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Outline
A lead-zinc mine adopts the sublevel rock-cutting stage room method to mine a sharply inclined medium-thickness ore body. On the basis of ensuring the stope stability, in order to further improve the benefits of mining, the Mathews stability diagram method was used to analyze the stope stability of the No.I ore body of the mine as the research object. By calculating the stability coefficient and hydraulic radius, the limit span of roof surrounding rock and side wall surrounding rock is 55.79 m and 44 m respectively, which shows that the current span of the mine of 50 m is reasonable. Combined with the calculation results, 9 schemes with different stage heights and roof thicknesses were formulated, and the numerical simulation studies on the stope stability under 9 schemes were carried out using FLAC3D to compare and analyze the maximum principal stresses, the minimum principal stresses, roof displacements, and plastic zone maps of the different schemes. Through the analysis of the simulation results, it is found that the optimization of the roof thickness from 8 m to 7 m and the stage height of 40 m are reasonable parameter combination, which can not only ensure the stope stability, but also improve the profitability of mining.
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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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