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Outline
In order to enhance the shear performance of graphite tailings, based on the indoor direct shear test, the effects of clay content, water content, quicklime content and polypropylene fiber content on the shear strength of graphite tailings were determined by single factor test. The optimum mix ratio of clay, water and quicklime was obtained by response surface method (RSM), and the optimum mix ratio scheme was verified. The microscopic characteristics of the samples were analyzed by scanning electron microscopy. The results show that with the addition of clay, water, quicklime and polypropylene fiber, the shear strength and cohesion of the solidified graphite tailings increase first and then decrease, and the internal friction angle tends to be stable.When the clay content is 29.38%, the water content is 15.82%, and the quicklime content is 3.59%, the cohesion of the solidified graphite tailings reaches the best, which is 9.417 3 kPa. The average cohesion obtained by the test is 9.487 kPa. The relative error between the predicted value and the test value is 0.7%, less than 5%, which verifies the feasibility of the response surface design model.The SEM results show that the agglomeration structure is formed between the modified graphite tailings particles and the clay, which improves the shear strength of the solidified material. The research results are of great significance to the reinforcement and protection of graphite tailings reservoir slope.
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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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