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Outline
In underground metal mining, the roof stability of stope is directly related to the overall safety of the high-stage filling stope. Taking 2 types of stopes with different heights in Zhongguan Iron Mine as the engineering background, by testing the range of loose ring of pre-control top roadway without mining influence, the appropriate length of anchor rod was selected, and four kinds of combined support schemes of “prestressed long anchor cable+anchor net spray” with different row spacings were proposed. The roof stability of stope in the process of multiple mining under different anchor cable row spacing conditions was simulated and compared to determine the optimal anchor cable row spacing and other support parameters. The results show that the loose ring range of the side of the pre-controlled top roadway in the 30 m height stope is 1.6−2.0 m, and in the 60 m height stope is 1.4−2.3 m. The selected length of anchor rod is 2.4 m. When the anchor cable row spacing is 3.5 m, 2.5 m and 1.5 m respectively, the support control effect of 30 m height stope is 37.15%, 37.50% and 26.25% higher than that of no anchor cable, anchor cable row spacing of 3.5 m and anchor cable row spacing of 2.5 m respectively. When the anchor cable row spacing is 5 m, 4 m and 3 m respectively, the support control effect of 60 m height stope is 36.65%, 34.00% and 30.35% higher than that of no anchor cable, anchor cable row spacing of 5 m and anchor cable row spacing of 4 m respectively. Considering the economic cost and construction intensity, it is determined that the anchor cable row spacing of 30 m and 60 m height stope pre-control top roadway is 2.5 m and 4.0 m respectively. It is verified by engineering practice that there is no caving in the process of mining, and the stability is good. The recovery rate is 88.25% and the dilution rate is 10.39%, which can be further popularized and applied.
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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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