Full
Outline
The treatment of goafs is crucial for residual ore recovery. Selecting a backfill with reasonable strength to treat the goaf, so as to prevent the premature instability of pillars caused by stress concentration, is a key prerequisite for ensuring the safe and economic recovery of subsequent pillars. To address the problems of early left-over goafs and residual pillars in a certain fluorite mine, the short-hole shrinkage subsequent filling mining method suitable for medium-thick ore bodies was adopted to recover the pillars. Furthermore, the strength range of the backfill was preliminarily determined to be 1.06-2.08 MPa through theoretical empirical formulas, and then the final backfill strength was determined in combination with numerical simulation. The results show that when the backfill strength is 2.0 MPa, it can effectively alleviate the stress concentration phenomenon at the top and bottom of the backfill, reduce the pressure relief range of the side walls on both sides, ensure that the displacement and deformation of the backfill on the side walls of the pillar stope do not exceed 50 mm, and simultaneously avoid the large-area plastic zone penetration between the backfill and the pillar. After the goafs were treated with backfill with a strength of 2.0 MPa at the site, the cumulative volume of filled goafs is approximately 337 339 m3. A total of 83 000 t of residual roof and sill pillar ores are recovered, and the total profit reaches 36.88 million yuan. While ensuring safe underground recovery, the economic benefits of the mine are significantly improved.
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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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