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<p>Weakly cemented sandstone (WCS) has a low degree of cementation, easy to disintegrate in contact with water, low strength and other special characteristics, so high-intensity mining is prone to weakly cemented peripheral rock roadway compared to other roadway deformation is greater, more likely to produce the phenomenon of roof, bottom dropsy and so on. To explore the effects of varying mining intensities on the degradation of WCS, uniaxial compression tests were conducted at six different loading rates, ranging from 0.01 to 1&#xa0;mm/min. The results show a positive correlation between the uniaxial compressive strength of the rock samples and the loading rate. However, the strength increased more rapidly in the 0.01–0.1&#xa0;mm/min range, and more slowly between 0.1 and 1&#xa0;mm/min. On the microscopic level, the damage pattern shifted from predominantly shear microfractures at lower rates to tensile microfractures at higher rates. A damage ontology model for WCS was developed, with the significance and values of the model parameters analyzed and calculated. Additionally, stress–strain curves for different loading rates were derived from the model. These findings provide valuable engineering insights for the construction of tunnels in weakly cemented rock formations.</p>

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Acoustic Emission and Damage Modelling of Weakly Cemented Sandstone under Varying Loading Rates

  • 期刊论文

  • 发表日期：

    2025年5月21日

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  • Jin Li,
  • Yongliang Li,
  • Xiang Zhang,
  • Shuai You,
  • Yuanyuan You,
  • Bo Wang

摘要

Weakly cemented sandstone (WCS) has a low degree of cementation, easy to disintegrate in contact with water, low strength and other special characteristics, so high-intensity mining is prone to weakly cemented peripheral rock roadway compared to other roadway deformation is greater, more likely to produce the phenomenon of roof, bottom dropsy and so on. To explore the effects of varying mining intensities on the degradation of WCS, uniaxial compression tests were conducted at six different loading rates, ranging from 0.01 to 1 mm/min. The results show a positive correlation between the uniaxial compressive strength of the rock samples and the loading rate. However, the strength increased more rapidly in the 0.01–0.1 mm/min range, and more slowly between 0.1 and 1 mm/min. On the microscopic level, the damage pattern shifted from predominantly shear microfractures at lower rates to tensile microfractures at higher rates. A damage ontology model for WCS was developed, with the significance and values of the model parameters analyzed and calculated. Additionally, stress–strain curves for different loading rates were derived from the model. These findings provide valuable engineering insights for the construction of tunnels in weakly cemented rock formations.