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<p>As energy extraction and space utilization extend deeper into the Earth, engineering rock is subjected to creep under in-situ stress and experiences fatigue due to cyclic loads such as vibrations and earthquakes. The time-dependent mechanical properties of rocks under complex loading conditions, such as fatigue and creep have not been fully clarified. In this study, fatigue (900&#xa0;s/step), creep (3 d/step), and fatigue-creep interaction (1200&#xa0;s/step) experiments were conducted under 0.4–0.9 times UCS at a loading rate of 0.5&#xa0;MPa/s. The experimental results are as follows: In the fatigue and fatigue-creep interaction experiments, the strain of the specimen was divided into the primary, steady-state, and tertiary stages. Comparing the fatigue and creep experiments, the error in the experimental results was approximately 5%, and the experimental time had been significantly reduced, demonstrating the equivalence between the both. The strain was decomposed into instantaneous, creep, and fatigue, with the time-dependent strain consisting of fatigue and creep. In the interaction experiments, the application of fatigue loading caused disturbances, leading to strain lag. The creep strain accounted for a larger proportion of the time-dependent strain, while the fatigue strain contributed less. However, the proportion of fatigue strain increased with the duration of fatigue loading. Moreover, the interaction between fatigue and creep increases the total strain of the rock. Finally, a fatigue-creep-damage model was established to reflect the primary, steady-state, and tertiary stages. The error between the model calculations and experimental results remains below approximately 4%, ensuring the accuracy of the model.</p>

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Time-Dependent Mechanical Properties of Red Sandstone Under Fatigue-Creep Interaction Loading

  • 期刊论文

  • 发表日期：

    2025年6月16日

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  • Bowen Yao,
  • Xiang Zhang,
  • Wendong Yang,
  • Bing Hou,
  • Zhicheng Gong

摘要

As energy extraction and space utilization extend deeper into the Earth, engineering rock is subjected to creep under in-situ stress and experiences fatigue due to cyclic loads such as vibrations and earthquakes. The time-dependent mechanical properties of rocks under complex loading conditions, such as fatigue and creep have not been fully clarified. In this study, fatigue (900 s/step), creep (3 d/step), and fatigue-creep interaction (1200 s/step) experiments were conducted under 0.4–0.9 times UCS at a loading rate of 0.5 MPa/s. The experimental results are as follows: In the fatigue and fatigue-creep interaction experiments, the strain of the specimen was divided into the primary, steady-state, and tertiary stages. Comparing the fatigue and creep experiments, the error in the experimental results was approximately 5%, and the experimental time had been significantly reduced, demonstrating the equivalence between the both. The strain was decomposed into instantaneous, creep, and fatigue, with the time-dependent strain consisting of fatigue and creep. In the interaction experiments, the application of fatigue loading caused disturbances, leading to strain lag. The creep strain accounted for a larger proportion of the time-dependent strain, while the fatigue strain contributed less. However, the proportion of fatigue strain increased with the duration of fatigue loading. Moreover, the interaction between fatigue and creep increases the total strain of the rock. Finally, a fatigue-creep-damage model was established to reflect the primary, steady-state, and tertiary stages. The error between the model calculations and experimental results remains below approximately 4%, ensuring the accuracy of the model.