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<p>Nonlinear compaction deformation is a universal mechanical property of rocks subjected to environmental erosion, and the neglect of this property in existing damage constitutive models leads to considerable deviations in the mechanical prediction of rock masses in reservoir banks, slopes and underground engineering projects worldwide. Dolomite, a typical carbonate rock widely distributed in dry-hot valley reservoirs across Southwest China, Southeast Asia, Africa and South America, is susceptible to severe water–rock interaction damage induced by thermal-wet cycles, a prevalent engineering geological issue in carbonate rock areas globally. Taking dolomite as the research object, this study proposes a statistical damage variable definition method to characterize the deformation in the nonlinear compaction stage, and establishes a segmented damage constitutive model considering the coupling effect of thermal-wet cycle-induced water-rock interaction damage and load-induced damage. The model is validated by uniaxial compression tests, while a combination of SEM, NMR and solution chemistry analyses is applied to reveal the deterioration mechanism of dolomite under thermal-wet cycles. Furthermore, a quantitative characterization method for pore damage and skeleton damage of rocks under water-rock interaction is developed, which addresses the research deficiency in constitutive models for environmentally eroded rocks with prominent compaction characteristics.</p>

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Constitutive model and thermal-induced damage behaviors of dolomite subjected to water–rock interaction

  • 期刊论文

  • 发表日期：

    2026年5月7日

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  • Yening Huang,
  • Huafeng Deng,
  • Jianlin Li,
  • Zhuofen Li,
  • Jingyu Zhang,
  • Yunjie Feng,
  • Shuhuan Zhou,
  • Anlong Hu

摘要

Nonlinear compaction deformation is a universal mechanical property of rocks subjected to environmental erosion, and the neglect of this property in existing damage constitutive models leads to considerable deviations in the mechanical prediction of rock masses in reservoir banks, slopes and underground engineering projects worldwide. Dolomite, a typical carbonate rock widely distributed in dry-hot valley reservoirs across Southwest China, Southeast Asia, Africa and South America, is susceptible to severe water–rock interaction damage induced by thermal-wet cycles, a prevalent engineering geological issue in carbonate rock areas globally. Taking dolomite as the research object, this study proposes a statistical damage variable definition method to characterize the deformation in the nonlinear compaction stage, and establishes a segmented damage constitutive model considering the coupling effect of thermal-wet cycle-induced water-rock interaction damage and load-induced damage. The model is validated by uniaxial compression tests, while a combination of SEM, NMR and solution chemistry analyses is applied to reveal the deterioration mechanism of dolomite under thermal-wet cycles. Furthermore, a quantitative characterization method for pore damage and skeleton damage of rocks under water-rock interaction is developed, which addresses the research deficiency in constitutive models for environmentally eroded rocks with prominent compaction characteristics.