Scholarlink

<p>Grottoes rock in northern and southern China exhibit distinct failure modes, which is perhaps attributed to different rock microstructures. To elucidate the controlling mechanisms of microstructure on the grottoes’ failure mode, comparative studies were conducted on sandstones from seven grottoes. By uniaxial compression and ultrasonic wave tests, correlations between microstructure and crack critical stress were established. Critical crack stress has a strong negative correlation with grain size and a positive correlation with cementation, whereas its correlation with mineral content is weaker relatively. Grain size and cementation almost determine crack initiation and propagation. Due to the large grain size and low cementation of the grottoes sandstone in northern region, the macro failure exhibits an instantaneous failure pattern. In contrast, for grottoes sandstone in southern region, smaller grains and higher cementation results in a progressive failure pattern. Accordingly, conservation programs for different grottoes in northern and southern China have been proposed.</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

Differences in the failure process of grottoes sandstone in southern and northern China determined by microstructure

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年5月19日

查看全文
  • Shijie Liu,
  • Hengxing Lan,
  • Haoyang Chen,
  • Xiaolei Huang,
  • Langping Li,
  • Bao Han

摘要

Grottoes rock in northern and southern China exhibit distinct failure modes, which is perhaps attributed to different rock microstructures. To elucidate the controlling mechanisms of microstructure on the grottoes’ failure mode, comparative studies were conducted on sandstones from seven grottoes. By uniaxial compression and ultrasonic wave tests, correlations between microstructure and crack critical stress were established. Critical crack stress has a strong negative correlation with grain size and a positive correlation with cementation, whereas its correlation with mineral content is weaker relatively. Grain size and cementation almost determine crack initiation and propagation. Due to the large grain size and low cementation of the grottoes sandstone in northern region, the macro failure exhibits an instantaneous failure pattern. In contrast, for grottoes sandstone in southern region, smaller grains and higher cementation results in a progressive failure pattern. Accordingly, conservation programs for different grottoes in northern and southern China have been proposed.