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Evaluation of Thermophysical and Mechanical Properties of Sandstone Due to High-Temperature

Authors :
Zhen Dong
Yanpeng Chen
Xinggang Wang
Lingfeng Kong
Lianguo Wang
Xinning Li
Fenjin Sun
Ke Ding
Hanqi Wu
Shanshan Chen
Mengyuan Zhang
Source :
Materials, Vol 15, Iss 23, p 8692 (2022)
Publication Year :
2022
Publisher :
MDPI AG, 2022.

Abstract

In this study, thermophysical and mechanical tests were conducted on sandstone samples from room temperature to 1000 °C. Based on the test results, the thermophysical properties (such as specific heat capacity, thermal conductivity, and thermal expansion coefficient) of sandstone after high-temperature treatment and the variations of mechanical properties (including peak strength, peak strain, elastic modulus, and whole stress-strain curve) with temperature were analyzed. Indeed, the deterioration law of sandstone after high-temperature treatment was also explored with the aid of a scanning electron microscope (SEM). The results show that with the increase in temperature, the specific heat capacity and thermal expansion coefficient of sandstone samples after high-temperature treatment increase first and then decrease, while the thermal conductivity gradually decreases. The range from room temperature to 1000 °C witnesses the following changes: As temperature rises, the peak strength of sandstone rises initially and falls subsequently; the elastic modulus drops; the peak strain increases at an accelerated rate. Temperature change has a significant effect on the deterioration rules of sandstone, and the increase in temperature contributes to the transition in the failure mode of sandstone from brittle failure to ductile failure. The experimental study on the thermophysical and mechanical properties of sandstone under the action of high temperature and overburden pressure has a guiding significance for the site selection and safety evaluation of UCG projects.

Details

Language :
English
ISSN :
19961944
Volume :
15
Issue :
23
Database :
Directory of Open Access Journals
Journal :
Materials
Publication Type :
Academic Journal
Accession number :
edsdoj.3b094e8b95e4375b1944cf8fdc2f4ef
Document Type :
article
Full Text :
https://doi.org/10.3390/ma15238692