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Outline
To investigate the effects of hydrochemical and freeze-thaw (HFT) on the physical properties and shear mechanical characteristics of andesite, freeze-thaw tests were conducted for 45 cycles under three different hydrochemical environments. The andesite samples from the Duolong mining area in Tibet was selected as the research object. The changes in shear mechanical parameters and physical properties, as well as the damage mechanisms, were analyzed from both macroscopic and microscopic perspectives. The results show that, as the number of freeze-thaw cycles increases, both the physical properties and shear mechanical parameters of andesite in all three hydrochemical environments exhibit a deterioration trend, with the most significant damage observed in the acidic environment. The decrease in cohesion is more pronounced than that in the internal friction angle, and the failure modes differ among environments: shear failure in acidic environments, shear fracture failure in neutral environments, and tensile shear failure in alkaline environments. A shear mechanical prediction model based on shear test data was established, with an error of less than 10%, which can effectively predict the cohesion and internal friction angle values of the rock after long-term freeze-thaw cycles in different chemical environments. Quantitative analysis of damage caused by hydrochemical and freeze-thaw effects based on shear test parameters shows that freeze-thaw cycles cause more damage to andesite than hydrochemical effects.
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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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