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Outline
To study the phenomenon of rock burst in deep rock roadway, the true triaxial rock burst test machine was used to study the phenomenon of rock burst induced by cyclic dynamic disturbance under different axial stresses in semi-circular arch roadway with prefabricated straight wall, and the acoustic emission technology was used to monitor the failure process of roadway. Through the rock burst test, it is found that the greater the initial axial static stress, the higher the degree of rock deterioration, the shorter the disturbance time required for rock burst, the faster the cumulative energy rate of the sample, and the more severe the rock burst. The results show that when the axial stress exceeds 76.5% of the peak stress of the rock roadway, the rock burst will occur after the cyclic dynamic disturbance is applied to the specimen. The failure mode of rock roadway is tension-shear combined failure, and the failure mode of crack propagation is closely related to axial stress and dynamic disturbance. Acoustic emission cumulative ringing count is used to describe the degree of rock deterioration, and it is found that the degree of rock deterioration under dynamic disturbance is positively correlated with the initial axial static stress.
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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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