Scholarlink

<p>Structure rockburst is a typical brittle instability phenomenon in deep underground engineering, significantly affected by the inclination angle of the structural plane (<i>θ</i>) and the stress gradient coefficient (<i>k</i>) of the surrounding rock. To investigate its rupture characteristics under gradient loading, large-scale rock-like specimens containing through-going structural planes were prepared, with <i>θ</i> = 0°, 30°, 45°, 60°, and 90°. True triaxial gradient loading tests under single-face unloading were conducted with <i>k</i> = 0, 3, and 6. Infrared thermography and acoustic emission (AE) monitoring were employed to capture the progressive failure evolution. Results demonstrate that both <i>θ</i> and <i>k</i> significantly affect the failure mode and mechanical response. Under uniform stress, the loading time decreases with increasing <i>θ</i>, and structural planes with certain angles dominate the failure surfaces formation. With increasing <i>k</i>, specimens fail more rapidly, exhibiting intensified rockburst manifestations. As rockburst approaches, localized high-temperature zones in the infrared field become concentrated. Thermal indicators, including the interquartile range (<i>IQR</i>) and median absolute deviation (<i>MAD</i>), increase sharply. Simultaneously, the normalized cross-correlation coefficient (<i>NCC</i>) between adjacent thermal fields decreases significantly. AE responses show a decrease in cumulative ringing counts, accompanied by a sharp increase in peak ringing count. Overall, the sudden decrease in <i>NCC</i> and the spike in peak AE ringing counts serve as effective precursors to rockburst. The evolution and aggregation of high-temperature points, along with their increased proportion above critical thresholds, can delineate potential failure zones. These findings provide a basis for rockburst prediction and disaster mitigation in underground engineering.</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 Analysis of Structure Rockburst in Rock-Like Materials Under Gradient Loading Using Coupled Infrared Thermography and Acoustic Emission

  • 期刊论文

  • 发表日期：

    2026年1月5日

查看全文
  • Yuanhang Zhang,
  • Yuanyou Xia,
  • Manqing Lin,
  • Zhichao Wang,
  • Jian Huang,
  • Yaofeng Yan,
  • Wanquan Mei

摘要

Structure rockburst is a typical brittle instability phenomenon in deep underground engineering, significantly affected by the inclination angle of the structural plane (θ) and the stress gradient coefficient (k) of the surrounding rock. To investigate its rupture characteristics under gradient loading, large-scale rock-like specimens containing through-going structural planes were prepared, with θ = 0°, 30°, 45°, 60°, and 90°. True triaxial gradient loading tests under single-face unloading were conducted with k = 0, 3, and 6. Infrared thermography and acoustic emission (AE) monitoring were employed to capture the progressive failure evolution. Results demonstrate that both θ and k significantly affect the failure mode and mechanical response. Under uniform stress, the loading time decreases with increasing θ, and structural planes with certain angles dominate the failure surfaces formation. With increasing k, specimens fail more rapidly, exhibiting intensified rockburst manifestations. As rockburst approaches, localized high-temperature zones in the infrared field become concentrated. Thermal indicators, including the interquartile range (IQR) and median absolute deviation (MAD), increase sharply. Simultaneously, the normalized cross-correlation coefficient (NCC) between adjacent thermal fields decreases significantly. AE responses show a decrease in cumulative ringing counts, accompanied by a sharp increase in peak ringing count. Overall, the sudden decrease in NCC and the spike in peak AE ringing counts serve as effective precursors to rockburst. The evolution and aggregation of high-temperature points, along with their increased proportion above critical thresholds, can delineate potential failure zones. These findings provide a basis for rockburst prediction and disaster mitigation in underground engineering.