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Outline
In order to explore the effect of high temperature and water cooling on the dynamic compressive mechanical properties of porous sandstone, XRD and SEM tests were carried out on natural condition and high temperature-water cooled sandstone specimens at 200 ℃, 400 ℃, 600 ℃, 800 ℃ and 1000 ℃. The impact compression test was carried out by SHPB test device, and the high temperature-natural cooling condition was added as a comparison. The results show that the natural sandstone structure is dense, and the main mineral components are calcite, dolomite and quartz. After high temperature-water cooling treatment, calcite and dolomite are gradually decomposed into calcium oxide, calcium hydroxide is formed in water, and the section is covered with micron-sized particles. With the increase of the action temperature, the color of the specimens gradually changes from gray to brown, their volume expands, and their mass, density and longitudinal wave velocity decrease. The dynamic stress-strain curves of the specimens after different high temperature-water cooling treatments are similar, which are divided into three stages, including elasticity, plasticity and failure. The dynamic compressive strength is negatively correlated with the action temperature, and the dynamic strain and average strain rate are positively correlated with the action temperature. With the increase of the action temperature, the impact crushing degree of the specimens is aggravated, and the damage is changed from several fragments to powder. Compared with the high temperature-natural cooling porous sandstone specimens, the dynamic compressive strength and average particle size of the high temperature-water cooling porous sandstone specimens decrease, and the dynamic strain and average strain rate increase. The high temperature-water cooling effect causes the internal structure damage of the porous sandstone specimens. The higher the temperature, the more serious the structural damage of the specimens and the more obvious the dynamic characteristic decline.
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| 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 |
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