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<p>Long-term underground mining disturbances and surface precipitation intrusion readily trigger landslide disasters. As the overlying bedrock layer on slopes within the sandstone-shale stratigraphic system in southwest China, the long-term degradation of sandstone under coupled stress-water effects is the core factor controlling landslide evolution. Existing research primarily focuses on the creep behavior of sandstone under uniaxial and triaxial conditions, with limited studies on the creep characteristics of samples in ring shear tests and the long-term degradation patterns. This study prepared sandstone-like material samples with different moisture contents and investigated their creep behavior through ring shear creep tests. Microstructures of creep failure surfaces were analyzed using scanning electron microscopy (SEM) to elucidate the influence of moisture content on ring-shear creep characteristics and long-term strength. Creep constitutive models were selected to characterize the long-term degradation patterns of shear strength at different moisture contents. The conclusions are as follows: (1) For samples with different moisture content under graded loading conditions, the instantaneous creep deformation exhibits a significant increasing trend with rising stress levels. At moisture contents of 2% and 6%, the total deformation increases nearly linearly with rising stress levels. Conversely, at a moisture content of 10%, the total deformation first decreases and then increases with rising stress levels. (2) Based on the isochronous curve method, the long-term shear strengths of the samples at moisture contents of 2%, 6%, and 10% were determined to be 101.5&#xa0;kPa, 97.82&#xa0;kPa, and 69.28&#xa0;kPa, respectively. The corresponding long-term reduction factors were 11.97%, 13.83%, and 20%. (4) The Burgers model was selected to describe the constitutive relationship of the samples, with a goodness-of-fit exceeding 0.85. This indicates that the model effectively fits the creep test data of the samples and accurately reflects the long-term degradation patterns of sandstone-like materials. Research on the long-term degradation patterns of sandstone-like materials provides a theoretical basis for stability assessment in landslide-prone areas by revealing the coupling stress-water (creep-moisture content) mechanism.</p>

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Investigating long-term degradation patterns of sandstone-like materials using ring shear tests

  • 期刊论文

  • 发表日期：

    2025年11月27日

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  • Hongwei Bai,
  • Zhangyin Dai,
  • Ting Xia,
  • Yunqin Cao,
  • Wenfu Meng,
  • Qingli Luo

摘要

Long-term underground mining disturbances and surface precipitation intrusion readily trigger landslide disasters. As the overlying bedrock layer on slopes within the sandstone-shale stratigraphic system in southwest China, the long-term degradation of sandstone under coupled stress-water effects is the core factor controlling landslide evolution. Existing research primarily focuses on the creep behavior of sandstone under uniaxial and triaxial conditions, with limited studies on the creep characteristics of samples in ring shear tests and the long-term degradation patterns. This study prepared sandstone-like material samples with different moisture contents and investigated their creep behavior through ring shear creep tests. Microstructures of creep failure surfaces were analyzed using scanning electron microscopy (SEM) to elucidate the influence of moisture content on ring-shear creep characteristics and long-term strength. Creep constitutive models were selected to characterize the long-term degradation patterns of shear strength at different moisture contents. The conclusions are as follows: (1) For samples with different moisture content under graded loading conditions, the instantaneous creep deformation exhibits a significant increasing trend with rising stress levels. At moisture contents of 2% and 6%, the total deformation increases nearly linearly with rising stress levels. Conversely, at a moisture content of 10%, the total deformation first decreases and then increases with rising stress levels. (2) Based on the isochronous curve method, the long-term shear strengths of the samples at moisture contents of 2%, 6%, and 10% were determined to be 101.5 kPa, 97.82 kPa, and 69.28 kPa, respectively. The corresponding long-term reduction factors were 11.97%, 13.83%, and 20%. (4) The Burgers model was selected to describe the constitutive relationship of the samples, with a goodness-of-fit exceeding 0.85. This indicates that the model effectively fits the creep test data of the samples and accurately reflects the long-term degradation patterns of sandstone-like materials. Research on the long-term degradation patterns of sandstone-like materials provides a theoretical basis for stability assessment in landslide-prone areas by revealing the coupling stress-water (creep-moisture content) mechanism.