Full
Outline
The transport performance of paste filling slurry and the backfill strength are important contents of filling process. In order to explore the transport performance of paste filling slurry with coarse aggregate and the evolution law of backfill strength in a mine, the response surface method was used to carry out the fluidity test of filling slurry and strength ratio experiment of backfill. Based on the response surface test results, the effects of single factor and multiple factors interaction such as proportion of coarse aggregate, cement-sand ratio and mass concentration on the transport performance of the filling slurry and the strength of the backfill were analyzed. The results are shown as follows. Firstly, under the influence of a single factor, the sensitivity factors of backfill strength from large to small are cement-sand ratio, mass concentration and proportion of coarse aggregate; for the slump of filling slurry, the sensitivity factors from large to small are the proportion of coarse aggregate, mass concentration and cement-sand ratio. Secondly, based on the response surface method, the response regression model of the slump of filling slurry and backfill strength was established. The predicted value of the model has a good linear relationship with the test value, and the model has high fitting degree and high reliability. Thirdly, the interaction between mass concentration and cement-sand ratio has the most significant influence on backfill strength, the interaction of proportion of slump and mass concentration has the most significant effect on the slump of filling slurry. Finally, the parameters of backfill strength and slump of filling slurry has been optimized as follows, proportion of slump of 30.7%, cement-sand ratio of 1:6, and mass concentration of 82%. Under this condition, the errors between the experimental values and the predicted values of the backfill strength and the slump of filling slurry are within 5%, which verifies that the application of the response surface analysis method in optimizing backfill strength and filling slurry slump is reliable.
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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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