Full
Outline
To address the stability challenges of stopes under high in-situ stress and complex geological conditions in deep mining operations, based on the engineering background of Sishanling Iron Mine, a "theoretical-empirical-numerical" collaborative optimization method for the stope structure parameters was established. Firstly, using the Mathews stability graphical method, the exposed area of the stope and the safety range of the pillars were initially screened based on the correction value of the Q system and the shape factor. Secondly, through engineering analogy analysis of the experience of similar stopes in both domestic and foreign regions, the reasonable exposed area of the roof and the geometric parameters of the stope were determined. Finally, a three-dimensional discrete element numerical simulation was employed to construct the mining excavation model. The stress, displacement, volume of the plastic zone, and the number of tensile fractures for the three different mining structure parameter schemes were quantitatively evaluated to determine the optimal scheme. The results show that the optimal parameters for the mining room are 80 m (length）×20 m (width）×60 m (height). The roof settlement (1.76 cm) and sidewall displacement (4.46 cm) of this scheme are both below the safety threshold, and the volume of the plastic zone (23 543 m3) and the number of tension fractures (2 157) are significantly better than those of other schemes. After the stope excavation, the roof of the working face mainly undergoes tensile failure, while the side walls exhibit a mixed failure mode of tension and shear. This stress redistribution characteristic provides a quantitative basis for the design of support structures and disaster prevention. The multi-method collaborative optimization system provides a scientific basis for the design of stope structure parameters, and has significant engineering reference value for deep well mines with a depth of several kilometers.
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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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