Effect of wet-dry cycling on the pore characteristics of red sandstone after heat treatment

被引:2
|
作者
Wang, Ziyu [1 ,2 ]
Sun, Qiang [1 ,2 ,3 ]
Wang, Nianqin [1 ]
机构
[1] Xian Univ Sci & Technol, Coll Geol & Environm, Xian 710054, Shaanxi, Peoples R China
[2] Xian Univ Sci & Technol, Geol Res Inst Coal Green Min, Xian 710054, Peoples R China
[3] Shaanxi Prov Key Lab Geol Support Coal Green Explo, Xian 710054, Peoples R China
基金
中国国家自然科学基金;
关键词
High temperature; Sandstone; Dry and wet cycling; NMR; Porosity; MECHANICAL-PROPERTIES; FRACTURE-TOUGHNESS; STRENGTH; CYCLES; WATER; ROCK; BEHAVIOR; FAILURE; MODE; SALT;
D O I
10.1007/s10064-023-03528-2
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
This study investigates the influence of thermal conditions and wet-dry cycling on the pore characteristics of red sandstone, utilizing nuclear magnetic resonance spectrometry for analysis. The red sandstone samples were subjected to elevated temperatures followed by a series of wet-dry cycles. Our findings reveal a significant alteration in the porous architecture of the sandstone samples post-thermal treatment, primarily attributed to water evaporation and mineral expansion. Particularly, after 40 cycles of wetting and drying, the total porosity of the samples increased, most notably when subjected to a temperature of 800 degree celsius, where an 88.9% increase in total porosity was observed. Furthermore, as the number of cycles increased, the internal pore connectivity improved due to water-induced effects. The volume of micropores (r < 0.1 mu m) showed a decreasing trend, while mesopores (0.1 mu m < r < 1 mu m) remained relatively constant, and the volume of macropores (r > 1 mu m) increased under the same thermal conditions. These results have important implications for rock stability monitoring and engineering protection, as they demonstrate that wet-dry cycles can significantly exacerbate the degradation of the material properties of red sandstone by increasing its effective pore volume.
引用
收藏
页数:12
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