Scholarlink

<p>Increasing global warming has amplified high-altitude geohazards associated with rock joints containing ice-rich debris infill (RJID), threatening high-altitude infrastructure. Through cryogenic direct shear tests with acoustic emission (AE) monitoring, this study investigates how the filling ratio (<i>t/a</i>: infill thickness to asperity height), ice content (<i>V</i><sub>ice</sub>), and temperature (<i>T</i>) govern RJID shear behavior. Three distinct failure modes are identified: elastic–fluctuating–plastic (EFP) in unfilled joints transitions to elastic–brittle–plastic (EBP) or elastic–softening–plastic (ESP) in ice-rich conditions, with EBP dominating at high <i>V</i><sub>ice</sub> (≥ 65%) or low <i>T</i> (≤ − 3&#xa0;°C). A critical <i>t/a</i> threshold (0.5–1.0) exists where shear strength drops by &gt; 50% as failure shifts from rock-infill composite to pure infill-dominated behavior. This study quantifies unprecedented thermal sensitivity (<i>τ</i><sub>p</sub> decreases by 138.8&#xa0;kPa/°C) and ice content effects (47% strength reduction at <i>t/a</i> = 3 when <i>V</i><sub>ice</sub> increases from 40 to 90%). AE signals correlate with damage mechanisms, exhibiting delayed maxima and reduced amplitudes at high <i>t/a</i>. An enhanced Mohr–Coulomb criterion, incorporating <i>T</i>- and <i>V</i><sub>ice</sub>—dependent cohesion/friction angles, was developed via bivariate regression. A refined disturbed state concept (DSC) constitutive model was developed to capture the deformation process.</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

Experimental Study on the Shear Behavior and Acoustic Emissions of Rock Joints Containing Ice-Rich Debris Infill

  • 期刊论文

  • 发表日期：

    2025年10月22日

查看全文
  • Qiujie Meng,
  • Da Huang,
  • Yixiang Song

摘要

Increasing global warming has amplified high-altitude geohazards associated with rock joints containing ice-rich debris infill (RJID), threatening high-altitude infrastructure. Through cryogenic direct shear tests with acoustic emission (AE) monitoring, this study investigates how the filling ratio (t/a: infill thickness to asperity height), ice content (Vice), and temperature (T) govern RJID shear behavior. Three distinct failure modes are identified: elastic–fluctuating–plastic (EFP) in unfilled joints transitions to elastic–brittle–plastic (EBP) or elastic–softening–plastic (ESP) in ice-rich conditions, with EBP dominating at high Vice (≥ 65%) or low T (≤ − 3 °C). A critical t/a threshold (0.5–1.0) exists where shear strength drops by > 50% as failure shifts from rock-infill composite to pure infill-dominated behavior. This study quantifies unprecedented thermal sensitivity (τp decreases by 138.8 kPa/°C) and ice content effects (47% strength reduction at t/a = 3 when Vice increases from 40 to 90%). AE signals correlate with damage mechanisms, exhibiting delayed maxima and reduced amplitudes at high t/a. An enhanced Mohr–Coulomb criterion, incorporating T- and Vice—dependent cohesion/friction angles, was developed via bivariate regression. A refined disturbed state concept (DSC) constitutive model was developed to capture the deformation process.