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<p>The dynamic mechanical behavior and failure mechanisms of sodium silicate (SS) and epoxy resin (ER) grouted coral reef limestone (CRL) are investigated in this study through Split Hopkinson Pressure Bar (SHPB) tests and multiscale characterization. Results reveal that grouting enhances quasi-static compressive strength by 76% for sodium silicate-grouted CRL (CRL-SS) and 200% for epoxy resin-grouted CRL (CRL-ER), with dynamic strength increasing by 132% (CRL-SS) and 305% (CRL-ER), respectively, at 120 s<sup>-1</sup> strain rate, both following power-law strain-rate dependencies. Energy dissipation density exhibits a linear correlation with dynamic strength. Fractal dimension analysis demonstrates reduced fracture complexity post-grouting (CRL: 1.79–2.43; CRL-SS: 1.33–2.02; CRL-ER: 0.05–1.38), with CRL-ER exhibiting superior energy efficiency per unit mass at equivalent fractal complexity. While CRL undergoes pore-dominated brittle fracture, CRL-SS fails via interfacial debonding and halite-induced microcracking under high strain rates, whereas CRL-ER maintains integrity through Ca<sup>2+</sup>-epoxy coordination bonds. These findings establish ER as optimal for high-energy marine environments (e.g., typhoon impacts) and SS for static applications, advancing strain-rate-adaptive grouting strategies for coral reef engineering.</p>

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Dynamic Characteristics and Energy Dissipation Laws of Reinforced Porous Coral Reef Limestone

  • 期刊论文

  • 发表日期：

    2025年6月16日

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  • Da Mei,
  • Xiaoqing Wei,
  • Yi Luo,
  • Shangyuan Chen,
  • Xinping Li,
  • Junhong Huang,
  • Chunneng Yang

摘要

The dynamic mechanical behavior and failure mechanisms of sodium silicate (SS) and epoxy resin (ER) grouted coral reef limestone (CRL) are investigated in this study through Split Hopkinson Pressure Bar (SHPB) tests and multiscale characterization. Results reveal that grouting enhances quasi-static compressive strength by 76% for sodium silicate-grouted CRL (CRL-SS) and 200% for epoxy resin-grouted CRL (CRL-ER), with dynamic strength increasing by 132% (CRL-SS) and 305% (CRL-ER), respectively, at 120 s-1 strain rate, both following power-law strain-rate dependencies. Energy dissipation density exhibits a linear correlation with dynamic strength. Fractal dimension analysis demonstrates reduced fracture complexity post-grouting (CRL: 1.79–2.43; CRL-SS: 1.33–2.02; CRL-ER: 0.05–1.38), with CRL-ER exhibiting superior energy efficiency per unit mass at equivalent fractal complexity. While CRL undergoes pore-dominated brittle fracture, CRL-SS fails via interfacial debonding and halite-induced microcracking under high strain rates, whereas CRL-ER maintains integrity through Ca2+-epoxy coordination bonds. These findings establish ER as optimal for high-energy marine environments (e.g., typhoon impacts) and SS for static applications, advancing strain-rate-adaptive grouting strategies for coral reef engineering.