Full
Outline
The waste rock cemented backfill often exhibits stratification during the filling process. Therefore, a study was conducted on the filling effect of layered backfill. Slicing of waste rock cemented backfill was carried out, and the distribution characteristics of aggregates in different layers of the backfill were analyzed. Then, through numerical simulation, the influences of layered and non-layered waste rock cemented backfill on the filling effects of goaf were compared and analyzed. It is found that the stress in the middle of the roof of the goaf filled with layered waste rock cemented backfill and non-layered waste rock cemented backfill is about 3.68 MPa and 3.61 MPa, respectively. The settlement degree of the roof of the non-layered backfill is significantly smaller, which can provide more stable support for the roof. The lateral support of the non-layered backfill is uniformly stressed, with a small displacement and a maximum displacement of 3.76 mm. The lateral displacement of the layered backfill is small in the upper part and gradually increases downwards, with a maximum displacement of 4.46 mm. The distribution of fine aggregates in the upper layer of layered backfill makes it susceptible to pressure deformation, while the waste rocks distribution inside the non-layered backfill is uniform, with a stronger overall bearing capacity and relatively smaller deformation.Therefore, when carrying out the filling material proportion, it is important to control the backfill layering phenomenon as much as possible to provide important guarantees for mine safety production.
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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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