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Outline
To investigate the impact of acidic mine water erosion on the mechanical properties and microscopic failure mechanisms of limestone, the evolution of porosity, mechanical characteristics, and acoustic emission (AE) parameters (event rate, dominant frequency, energy rate, and crack type) across varying erosion durations (0, 14, 28, 42, and 56 days) was examined through uniaxial compression and AE tests. The results indicate that during the mine water erosion process, the porosity of the limestone increases from 0.26% in the intact state to 9.13% after 56 days of erosion. Uniaxial compression tests reveal that the peak strength, peak strain, and elastic modulus of the limestone progressively decrease with prolonged erosion time; specifically, the peak strength of the specimens eroded for 56 days decreases by 29.41% compared to the un-eroded counterparts. Furthermore, both the AE event rate and energy rate increase as erosion time extended. During the deformation and failure process, the number of low-dominant-frequency AE signals progressively multiplied, whereas the high-dominant-frequency AE signals exhibits a declining trend. Additionally, the proportion of shear microcracks demonstrates a gradual decrease, while the proportion of tensile microcracks correspondingly increases from 30.69% in the intact state to 57.92% after 56 days of erosion. Consequently, mine water erosion induces a progressive increase in porosity and exacerbates the propagation of microcracks and pores, thereby precipitating a substantial deterioration in mechanical performance. These findings provide robust theoretical support and technical guidance for the safe and efficient extraction of non-ferrous metal resources in water-rich 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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