Full
Outline
In response to the cumulative damage of rock mass during the two-step mining of coppergold ore body using the sub-level stoping with delayed backfill method in a mine, acoustic wave detection technology was used to collect acoustic wave data of the ore body before blasting and during the blasting and mining process, and the ore body integrity coefficient results were combined with FLAC3D software to conduct numerical simulation analysis of the mining process. The results show that the ore body integrity is at level III before blasting and mining. After 3 to 4 rounds of blasting and mining operations, the cumulative damage degree of the ore body within a range of 4 rows (8.8 m) from the blast source is relatively large, and the integrity changes from level III to level V. The stress safety factors of the front and rear areas of the stope are both greater than 1.5, indicating that the roof and the filling body are overall stable. After the mining of the rear area of the stope, the plastic deformation areas of the roof and floor of the voids, as well as the surrounding rock and side wall filling body, significantly expand. It is recommended to backfill as soon as possible after mining to reduce the risk of collapse of the surrounding rock and the filling body.
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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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