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Outline
Aiming at the problems of difficult mining, low mechanization and limited resource utilization of gently inclined thin ore body in a fluorite mine in Guizhou, combined with the occurrence characteristics and mining technical conditions of the ore body, it was recommended to adopt mechanized upward horizontal layered filling mining method. According to the structural parameters of the stope and the extraction technology, the stability of the stope was analyzed using Mathews stability graph method and numerical simulation software. The results show that the stope span, the exposed area of the hanging wall and the roof are less than the theoretical limit. The roof settlement of stope is between 0.96 − 4.32 mm. The maximum floor heave value of the bottom is 3.5 mm. The maximum compressive stress of the mining room is 9.8 MPa. The tensile stress value is far less than the tensile strength of the filling body 0.44 MPa. The plastic zone does not form penetration and the stope is always stable. After field application, the production capacity of the ore block is 150 t/d, the mining-cut ratio is 12.96 m/kt, the loss rate is 10%, and the dilution rate is 8%, which has achieved good economic benefits.
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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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