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To investigate the effect of chemical solution corrosion on the dynamic impact compression mechanical properties of sandstone, red sandstone accelerated by distilled water and HCl solution with pH of 5 and 3 were used as the research objects. Dynamic compression tests were conducted under five different impact pressures to explore the influence of chemical solution corrosion on the dynamic mechanical parameters, crushing energy consumption, and failure mode of sandstone. The corrosion process and degradation mechanism of sandstone by chemical solutions were revealed using XRD and SEM, and the variation of micro fractal dimension before and after chemical solution corrosion was quantitatively characterized by box-counting method. The results indicate that in acidic environments, muscovite and plagioclase in sandstone will transform into quartz and soft kaolinite, and the cement will be dissolved. The contact mode among particles will change, resulting in an increase in the fractal dimension and damage rate of sandstone microstructure with the increase of solution acidity. Under the action of acidic solution, the stiffness of mineral particles decreases, the structure is loose, and the mechanical properties deteriorate. Taking the strain rate of 58.06 s-1 as an example, as the acidity of the solution increases, the peak dynamic stress decreases by 17.27%, 39.83% and 49.63%, respectively, and the dynamic peak strain increases by 13.04%, 31.30% and 38.26%, respectively. After corrosion, the macroscopic fragmentation of sandstone intensifies, the energy consumption ratio decreases, the fractal dimension increases, and the failure mode changes from tension to shear. This research system reveals the mechanism of the influence of chemical corrosion on the dynamic mechanical behavior of sandstone, providing a reference for the stability assessment of rock engineering in acidic environments.
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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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