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The disturbance such as deep engineering blasting and excavation is prone to induce rock burst. To study the conditions and characteristics of rock burst induced by cyclic disturbance in deep tunnels under different stress conditions, granite specimens with semi-circular arches penetrating the tunnel were used to conduct true triaxial disturbance rockburst tests. The occurrence conditions, characteristics of rock burst in deep engineering, the evolution process of acoustic emission, and the energy evolution characteristics inside the rock were analyzed. The test results are concluded as follows. Firstly, when the disturbance amplitude exceeds 10 MPa, rock burst will occur in the specimen. For every additional 10 MPa of disturbance amplitude, the time from the start of disturbance loading to the occurrence of rock burst in the specimen is reduced by about 30%. The greater the disturbance amplitude, the more severe the damage to the specimen, and the more shear cracks on the rock surface. Secondly, cyclic disturbance significantly promotes the generation and extension of shear cracks. The disturbance not only increases the number of shear cracks but also accelerates the speed of crack propagation. Thirdly, the accumulated elastic strain energy inside the specimen increases with the increase of disturbance amplitude. When the specimen fails, these accumulated energies are rapidly released, leading to more severe failure of the specimen.
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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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