Full
Outline
To mitigate the impact of variations in cementitious material dosage and slurry mass concentration in backfill batching system on the strength prediction of backfill in the stope, the shrinkage characteristics of unclassified-tailings backfill slurry, which were strongly correlated with two factors, were selected as the research subject. Static shrinkage tests and uniaxial compression tests were conducted with different cement-tailing ratios (1∶4, 1∶8, 1∶20) and mass concentrations (70%, 72%, 74%, 76%). The random forest algorithm was selected to calculate the feature importance scores of different factors, and a compressive strength prediction model was constructed based on the shrinkage ratio. The model was validated by combining in situ measured data from an upward horizontal slice mining stope in a lead-zinc mine. The results are concluded as follows. Firstly, when the cement-tailing ratio is constant, the shrinkage ratio of the backfill slurry decreases gradually with the increase of mass concentration. When the mass concentration is constant, the slurry shrinkage ratio also exhibits a decreasing trend with the increase of cement-tailing ratio. Backfill slurry with low mass concentration and a low cement-tailing ratio is more prone to bleeding and segregation, which leads to the deterioration of backfill quality. Secondly, by using a random forest model to calculate the feature importance scores of each factor, it is identified that the cement-tailing ratio has the greatest impact on the compressive strength of the backfill material (93%), and the shrinkage ratio (5.6%) has a greater impact on the compressive strength than the mass concentration (1.4%). Thirdly, the engineering application results show that compared with the prediction method based on mass concentration, the prediction results of the uniaxial compressive strength of the backfill based on shrinkage ratio have smaller errors in most cases and have a better engineering applicability.
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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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