实验研究介面俯冲角对结合石灰岩-煤样本变形失败的影响
Faxin Li1,2, Yisong Ding3, Zhen Zhang4
1Engineering Laboratory of Deep Mine Rockburst Disaster Assessment, Jinan, 250104, China.
Scientific reports
|November 4, 2023
概括
这项研究在单轴压缩下研究了石灰岩-煤样本,揭示了倾斜角度如何影响变形和失效. 较高的角度增加了煤样品失效和石灰岩反弹变形,影响了能量转化.
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:
- 了解石灰岩-煤炭等复合材料的机械行为对于采矿和土木工程至关重要.
- 不同倾角对这种异质材料的变形和故障机制的影响需要详细研究.
研究的目的:
- 分析不同倾斜角度 (0-60°) 对单轴压缩石灰岩-煤样本变形和故障特征的影响.
- 为了将变形演变与裂的开始,传播和接口滑动相关联.
- 在不同的倾斜角度下检查能量转换和声辐射特征.
主要方法:
- 单轴压缩实验在石灰岩煤样本上进行,倾斜角度为0°,15°,30°,45°和60°.
- 声波发射 (AE) 系统和三维延伸测试数字图像相关性 (DIC) 用于全场应变测量.
- 分析的重点是塑料产量,变形局部化,裂传播,接口行为和能量转化.
主要成果:
- 标本表现出塑料产量特征,其变化受到倾斜角度的影响.
- 变形局部化与煤炭和接口滑动中的裂纹启动/传播相关. 在15°,煤炭故障诱导了石灰岩反弹变形,随着角度的增加而增加.
- 在高峰前,弹性特性密度随着倾斜角度的增加而下降. 能量转化为导弹性能最初增加,然后减少.
- 声波发射能量速率显示出不同的时间模式 (安静,活跃,突然增加).
结论:
- 倾斜角显著影响石灰岩煤样本的变形和故障模式.
- 接口滑动和煤样机故障是影响整体复合材料行为和能量消耗的关键因素.
- 声辐射分析为在标本中发生的动态故障过程提供了宝贵的见解.
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