Full
Outline
In order to solve the problems of serious accumulation of solid waste and low overall strength of backfill in a mine, tailings and waste rocks were used as filling aggregate, and polypropylene fiber was added to prepare filling material. Through orthogonal test, the effects of cement-sand ratio, waste rock gradation index and fiber content on the slump of filling slurry and the strength of backfill were investigated, and the optimum ratio of filling material was determined. The results show that the primary and secondary factors affecting the slump of filling slurry are waste rock gradation index, fiber content and cement-sand ratio, while the primary and secondary factors affecting the 28 days compressive and tensile strength of backfill are cement-sand ratio, fiber content and waste rock gradation index. The decrease of cement-sand ratio and the increase of waste rock gradation index will weaken the strength of backfill. When the fiber content is 0.6%, the strength of backfill is the largest. The fitting function of the strength of backfill and the slump under the influence of the coupling of the main factors was constructed. According to the fitting function, the three-dimensional model diagram of the influence relationship between the main factors and the performance index of backfill was established, which conformed to the relationship of Z=Ax2+By2+Cx+Dy+Exy+F. Based on the orthogonal test and the actual needs of the mine, the optimal ratio parameters of the filling material are obtained: cement-sand ratio of 1:5, waste rock gradation index of 0.8, and fiber content of 0.6%. Under this condition, the fluidity of filling slurry and the strength of backfill can meet the filling requirements of the mine, and the cost of the filling material is relatively low.
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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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