng Li

摘要

Enhanced geothermal systems (EGS) offer a promising approach for sustainable energy generation, where stimulation of hot dry rock reservoirs is of critical importance. Dynamic failure mechanisms of granite subjected to thermochemical treatments were investigated experimentally. The results revealed competing mechanisms between mineral recrystallization repair and thermal–chemical damage. Below a 200°C threshold, slow natural cooling and rapid water cooling induced gradual initial damage development, whereas chemical cooling exhibited a negative cumulative trend because of dominant crystal repair effects over thermal cracking. Post-reaction fracture surfaces demonstrated hybrid brittle failure–corrosion failure–plastic deformation characteristics. Cyclic impact tests revealed that chemically and naturally cooled samples exhibited prolonged fatigue life compared with their water-cooled counterparts. These results highlighted the detrimental role of thermal stress gradients in water cooling-induced damage resistance reduction. A three-stage cyclic impact damage evolution model was established and was consistent with experimental observations. These findings provide critical insight for optimizing thermochemical preconditioning strategies and enhancing geothermal reservoir fracturing efficiency.