Investigating Thermal Damage of Sandstone

DOI

10.2991/978-94-6463-900-1_13How to use a DOI?

Keywords

Sandstone; tensile strength; porosity; thermal damage model

Abstract

High temperatures can significantly alter the engineering properties of rocks, presenting one of the significant challenges in mining and geothermal energy development. Current thermal damage theories and constitutive models often overlook the effects of impurities and the development of microcracks in rocks at high temperatures. This study investigates the influence of high temperatures on the engineering properties of sandstone through a series of laboratory tests, with a focus on analyzing the roles of microstructural features, mineral impurities, and porosity. The experiments employed a high-porosity sandstone sample rich in impurities, subjected to heating under various temperature conditions, which induced different quantities and characteristics of microcracks. A series of Brazilian tensile strength tests were conducted on rock specimens to understand the effect of temperatures on rock strength. The obtained data showed significant changes in rock porosity with increasing temperatures. A discrete element analysis was performed to develop a constitutive model of rock damage, examining the impact of impurities and microcracks on rock strength. The results indicated that impurities and microcracks played a crucial role in high-temperature rock damage, particularly when temperatures exceeded 600 ℃, at which point the number and length of microcracks increased significantly. The formation of discontinuities was notably influenced by impurities, with the size and shape of these impurities having a significant effect on crack development. The combined effects of high temperatures and the physical properties of rocks led to substantial changes in their engineering properties.

Copyright

© 2025 The Author(s)

Open Access

Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

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TY  - CONF
AU  - Qianhao Tang
AU  - Ivan Gratchev
AU  - Stephen Akosah
AU  - Zeng Ding
PY  - 2025
DA  - 2025/12/07
TI  - Investigating Thermal Damage of Sandstone
BT  - Proceedings of the Rocscience International Conference 2025 (RIC 2025)
PB  - Atlantis Press
SP  - 131
EP  - 140
SN  - 2589-4943
UR  - https://doi.org/10.2991/978-94-6463-900-1_13
DO  - 10.2991/978-94-6463-900-1_13
ID  - Tang2025
ER  -