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Outline
Aiming at the problem of high filling cost and poor process stability caused by insufficient tailings production in a mine, the mechanical and rheological properties of Gobi sand-tailings synergistic filling body were studied. The effects of slurry mass concentration (74％, 76％, 78％), cement-sand ratio (1∶6, 1∶8, 1∶10, 1∶12), Gobi sand content (0, 10％, 20％, 30％) and curing age (3 d, 7 d, 14 d, 28 d) on the compressive strength of filling body and the transport resistance of filling slurry were discussed. Based on the MATLAB platform, the Random Forest (RF) and Convolutional Neural Network (CNN) models were constructed to predict the compressive strength of the filling body. The results show that the uniaxial compressive strength of filling body increases with the increase of slurry mass concentration, curing age and cement-sand ratio, and increases first and then tends to be stable with the increase of Gobi sand content. The transport resistance of filling slurry increases with the increase of slurry mass concentration, and decreases first and then increases with the increase of Gobi sand content. According to the uniaxial compressive strength of the filling body and the slurry transport resistance, the optimal content of Gobi sand is 20％. In the neural network model, the prediction accuracy of the CNN model is better than that of the RF model, determination coefficient R2＝0.970 34, the average absolute error MAE＝0.101 81, and the error between the predicted value and the experimental value is 0－10.53％. The research results can provide reference for the collaborative utilization of low-grade aggregate and the reduction of filling cost in the same type of mines.
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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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