Full
Outline
Aiming at the strength optimization problem of filling body in the newly delineated recoverable area of the security pillar of a gold mine, the determination and verification of the strength parameters of the filling body were systematically carried out. In view of the limitations of the traditional single method, a variety of analytical methods such as empirical formula calculation, elastic-plastic mechanics theory analysis and FLAC3D numerical simulation were innovatively used to focus on the regulation mechanism of different strength filling bodies on stope stability and rock strata movement. Finally, the optimal filling scheme considering both safety and economy was constructed. The results show that the reasonable maximum strength of filling body is in the range of 0.72−1.99 MPa through empirical formula and theoretical calculation. The improvement of the strength of the filling body can effectively control the horizontal deformation of the wellbore and the displacement of the rock strata around the stope. When the filling body strength of the upper upward drift filling mining method and the deep shallow-hole shrinkage subsequent filling mining method is set as 2.0 MPa, it can not only effectively control the rock strata movement in the mining area and ensure the stability of the stope, but also take into account the economic cost and achieve the balance between safety and economy.
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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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