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Outline
In the process of open-pit mine production, mining disturbance can cause different degrees of damage to different areas of surrounding rock, and ultimately lead to changes in the mechanical properties of surrounding rock. In order to explore the influence of different initial damage levels on the mechanical properties and acoustic emission characteristics of sandstone, the characteristic stress value of sandstone was determined by analyzing the acoustic emission impact parameters during the loading process of sandstone samples, and the uniaxial compression test of sandstone with four different initial damage levels was carried out with acoustic emission monitoring system. The results show that the initial damage has a significant effect on the mechanical properties of the rock. With the increase of the initial damage degree, the compressive strength of the rock sample decreases by 33.6%, the elastic modulus decreases by 43.4%, the Poisson's ratio decreases by 64%, and the peak strain point gradually moves backward. The acoustic emission characteristic signals of sandstone with different initial damage levels are in good agreement with the stress-strain curves. With the increase of initial damage level, the sudden increase of local acoustic emission signals is obvious. With the increase of damage level, the crack failure mode of rock changed from tensile failure of non-destructive rock samples to tensile-shear mixed failure.
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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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