Full
Outline
In order to study the effect of heat treatment on the physical and mechanical properties and strength change mechanism of clay-rich sandstone, the clay-rich sandstone specimens were heat treated at 25 ℃, 200 ℃, 400 ℃, 600 ℃ and 800 ℃, respectively, and the physical parameter measurement test and uniaxial compression test were carried out on the specimens after heat treatment.The results show that with the increase of heat treatment temperature, the mass of sandstone specimens decreases continuously, the wave velocity and elastic modulus increase first and then decrease, the porosity and peak strain decrease first and then increase. The strength of the sandstone specimens shows strengthening characteristics at 25 -600 ℃ heat treatment temperature, and shows deterioration characteristics at 600 - 800 ℃ heat treatment temperature. Finally, the strength change mechanism of clay-rich sandstone is revealed from three aspects: particle thermal expansion, mineral dehydration, mineral phase change and thermal decomposition. The research results provide a reference for the study of the thermal characteristics of clay-rich sandstone, and lay a theoretical foundation for the repair and reinforcement of underground space rock engineering under high temperature.
97
39
| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
关闭全屏
No. 86 Xueyuan South Road, Haidian District, Beijing
010-62662699(Operation and Technical Support)
qkjq@cast.org.cn
Copyright © 2025 China Association for Science and Technology. All rights reserved. For all open access content, the relevant licensing terms apply.
Sponsored by the Office of the Leading Group for Cybersecurity and Informatization of CAST, and supported by Science and Technology Review Publishing House
