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In the process of mineral exploitation, rock mass often bears different degrees of dynamic load. A series of dynamic impact and uniaxial compression tests were conducted to analyze the characteristic stress and acoustic emission characteristic parameters of sandstone after impact. The influence of dynamic disturbance damage on the mechanical behavior and acoustic emission response characteristics of sandstone specimens was studied. The results show that with the increase of impact velocity, the longitudinal wave velocity of sandstone specimens after impact test decreases gradually, while the internal damage variable increases gradually. With the increase of impact velocity, the ratio of crack closure stress to peak stress of sandstone specimens increases gradually, while the ratio of crack initiation stress to peak stress and the ratio of damage stress to peak stress decrease gradually. In the process of rock deformation and failure, acoustic emission activity shows significant stage evolution characteristics, and its activity intensity and frequency characteristics will change significantly with the damage evolution inside the rock. The research results can provide theoretical basis for the stability evaluation and support design of roadway surrounding rock under blasting disturbance.
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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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