Scholarlink

<p>Thermal-induced metamorphism of coral reef limestone (CRL) leads to the deterioration of its engineering properties, causing a threat to the safety of reef caverns. The physical, mechanical, and fracture characteristics of CRL at high temperatures were studied in this paper utilizing the acoustic emission (AE) technology. The results reveal that 400&#xa0;°C is the threshold temperature for thermal damage to CRL. The porosity significantly increases after temperatures exceed 400 °C, indicating the development of thermal-induced cracks within the rock. Thermal-induced cracks and mineral decomposition severely degrade the strength and elastic modulus of CRL. The frequency distribution of AE waveforms represents the transition of failure mode from tensile–shear composite failure to shear failure as the temperature evolves. The increase of the <i>b </i>value with rising temperature indicates a transition in the crack pattern from large-sized crack dominance to small-crack network dominance. The results of this study fill a research gap concerning thermal damage in CRL. The key findings provide theoretical guidance for the design and construction of underground chambers in islands and reefs.</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

Investigation of the Mechanical Behavior Evolution and Cracking Characteristics of Coral Reef Limestone Subjected to High Temperature Utilizing the AE Technique

  • 期刊论文

  • 发表日期：

    2025年1月26日

查看全文
  • Chi Wang,
  • Qingshan Meng,
  • Kai Wu,
  • Tianli Shen

摘要

Thermal-induced metamorphism of coral reef limestone (CRL) leads to the deterioration of its engineering properties, causing a threat to the safety of reef caverns. The physical, mechanical, and fracture characteristics of CRL at high temperatures were studied in this paper utilizing the acoustic emission (AE) technology. The results reveal that 400 °C is the threshold temperature for thermal damage to CRL. The porosity significantly increases after temperatures exceed 400 °C, indicating the development of thermal-induced cracks within the rock. Thermal-induced cracks and mineral decomposition severely degrade the strength and elastic modulus of CRL. The frequency distribution of AE waveforms represents the transition of failure mode from tensile–shear composite failure to shear failure as the temperature evolves. The increase of the b value with rising temperature indicates a transition in the crack pattern from large-sized crack dominance to small-crack network dominance. The results of this study fill a research gap concerning thermal damage in CRL. The key findings provide theoretical guidance for the design and construction of underground chambers in islands and reefs.