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Erschienen in: Bulletin of Engineering Geology and the Environment 3/2024

01.03.2024 | Original Paper

Micro-damage evolution and macro-degradation of red sandstone under thermal and chemical erosion conditions

verfasst von: Wei Zeng, Zhen Huang, Xiaozhao Li, Lihua Hu, Shijie Li, Qixiong Gu, Yun Wu

Erschienen in: Bulletin of Engineering Geology and the Environment | Ausgabe 3/2024

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Abstract

Understanding the variations of the physical-mechanical properties of the surrounding rock in coupled thermal and acidic groundwater erosion environment, from the perspective of its micro-structure, is crucial for ensuring the safety and long-term sustainability of rock engineering (e.g., tunnels, slopes, shafts). In this study, the relationship between the mechanical behavior and microstructure evolutions of red sandstone from the southern part of Jiangxi Province, China, under thermal and chemical erosion treatments is experimentally investigated. The results show that the micro-structure of red sandstone is dominated by micropores, accounting for about 60% when the heating temperature is lower than 700 °C. 700-800 °C is the temperature range in which the internal pore structure of red sandstone is remarkably changed, and the proportion of macropores, mesopores, and cracks grows gradually, whereas the proportion of micropores shows a declining trend. Both tensile strength and P-wave velocity show a significant decrease subjected to high temperatures beyond 700 °C and acid solution erosion. The internal microstructure of red sandstone shows a large number of trans-granular cracks due to thermal stress and mineral reaction, while the erosion by acid solution causes a large increase of secondary pores. In addition, the micro-structural changes were further elaborated by the variations of mineral element (Si and O) content tested by the Energy Dispersive Spectrometer (EDS). To sum up, the fundamental mechanism governing the degradation of macroscopic physical properties and tensile strength involves mineral phase transitions and ion exchanges induced by the combined effects of temperature and acid solution erosion, leading to the damage of the microstructure and the development of cracks.

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Metadaten
Titel
Micro-damage evolution and macro-degradation of red sandstone under thermal and chemical erosion conditions
verfasst von
Wei Zeng
Zhen Huang
Xiaozhao Li
Lihua Hu
Shijie Li
Qixiong Gu
Yun Wu
Publikationsdatum
01.03.2024
Verlag
Springer Berlin Heidelberg
Erschienen in
Bulletin of Engineering Geology and the Environment / Ausgabe 3/2024
Print ISSN: 1435-9529
Elektronische ISSN: 1435-9537
DOI
https://doi.org/10.1007/s10064-024-03573-5

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