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Effect of high temperature on pore characteristics, yield stress, and deformation property of sandstone
https://orcid.org/0000-0002-0999-4019
Abstract High temperature can change rock structure and mechanical properties, which may cause potential hazards in rock engineering. In this paper, mercury intrusion porosimetry (MIP), uniaxial compression tests, P-wave velocity, and acoustic emission (AE) tests were implemented to study sandstone samples subjected to high temperatures. Results including the pore characteristic change, yield strength, and deformation of the sandstones after the high-temperature treatment were analyzed. The internal cause of the changes was revealed from the evolution of the microstructure obtained by the scanning electron microscope (SEM) test. The research results show a consistent critical temperature threshold in the changing process of pore characteristics, yield strength, and deformation characteristics of the sandstones, which is around 400 °C. When the heating temperature exceeds the threshold, the porosity of sandstone increases rapidly, the uniformity coefficient of pores increases sharply, the yield strength decreases rapidly, and the maximum displacement in the compaction stage increases significantly. Also, the number of big pores and the volume of pores with a diameter between 7 and 3000 nm were seen increasing. The above changes are mainly caused by the emergence of new cracks and the accelerated development of premier and new cracks in the microstructure of the sandstones, and the high temperature mainly affects pores with a diameter between 7 and 3000 nm. Although the yield strength decreases when the temperature goes beyond 400 °C, the ratio of the yield strength to the ultimate compressive strength remains nearly unchanged.
Effect of high temperature on pore characteristics, yield stress, and deformation property of sandstone
https://orcid.org/0000-0002-0999-4019
Abstract High temperature can change rock structure and mechanical properties, which may cause potential hazards in rock engineering. In this paper, mercury intrusion porosimetry (MIP), uniaxial compression tests, P-wave velocity, and acoustic emission (AE) tests were implemented to study sandstone samples subjected to high temperatures. Results including the pore characteristic change, yield strength, and deformation of the sandstones after the high-temperature treatment were analyzed. The internal cause of the changes was revealed from the evolution of the microstructure obtained by the scanning electron microscope (SEM) test. The research results show a consistent critical temperature threshold in the changing process of pore characteristics, yield strength, and deformation characteristics of the sandstones, which is around 400 °C. When the heating temperature exceeds the threshold, the porosity of sandstone increases rapidly, the uniformity coefficient of pores increases sharply, the yield strength decreases rapidly, and the maximum displacement in the compaction stage increases significantly. Also, the number of big pores and the volume of pores with a diameter between 7 and 3000 nm were seen increasing. The above changes are mainly caused by the emergence of new cracks and the accelerated development of premier and new cracks in the microstructure of the sandstones, and the high temperature mainly affects pores with a diameter between 7 and 3000 nm. Although the yield strength decreases when the temperature goes beyond 400 °C, the ratio of the yield strength to the ultimate compressive strength remains nearly unchanged.
Effect of high temperature on pore characteristics, yield stress, and deformation property of sandstone
https://orcid.org/0000-0002-0999-4019
Abstract High temperature can change rock structure and mechanical properties, which may cause potential hazards in rock engineering. In this paper, mercury intrusion porosimetry (MIP), uniaxial compression tests, P-wave velocity, and acoustic emission (AE) tests were implemented to study sandstone samples subjected to high temperatures. Results including the pore characteristic change, yield strength, and deformation of the sandstones after the high-temperature treatment were analyzed. The internal cause of the changes was revealed from the evolution of the microstructure obtained by the scanning electron microscope (SEM) test. The research results show a consistent critical temperature threshold in the changing process of pore characteristics, yield strength, and deformation characteristics of the sandstones, which is around 400 °C. When the heating temperature exceeds the threshold, the porosity of sandstone increases rapidly, the uniformity coefficient of pores increases sharply, the yield strength decreases rapidly, and the maximum displacement in the compaction stage increases significantly. Also, the number of big pores and the volume of pores with a diameter between 7 and 3000 nm were seen increasing. The above changes are mainly caused by the emergence of new cracks and the accelerated development of premier and new cracks in the microstructure of the sandstones, and the high temperature mainly affects pores with a diameter between 7 and 3000 nm. Although the yield strength decreases when the temperature goes beyond 400 °C, the ratio of the yield strength to the ultimate compressive strength remains nearly unchanged.
Effect of high temperature on pore characteristics, yield stress, and deformation property of sandstone
Zhang, Weiqiang (author) / Wang, Zuoquan (author) / Du, Yi (author) / Zhang, Shaoteng (author) / Shi, Zhoujian (author) / Li, Fanjia (author)
2021
Article (Journal)
Electronic Resource
English
BKL:
56.00$jBauwesen: Allgemeines
/
38.58
Geomechanik
/
38.58$jGeomechanik
/
56.20
Ingenieurgeologie, Bodenmechanik
/
56.00
Bauwesen: Allgemeines
/
56.20$jIngenieurgeologie$jBodenmechanik
RVK:
ELIB18
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