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<p>High-temperature treatment has a pronounced influence on the micromechanical behavior of granite. In this study, in-situ nanoindentation was carried out to investigate the creep behavior of quartz, plagioclase, and biotite in granite after heat treatment at 25, 300, 600, and 800 ℃. X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and backscattered electron imaging (BSE) were combined to precisely identify mineral phase distributions on sample surfaces. The time-dependent response was examined under holding times of 5&#xa0;s and 120&#xa0;s. The results indicate that heat treatment at 800 ℃ induces substantial microstructural damage, accompanied by clear reductions in Young’s modulus and hardness and a marked increase in creep displacement. Stress exponent analysis further suggests that the dominant creep mechanism of quartz and plagioclase changes from dislocation-controlled creep to diffusion- and grain-boundary-slip-controlled creep after 800 ℃, whereas biotite remains mainly dislocation-controlled. To better describe the creep response over a relatively long holding period, an improved Burgers model incorporating a time-shifted Andrade power-law term is proposed. Compared with the conventional Burgers and logarithmic models, the proposed model provides a better description of both the decelerating and steady-state creep stages and remains applicable under different mineral and thermal conditions. In addition, the pitted surface morphology of polished biotite may lead to anomalous unloading behavior. These results help clarify the microscale creep evolution of granite after high-temperature treatment and provide a useful reference for evaluating the long-term stability of rock masses in high-temperature environments.</p>

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Microscopic creep behavior of granite after high-temperature treatment characterized by nanoindentation and improved Burgers model

  • 期刊论文

  • 发表日期：

    2026年7月11日

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  • Tao Wang,
  • Yunjie Li,
  • Liyuan Liu,
  • Huihui Zhang,
  • Chongfeng Chen,
  • Chaoqiang Bai,
  • Yu Xiang

摘要

High-temperature treatment has a pronounced influence on the micromechanical behavior of granite. In this study, in-situ nanoindentation was carried out to investigate the creep behavior of quartz, plagioclase, and biotite in granite after heat treatment at 25, 300, 600, and 800 ℃. X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and backscattered electron imaging (BSE) were combined to precisely identify mineral phase distributions on sample surfaces. The time-dependent response was examined under holding times of 5 s and 120 s. The results indicate that heat treatment at 800 ℃ induces substantial microstructural damage, accompanied by clear reductions in Young’s modulus and hardness and a marked increase in creep displacement. Stress exponent analysis further suggests that the dominant creep mechanism of quartz and plagioclase changes from dislocation-controlled creep to diffusion- and grain-boundary-slip-controlled creep after 800 ℃, whereas biotite remains mainly dislocation-controlled. To better describe the creep response over a relatively long holding period, an improved Burgers model incorporating a time-shifted Andrade power-law term is proposed. Compared with the conventional Burgers and logarithmic models, the proposed model provides a better description of both the decelerating and steady-state creep stages and remains applicable under different mineral and thermal conditions. In addition, the pitted surface morphology of polished biotite may lead to anomalous unloading behavior. These results help clarify the microscale creep evolution of granite after high-temperature treatment and provide a useful reference for evaluating the long-term stability of rock masses in high-temperature environments.