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Outline
To investigate the effect of vertical isolation columns on the stability of surrounding rock during the deep mining of gently inclined thick ore bodies, a numerical simulation method was used to compare and analyze the settlement, stress, and plastic zone changes of surrounding rocks under four different schemes for a deep mining project of an iron mine in Shandong. The optimization ratio of vertical isolation columns per unit volume was proposed, and the scheme was optimized on this basis. The results indicate that the volume and position of vertical isolation columns in the deep mining process of gently inclined thick ore bodies have a decisive impact on their optimization effect. The optimal scheme is to leave a vertical isolation column with a width of 20 m and a thickness of 41 m on the 8# vertical survey line where the settlement peak is generated (Scheme 4), which generates the maximum unit volume optimization ratio of settlement peak, stress peak, and plastic zone. Compared to Scheme 2, Scheme 4 can ensure the stability of the surrounding rocks more effectively. Compared to Scheme 3, Scheme 4 can extract an additional 461 700 tons of iron ore and 272 403 tons of refined iron ore powder, increasing the net profit of the enterprise by about 54.48 million yuan and increasing the net profit income by about 11.20%. The research results can provide some reference for the optimization and application of vertical isolation column retention schemes in similar mines.
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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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