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Outline
Using high-sulfur tailings and gobi materials as mixed filling aggregates, the mechanical properties of high-sulfur tailings backfill excited by industrial magnesium slag were investigated. A preliminary test was conducted to investigate the effect of different magnesium slag contents on the compressive strength of the backfill. Using NaOH as an alkaline activator, the influence of proportioning parameters of high-sulfur tailings backfill on compressive strength, stress-strain curve characteristics, and failure mode was systematically analyzed through orthogonal tests. The results show that when the ratio of tailings to gobi material is 1:1 and the dosage of NaOH is 1%, the compressive strength of the backfill reaches its maximum value at 28 d, which is 4.54 MPa. NaOH has an optimization effect on the mechanical properties of high-sulfur tailings backfill excited by magnesium slag, and reasonable control of the dosage of high-sulfur tailings, NaOH, and magnesium slag can significantly improve the compressive strength of the backfill. Increasing the dosage of NaOH, magnesium slag, and high-sulfur tailings can enhance the mechanical strength of the backfill, but it will lead to a brittle transition in its failure mode and exacerbate local failure characteristics. The research results can provide a basis for the resource utilization of magnesium slag and high-sulfur tailings, as well as the performance optimization of mine filling materials.
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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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