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<p>The failure of the rock-concrete interface are significantly important for geotechnical engineering design and disaster prediction assessments, with rock hardness severely influencing the composite structure stability. This study aims to achieve disaster prediction and stability assessment of rock-concrete interfaces through electric potential (EP) monitoring. We conducted EP monitoring tests on Brazilian splitting of rock-concrete composite disks under hard rock and soft rock conditions. The progressive failure mechanisms of composite disks was investigated through EP response. Through various roughness parameters of fracture surfaces and microcrack mechanisms, the rock hardness effects on failure behaviors were revealed. Nonlinear statistical methods through EPs were employed to investigate damage evolution and precursor information on sample failure. The results indicate that the EPs respond well to the stress state of composite disks and are affected by rock hardness. The EPs exhibit multifractal and superstatistical characteristics, with scale invariance in timescale. Compared to the hard rock condition, the soft rock-concrete composite disk displays larger Δ<i>α</i> and <i>q</i>, but a smaller Δ<i>f</i>, which is relative to their progressive failure behaviors. The rock hardness alters the progressive failure process and failure modes. With decreasing rock hardness, crack propagation begins at the interface, and crack propagation in concrete occurs gradually later, and an increase in shear crack proportion. Meanwhile, the 3D fractal dimension and 3D roughness coefficient increases. The <i>q</i>, Δ<i>α</i> and Δ<i>f</i> exhibit abnormal precursor features before sample failure, with <i>q</i> showing an earlier precursor. These findings provide valuable insights for the early warning of rock-concrete composite instability and geotechnical engineering design.</p>

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Investigation on Brazilian Failure Evolution and Electric Potential Response of Sandstone-Concrete Interface Through Multiple Nonlinear Statistical Approaches

  • 期刊论文

  • 发表日期：

    2025年9月15日

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  • Tiancheng Shan,
  • Zhonghui Li,
  • Enyuan Wang,
  • Xin Zhang,
  • Haishan Jia,
  • Yunpeng Zhang,
  • Yue Niu,
  • Dong Chen

摘要

The failure of the rock-concrete interface are significantly important for geotechnical engineering design and disaster prediction assessments, with rock hardness severely influencing the composite structure stability. This study aims to achieve disaster prediction and stability assessment of rock-concrete interfaces through electric potential (EP) monitoring. We conducted EP monitoring tests on Brazilian splitting of rock-concrete composite disks under hard rock and soft rock conditions. The progressive failure mechanisms of composite disks was investigated through EP response. Through various roughness parameters of fracture surfaces and microcrack mechanisms, the rock hardness effects on failure behaviors were revealed. Nonlinear statistical methods through EPs were employed to investigate damage evolution and precursor information on sample failure. The results indicate that the EPs respond well to the stress state of composite disks and are affected by rock hardness. The EPs exhibit multifractal and superstatistical characteristics, with scale invariance in timescale. Compared to the hard rock condition, the soft rock-concrete composite disk displays larger Δα and q, but a smaller Δf, which is relative to their progressive failure behaviors. The rock hardness alters the progressive failure process and failure modes. With decreasing rock hardness, crack propagation begins at the interface, and crack propagation in concrete occurs gradually later, and an increase in shear crack proportion. Meanwhile, the 3D fractal dimension and 3D roughness coefficient increases. The q, Δα and Δf exhibit abnormal precursor features before sample failure, with q showing an earlier precursor. These findings provide valuable insights for the early warning of rock-concrete composite instability and geotechnical engineering design.