受到冷液冲击刺激的受损热干岩流网络的微观结构特征
Yong Sun1, Long Feng1, Cheng Zhai2
1School of Low Carbon Energy and Power Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China.
ACS omega
|January 20, 2025
概括
液冷冲击通过创建复杂的孔状网络,有效地折断热干岩 (HDR). 温度差异是关键,增强地热能源提取潜力.
科学领域:
- 地热能源工程 地热能源工程
- 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:
- 热干岩 (HDR) 地热能源的发展受到深层,低度水库中流体流量和热交换差的限制.
- 在HDR中刺激断裂网络对于高效的能量提取至关重要.
- 现有的方法在创造有效的透性方面面临着挑战.
研究的目的:
- 为了研究液循环冷冲击方法的有效性,用于破碎HDR储.
- 分析温度差异和周期性冲击对HDR中孔隙断裂网络发展的影响.
- 量化评估由冷冲击方法引起的孔隙结构变化和异质性.
主要方法:
- 将热干岩 (HDR) 样品在不同温度 (200-500°C) 的液冷冲击中进行5次循环.
- 使用低场核磁共振和X射线显微镜分析孔裂结构.
- 应用多分体分析来量化毛孔分布和异质性的变化.
主要成果:
- 液冲击显著改变了毛孔性,毛孔大小分布取决于温度 (小毛孔在200-300°C,大毛孔在400-500°C).
- 中间孔是最敏感的,其次是微孔和宏孔,表明对热应激有不同的反应.
- 多分形参数 (切片孔隙度,分形盒尺寸,概率) 显示呈指数增长,反映了异质性和孔隙度的增加.
结论:
- 温度差异是周期性冷震期间HDR中孔隙损伤的主要驱动因素.
- 循环液冲击促进了持续的孔隙发育,并提高了水库的透性.
- 多碎片分析提供了一种定量方法,用于在受损的HDR中描述复杂的孔裂结构.
相关概念视频
01:20Microcracking in Concrete
100
Microcracking in concrete refers to the tiny cracks that can form within the material even before any external load is applied. These microcracks typically occur at the interface between the coarse aggregate and the hydrated cement paste, often as a result of differential volume changes prompted by variations in stress-strain behavior, as well as thermal and moisture movement. Initially, these microcracks remain stable and do not grow substantially until the concrete is stressed to about 30...
100
01:27Frost Action on Concrete
89
Concrete structures in cold climates, such as those along roadsides, can retain moisture. This moisture makes them susceptible to frost-related damage when temperatures fall below freezing. Adding moisture worsens the damage during temperature fluctuations, leading to repeated freezing and thawing. De-icing salts, spread over these structures to melt ice, add to the freeze-thaw cycle, and draw even more moisture into the concrete.
This freeze-thaw cycle primarily causes surface scaling, where...
This freeze-thaw cycle primarily causes surface scaling, where...
89