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Outline
Roadway stability is the foundation of safe production in underground mines, and it is of great significance to study the dynamic damage effects of blasting vibration wave on roadway stability in underground mines. Taking the first subsection of a mine as the research object, aiming at the roof fall accident caused by the blasting vibration at the intersection of the footwall roadway and the approach due to the mining of the ore body during the mining process of the ore body of the non-pillar sublevel caving method, the FLAC3D dynamic analysis module was used to determine the reasonable position of the footwall roadway of the non-pillar sublevel caving method under the blasting load. The results show that the height of the section of the mine is 15 m, considering the vibration velocity, displacement and stress response of the roadway particles, the safe distance between the footwall connection roadway and the withdrawal position is 12 m. The engineering practice shows that the safety distance obtained by the study is obsolute deviation of only 0.7 m (<6%) with the reasonable safety distance of the footwall connection roadway in the mine site, which can provide solutions and technical support for the solution of similar problems in the mines.
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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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