Scholarlink

<p>After a high dam reservoir is impounded, the water pressure environment of the dam foundation and reservoir bank rock mass changes, potentially inducing bank slope instability, dam collapse, and other engineering problems. To explore the effects and failure mechanisms of different constant water pressures on fractured rock masses in dam foundations, triaxial compression tests were conducted on saturated sandstone with initial damage under different constant pore water pressures. Meanwhile, the fracture mechanics and acoustic emission characteristics were analyzed using CT scans and acoustic emission techniques. This paper examines the stress-strain behavior, volume expansion characteristics, peak strength variations, fracture surface morphology, and quantitative damage assessment of sandstone. Additionally, it analyzes the distribution characteristics of acoustic emission signals on the fracture surface. The experimental results demonstrate that: (1) Water pressure significantly influences the stress-strain behavior, peak strength, and volumetric expansion points of saturated damaged sandstone. (2) With increasing water pressure, the failure mode of saturated damaged sandstone transitions from an S-shaped single fracture surface to a Y-shaped multiple-fracture surface. All failure planes exhibit oblique cross-sectional failure. (3) When the water pressure reaches 6&#xa0;MPa, resulting in a 37.83% increase in bond failure. Moreover, this study does not consider the effects of scale dependency or long-term water pressure. Future research should aim to expand the experimental scale and investigate long-term hydro-mechanical coupling to enhance the reliability and applicability of the findings.</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

Triaxial loading mechanical properties and differential failure mechanisms of damaged sandstone under pore water pressure changes

  • 期刊论文

  • 发表日期：

    2025年6月5日

查看全文
  • Xiang Fu,
  • Han Su,
  • Qiang Xie,
  • Kuang Dong,
  • Hao Mei,
  • Yuxin Ban

摘要

After a high dam reservoir is impounded, the water pressure environment of the dam foundation and reservoir bank rock mass changes, potentially inducing bank slope instability, dam collapse, and other engineering problems. To explore the effects and failure mechanisms of different constant water pressures on fractured rock masses in dam foundations, triaxial compression tests were conducted on saturated sandstone with initial damage under different constant pore water pressures. Meanwhile, the fracture mechanics and acoustic emission characteristics were analyzed using CT scans and acoustic emission techniques. This paper examines the stress-strain behavior, volume expansion characteristics, peak strength variations, fracture surface morphology, and quantitative damage assessment of sandstone. Additionally, it analyzes the distribution characteristics of acoustic emission signals on the fracture surface. The experimental results demonstrate that: (1) Water pressure significantly influences the stress-strain behavior, peak strength, and volumetric expansion points of saturated damaged sandstone. (2) With increasing water pressure, the failure mode of saturated damaged sandstone transitions from an S-shaped single fracture surface to a Y-shaped multiple-fracture surface. All failure planes exhibit oblique cross-sectional failure. (3) When the water pressure reaches 6 MPa, resulting in a 37.83% increase in bond failure. Moreover, this study does not consider the effects of scale dependency or long-term water pressure. Future research should aim to expand the experimental scale and investigate long-term hydro-mechanical coupling to enhance the reliability and applicability of the findings.