Scholarlink

<p>Understanding the shear mechanical behavior and degradation mechanisms of rock mass joint surfaces subjected to wetting‒drying cycles is crucial for the optimized treatment and early hazard warning in slope engineering. In this study, sandstone joint samples with identical surface morphologies were fabricated using 3D engraving technology. Shear tests were conducted on these samples after they were exposed to different numbers of wetting‒drying cycles. Coupled with real-time acoustic emission (AE) monitoring, this research systematically examines the degradation patterns and damage evolution mechanisms governing the shear mechanical behavior of joints under cyclic wetting–drying conditions. The results demonstrate that the shear mechanical parameters decrease progressively with increasing number of wetting‒drying cycles. After 5 to 15 wetting‒drying cycles, the peak shear strength of the sandstone joints decreased by 14.5% to 28.4%, accompanied by a transition in failure mode from predominantly brittle fracture to progressive frictional wear. AE monitoring further revealed a notable reduction in the proportion of high-energy brittle fracture events and a significant increase in low-energy frictional slip events under the influence of wetting‒drying cycles. Building upon the experimental data and the Barton shear strength criterion, a modified joint shear strength model that accounts for the degradation effect induced by wetting‒drying cycles is proposed. This model demonstrates reliable performance in accurately predicting the strength of sandstone joints subjected to such environmental conditions. These findings provide a theoretical foundation for assessing the long-term stability of jointed rock masses in open-pit mine slopes that are exposed to wetting–drying cycles.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Study on the Shear Behavior and Damage Mechanism of 3D Engraved Sandstone Joints Subjected to Wetting–Drying Cycles

  • 期刊论文

  • 发表日期：

    2026年3月13日

查看全文
  • Yujing Jiang,
  • Junxiao Han,
  • Changsheng Wang,
  • Hengjie Luan,
  • Sunhao Zhang,
  • Dong Wang,
  • Xinpeng Li,
  • Chao Zhang

摘要

Understanding the shear mechanical behavior and degradation mechanisms of rock mass joint surfaces subjected to wetting‒drying cycles is crucial for the optimized treatment and early hazard warning in slope engineering. In this study, sandstone joint samples with identical surface morphologies were fabricated using 3D engraving technology. Shear tests were conducted on these samples after they were exposed to different numbers of wetting‒drying cycles. Coupled with real-time acoustic emission (AE) monitoring, this research systematically examines the degradation patterns and damage evolution mechanisms governing the shear mechanical behavior of joints under cyclic wetting–drying conditions. The results demonstrate that the shear mechanical parameters decrease progressively with increasing number of wetting‒drying cycles. After 5 to 15 wetting‒drying cycles, the peak shear strength of the sandstone joints decreased by 14.5% to 28.4%, accompanied by a transition in failure mode from predominantly brittle fracture to progressive frictional wear. AE monitoring further revealed a notable reduction in the proportion of high-energy brittle fracture events and a significant increase in low-energy frictional slip events under the influence of wetting‒drying cycles. Building upon the experimental data and the Barton shear strength criterion, a modified joint shear strength model that accounts for the degradation effect induced by wetting‒drying cycles is proposed. This model demonstrates reliable performance in accurately predicting the strength of sandstone joints subjected to such environmental conditions. These findings provide a theoretical foundation for assessing the long-term stability of jointed rock masses in open-pit mine slopes that are exposed to wetting–drying cycles.