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<p>To study the acoustic emission characteristics of saturated red sandstone samples under triaxial compression after different numbers of freeze‒thaw cycles, triaxial compression tests were carried out on samples with different confining pressures using a triaxial testing system and an acoustic emission monitoring system. The relationship between the ringing count and stress over time was used to analyze: (1) the deformation and damage of sandstone after freeze‒thaw cycling, (2) the effects of the number of freeze‒thaw cycles and the magnitude of the confining pressure on the deformation and damage characteristics of the cumulative ringing count of sandstone samples. The cumulative ringing count coupled damage variable <i>D</i><sub><i>C</i></sub>, and stress <i>σ</i> under uniaxial compression were modeled using the Weibull distribution function and damage mechanics, and the representativeness of the model was verified by the experimental data. The results indicate the following: with the increase in the number of freeze‒thaw cycles, the sandstone porosity increases, the peak stress decreases, and the peak strain increases; with the increase in the confining pressure, the peak stress and peak strain of the sandstone increased. Sandstone freeze‒thaw damage is manifested as an initial damage stage, a stable damage stage, and an accelerated damage stage; under uniaxial compression, the cumulative ringing count increases with the number of freeze‒thaw cycles, then decreases and ultimately increases again; confining pressure promoted the closure of fissures (pores) and inhibits the development of fissures (pores), which leads to a decrease in the cumulative ringing count, and with an increasing number of freeze‒thaw cycles, this effect is more obvious.</p>

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Experimental Study on the Damage Characteristics of Sandstone Under Freeze‒Thaw Loading Coupling via the Acoustic Emission Method

  • 期刊论文

  • 发表日期：

    2025年4月23日

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  • Wanjun Ye,
  • Zhiyuan Xu,
  • Qianqian Ma,
  • Jiahao Wang,
  • Yuntao Wu

摘要

To study the acoustic emission characteristics of saturated red sandstone samples under triaxial compression after different numbers of freeze‒thaw cycles, triaxial compression tests were carried out on samples with different confining pressures using a triaxial testing system and an acoustic emission monitoring system. The relationship between the ringing count and stress over time was used to analyze: (1) the deformation and damage of sandstone after freeze‒thaw cycling, (2) the effects of the number of freeze‒thaw cycles and the magnitude of the confining pressure on the deformation and damage characteristics of the cumulative ringing count of sandstone samples. The cumulative ringing count coupled damage variable DC, and stress σ under uniaxial compression were modeled using the Weibull distribution function and damage mechanics, and the representativeness of the model was verified by the experimental data. The results indicate the following: with the increase in the number of freeze‒thaw cycles, the sandstone porosity increases, the peak stress decreases, and the peak strain increases; with the increase in the confining pressure, the peak stress and peak strain of the sandstone increased. Sandstone freeze‒thaw damage is manifested as an initial damage stage, a stable damage stage, and an accelerated damage stage; under uniaxial compression, the cumulative ringing count increases with the number of freeze‒thaw cycles, then decreases and ultimately increases again; confining pressure promoted the closure of fissures (pores) and inhibits the development of fissures (pores), which leads to a decrease in the cumulative ringing count, and with an increasing number of freeze‒thaw cycles, this effect is more obvious.