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Outline
Taking the mining area of Tongkeng Mine transition from caving method to filling method as the research object, the thickness of vertical isolation pillar and horizontal isolation pillar calculated by Bieniawski pillar strength formula and K. B. Rupeneyt theory should be less than 9.0 m and 9.36 m, respectively. A three-dimensional fine ore body mining model was established based on FLAC3D, and the influence of the entire mining process on stope stability under different thicknesses of isolation pillar was analyzed. The numerical simulation results show that, when the thickness of vertical isolation pillar is 10 m, the vertical displacement of the stope is less than 0.1 m, the maximum principal stress is 50 MPa, the minimum principal stress is 7.5 MPa, and the safety factor is greater than 8.0.When the thickness of vertical isolation pillar is 8 m, the displacement around the stope increases obviously, the plastic failure zone scope increases obviously, and the safety factor decreases slightly. Therefore, it is recommended that the thickness of the vertical isolated pillar in the mining area of the caving method to the filling method in Tongkeng Mine is 10 m.
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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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