在特定温度下研究岩石的机械性能,如预制孔的样本
Cheng Lu-Ping1, Xiong Zu-Qiang1, Ji Xue-Long1
1School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo, 454003, China.
Scientific reports
|November 28, 2025
概括
加热可膨胀聚乙烯 (EPS) 颗粒会在岩石样本中产生内部孔. 较大的孔和较高的孔隙性降低了峰值应力,增加了峰值应力,影响了裂演变和故障机制.
科学领域:
- 材料科学 材料科学 材料科学
- 地质技术工程 地质技术工程
- 计算力学 计算力学 计算力学
背景情况:
- 可扩展聚乙烯 (EPS) 颗粒在加热时会出现体积收缩,从而产生内部空洞.
- 具有内部空洞的岩石状材料需要对应力下的机械行为进行表征.
研究的目的:
- 调查预制孔径和孔径对含有加热EPS颗粒的岩石样本的机械性能和故障特性的影响.
- 使用粒子流软件模拟和分析这些样本中的裂纹演变.
主要方法:
- 加热EPS粒子以诱导体积收缩并创建内部空隙.
- 使用预制孔构建岩石样本.
- 进行单轴压缩试验.
- 使用粒子流代码 (PFC2D) 模拟故障过程.
主要成果:
- 孔隙形成效应在200°C时最明显,对样品强度的影响最小.
- 增加的孔径和孔隙性导致较低的峰值应力和较高的峰值应变,可能导致应变.
- 裂开始发生在孔隙位置,向外扩张,通过裂形成,拉力和剪切应力都会导致故障.
结论:
- 该研究量化了空隙特征对岩石类材料机械反应和故障模式的影响.
- 数字模拟 (PFC2D) 有效地捕捉了裂演变和样本失败的观察趋势.
- 失效是一个复杂的过程,涉及拉伸和剪切应力,而不仅仅是拉伸失效.
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