Full
Outline
The security of shaft safety pillar is an important guarantee for safe mining in mines. The ground pressure activities in the mining area around the safety pillar of a gold mine were investigated and analyzed. Combined with the main risk factors, a security evaluation model considering multiple influencing factors was proposed, and the current safety evaluation of the mining area around the shaft safety pillar was evaluated. The research shows that the shallow ground pressure activity is caused by the combined action of geological factors and mining disturbance. The deep local deformation and failure are caused by the comprehensive influences of mining depth, in-situ stress increase and geological factors. The security of the safety pillar is affected by three types of factors, such as natural conditions, mining disturbance and production management, involving 11 influencing factors. The security evaluation of 41 stopes show that the safety level of most stopes is grade II, and the overall safety situation is good. The occurrence conditions of ore bodies, geological structure, mining methods and position of shaft safety pillars are the main factors affecting the security of pillars. In addition, stoping areas farther away from the shaft safety pillars exert less mining disturbance on the shaft zone, resulting in higher security of the safety pillars.
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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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