Full
Outline
In order to meet the requirements of the two-step stope mining in the Peki Copper-Gold Mine of Serbia for the backfill strength and reduce the backfill cost, the backfill material mix ratio was optimized. The backfill strength in different parts of the stope was preliminarily determined by theoretical calculation, and several groups of indoor tests of backfill material mix ratio were carried out. The test shows that the uniaxial compressive strength of the backfill increases with the increase of the mass concentration of the backfill material and the cement-sand ratio. When the mass concentration is 68%, the cement-sand ratio is 1:6 and 1:8, the backfill strength can meet the strength requirements of the theoretical calculation. On this basis, the industrial test was carried out. The results show that the backfill strength requirements of the two-step stope mining can be met using 1:6 cement-sand ratio at the bottom of the first-step stope and 1:8 cement-sand ratio at the top and middle of the first-step stope. At the same time, compared with the original backfill ratio scheme, the backfill cost can be reduced by 2.53 yuan/t.
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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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