Scholarlink

<p>Although research on freeze–thaw(F-T) damage of engineering materials in cold regions is relatively mature, there remains a significant lack of research on the fracture behaviour of interfacial roughness coupled with F-T damage. For this reason, this study employed a multi-scale approach, combining shear tests, acoustic emission (AE), digital image correlation (DIC), scanning electron microscopy (SEM), and theoretical analysis. The results showed that F-T cycles significantly degraded the mechanical properties of the sandstone-concrete, while roughness effectively improved its shear resistance. Acoustic emission and DIC analyses jointly revealed that F-T action induced a shift from shear- to tensile-dominated damage modes and suppressed crack extension, while roughness induced crack bifurcation and complex fracture networks. The microscopic characterisation (SEM) further indicated that F-T-induced sandstone fracture was transformed by crystal penetration and an increase in concrete porosity. It ultimately led to the migration of the fracture path towards the concrete side. On this basis, we propose for the first time a straight shear full-stage constitutive model that takes F-T damage into account, which is in high agreement with the experimental data. The outcomes of this research provide strategic guidance for optimising design codes and developing effective maintenance strategies for infrastructure in F-T environments.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Fracture behavior and constitutive modeling of rock-concrete contact surfaces with different roughness under freeze–thaw cycles

  • 期刊论文

  • 发表日期：

    2026年8月3日

查看全文
  • Mengyuan Cui,
  • Taoying Liu,
  • Yeshan Sheng,
  • Min Tang,
  • Wenbin Cai,
  • Longjun Dong

摘要

Although research on freeze–thaw(F-T) damage of engineering materials in cold regions is relatively mature, there remains a significant lack of research on the fracture behaviour of interfacial roughness coupled with F-T damage. For this reason, this study employed a multi-scale approach, combining shear tests, acoustic emission (AE), digital image correlation (DIC), scanning electron microscopy (SEM), and theoretical analysis. The results showed that F-T cycles significantly degraded the mechanical properties of the sandstone-concrete, while roughness effectively improved its shear resistance. Acoustic emission and DIC analyses jointly revealed that F-T action induced a shift from shear- to tensile-dominated damage modes and suppressed crack extension, while roughness induced crack bifurcation and complex fracture networks. The microscopic characterisation (SEM) further indicated that F-T-induced sandstone fracture was transformed by crystal penetration and an increase in concrete porosity. It ultimately led to the migration of the fracture path towards the concrete side. On this basis, we propose for the first time a straight shear full-stage constitutive model that takes F-T damage into account, which is in high agreement with the experimental data. The outcomes of this research provide strategic guidance for optimising design codes and developing effective maintenance strategies for infrastructure in F-T environments.