Scholarlink

<p>This study investigates the freeze–thaw behavior of water-saturated fractured granite through combined laboratory freeze–thaw and uniaxial eccentric loading tests, integrated with stress, temperature, and acoustic emission (AE) monitoring to track the evolution of frost heave stress and fracture propagation within rock bridges. Numerical simulations were further employed to evaluate the physico-mechanical degradation induced by freeze–thaw damage. The results show a strong linear correlation between temperature and wave velocity fields; based on this relationship, a non-uniform wave velocity field AE localization method was developed, improving localization accuracy by approximately 54%. The frost heave stress within saturated fractures exhibits a fluctuating decreasing trend with increasing freeze–thaw cycles. The fracture network within rock bridges evolves in a staged manner. In the early stage (1–3 cycles), fractures propagate rapidly, with the connected fracture area increasing from 5.8% to 26.3%, dominated by tensile failure. In the intermediate stage (around the 4th cycle), fractures begin to coalesce, with the connected area reaching 34.23% and failure transitioning to a tensile–shear mixed mode. In the late stage (≥9 cycles), fracture growth slows, the connected area increases to 37%, and shear failure becomes dominant, with structural instability governed primarily by fracture connectivity. With increasing freeze–thaw cycles, the peak strength decreases significantly, while the displacement rotation center migrates downward from the upper to the lower part of the rock bridge, and the macroscopic failure mode transitions from convex to concave. These findings elucidate the mechanisms of crack propagation and mechanical degradation of fractured rocks under freeze–thaw conditions, providing a basis for evaluating the long-term stability of fractured rock slopes in cold regions.</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

Acoustic Emission-Based Investigation of Freeze–Thaw-Induced Fracture Propagation and Damage Evolution in Water-Saturated Rock

  • 期刊论文

  • 发表日期：

    2026年6月16日

查看全文
  • Zhang Penghai,
  • Ma Qingshan,
  • Meng Lingren,
  • Liu Honglei,
  • Huang Haiting,
  • Yang Tianhong

摘要

This study investigates the freeze–thaw behavior of water-saturated fractured granite through combined laboratory freeze–thaw and uniaxial eccentric loading tests, integrated with stress, temperature, and acoustic emission (AE) monitoring to track the evolution of frost heave stress and fracture propagation within rock bridges. Numerical simulations were further employed to evaluate the physico-mechanical degradation induced by freeze–thaw damage. The results show a strong linear correlation between temperature and wave velocity fields; based on this relationship, a non-uniform wave velocity field AE localization method was developed, improving localization accuracy by approximately 54%. The frost heave stress within saturated fractures exhibits a fluctuating decreasing trend with increasing freeze–thaw cycles. The fracture network within rock bridges evolves in a staged manner. In the early stage (1–3 cycles), fractures propagate rapidly, with the connected fracture area increasing from 5.8% to 26.3%, dominated by tensile failure. In the intermediate stage (around the 4th cycle), fractures begin to coalesce, with the connected area reaching 34.23% and failure transitioning to a tensile–shear mixed mode. In the late stage (≥9 cycles), fracture growth slows, the connected area increases to 37%, and shear failure becomes dominant, with structural instability governed primarily by fracture connectivity. With increasing freeze–thaw cycles, the peak strength decreases significantly, while the displacement rotation center migrates downward from the upper to the lower part of the rock bridge, and the macroscopic failure mode transitions from convex to concave. These findings elucidate the mechanisms of crack propagation and mechanical degradation of fractured rocks under freeze–thaw conditions, providing a basis for evaluating the long-term stability of fractured rock slopes in cold regions.