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Outline
Aggregate size distribution of waste rock and the cement-sand ratio of backfill slurry have a significant effect on the mechanical properties of waste rock cemented backfill. In order to explore the relationship between the two and the mechanical properties of the backfill, the backfill ratio tests were carried out. The particle flow model was constructed. The laws of crack development, force chain evolution and particle failure in the process of uniaxial compression of waste rock cemented backfill were analyzed. The results show that the higher the cement-sand ratio, the higher the sensitivity of the strength of waste rock cemented backfill to the change of fractal dimension of aggregate size distribution. When the cement-sand ratio increases from 1:8 to 1:4, the strength range of samples with different fractal dimensions increases from 0.40 MPa to 1.54 MPa. In the cemented backfill, the interface between the aggregate and the cemented matrix is easy to be destroyed along the aggregate boundary and develops along the interface. With the increase of fractal dimension, the proportion of fine aggregate in the sample increases, and the proportion of shear crack increases. In addition, the higher the fractal dimension, the more conducive to the uniform distribution of the cemented matrix, which can better participate in the bearing capacity. In the design of backfill scheme, the strength of backfill can be flexibly adjusted to meet the actual needs by changing the fractal dimension of waste rock aggregate.
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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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