贝山花岩中温度依赖的三轴强度的微机制和对高水平放射性废物处理的含义
Wei Zeng1, Yun Wu2,3, Lihua Hu1,4
1State Key Laboratory of Intelligent Construction and Healthy Operation & Maintenance of Deep Underground Engineering, China University of Mining and Technology, Xuzhou, 221116, China.
Scientific reports
|October 31, 2025
概括
贝山花岩的强度最初增加,然后随着热量增加而下降,这是由于裂关闭和颗粒间裂. 较高的封闭压力减少了热损伤,这对于放射性废物处理库的设计至关重要.
科学领域:
- 地质技术工程 地质技术工程
- 材料科学 材料科学 材料科学
- 核工程 核工程是指核工程.
背景情况:
- 北山花岩是中国高水平放射性废物 (HLW) 处置的候选宿主岩石.
- 热力学合条件显著影响花岩的长期稳定性.
- 了解花岩机械性能的热变化对于仓库安全至关重要.
研究的目的:
- 为了研究贝山花岩在热负荷和三轴应力下的强度和故障行为.
- 为了确定花岩强度降解的临界温度值.
- 评估限制压力对抑制热损伤的影响.
主要方法:
- 贝山花岩的样本被加热到各种温度 (25-600°C) 并冷却.
- 三轴压缩试验是在限制压力 (5,15,25 MPa) 下进行的.
- 使用声波排放监测来追踪裂的传播.
主要成果:
- 三轴压缩强度 (TCS) 显示了与温度的非单调变化.
- 在300°C以下,由于裂关闭和蒸发效应,TCS增加.
- 在400°C以上,TCS平均下降14.27%,原因是颗粒间裂.
- 裂纹传播从微裂纹转向400°C以上的宏裂纹.
- 强度降解率随着限制压力的增加而降低.
结论:
- 对于北山花岩的强度降解,存在一个临界温度值.
- 较高的限制压力有效地抑制了热损伤,这表明了深度补偿原则.
- 这些发现为HLW存储库工程提供了基本的热力学设计标准.
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