Full
Outline
To solve the problem of roof instability or insufficient production capacity caused by unreasonable values of stope structure parameters, an iron ore mine in Hebei Province was selected as the background to optimize the stope structure parameters and analyze their sensitivity. Firstly, a rock mass quality investigation was conducted and the extended Mathews stability chart method with stable probability was used to preliminarily determine the width and length range of the stope. Then, FLAC3D numerical simulation was used to explore the deformation law of the maximum displacement of the stope roof with the variation of structure parameters. Combined with response surface method, a prediction model for the displacement of the stope roof was constructed, and the sensitivity of the single factor affecting the displacement of the stope roof and their interaction relationship were explored. Finally, considering safety and block size, the stope structure parameters were optimized, and industrial experiments were conducted to verify the rationality of the results. The results indicate that the overall rating of the ore body is grade V, and the rock mass quality is very poor. The sensitivity of the roof displacement of the stope to various parameters, from high to low, is as follows: stope width, stope length, and stope height. The optimal stope structure parameters for this ore body are a width of 12 m, a length of 36 m, and a height of 60 m. When using the structure parameters for recovery, the contour of the goaf is relatively flat and stable. The research results can provide theoretical basis for selecting reasonable stope structure parameters and correctly coordinating stope safety and production capacity.
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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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