实验和数值模拟研究的机械性能和缺陷特征的岩石质量与薄弱的中间层
Feng Wang1, Yong Yang1, Yuchi Wang1
1Open-pit Mining Branch of Ansteel Mining Gongchangling Co., Ltd., Liaoyang, Liaoning, China.
PloS one
|August 7, 2025
概括
这项研究研究了具有薄弱间层的岩石状材料,发现间层厚度和倾斜度增加会降低强度和刚度. 故障始于弱层间层,从拉力转换为剪切模式.
科学领域:
- 地质技术工程 地质技术工程
- 岩石机械学 岩石机械学
- 材料科学 材料科学 材料科学
背景情况:
- 了解具有不连续性的岩石质量的机械行为对于土木工程项目至关重要.
- 薄弱的中间层显著影响岩石类材料的整体强度和故障机制.
- 之前的研究已经探讨了岩石破裂的各个方面,但层间倾斜和厚度的综合影响需要进一步的详细调查.
研究的目的:
- 阐明含有弱间层的岩石类材料的机械性能和故障行为.
- 研究层间倾斜度和厚度对宏观断裂和声辐射特征的影响.
- 分析裂纹的发起,传播,应力分布和能量演变,从中观视角来看.
主要方法:
- 单轴压缩测试是在具有不同倾斜度和厚度的薄弱中间层的岩石类材料上进行的.
- 分析了声波发射环数和宏观骨折模式.
- 中视镜分析包括裂的发起和传播,应力场的分布和能量演变.
- 实验失效模式与数值模拟进行了比较.
主要成果:
- 峰强度和弹性模量随着层间厚度和倾斜度的增加而下降.
- 间层厚度使得峰值强度降低了38.27%,弹性模量降低了68.69%.
- 层间倾斜减少了51.28%的峰值强度和8.47%的弹性模量.
- 能量消散集中在高峰后阶段,与微裂凝聚相关.
- 最初的故障发生在弱的中间层或接口上,压力集中在相邻的侧面.
- 故障模式从拉力转变为剪切,导致联合拉力剪切故障和整体样本故障.
结论:
- 薄弱的间层厚度和倾斜度是控制岩石类材料机械性能和故障模式的关键因素.
- 薄弱的中间层作为微裂纹启动的关键区域,并影响应力分布.
- 该研究提供了对复杂的故障机制的洞察,这对于岩石工程设计和稳定性分析至关重要.
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