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Outline
To address the problems of low filling body strength and large surface subsidence in the current filling mining process of a coal mine in Jining, filling materials were prepared with fly ash as the main material and lime, β-gypsum, cement, sodium hydroxide, and compound additives (slag A, AEA-type expansive agent B, cement clinker C) as auxiliary materials. The influence of additive ratio on slurry flow performance, uniaxial compressive strength of filling body, hydration products, and microstructure was explored. The study shows that the flow performance of slurry has no linear relationship with changes in the content of each component in the additive. Under different additive ratios, the initial fluidity of the filling slurry is ≥22.2 cm and the dynamic viscosity is ≤218 mPa•s, which meets the self-flow requirement. When the content of other components is constant, with the increase in the content of components A, B, and C, the filling body strength at different curing ages all shows a trend of first increasing and then decreasing. Under different additive ratios, the hydration products of the filling body cured for 28 days are basically consistent, but there are differences in the intensity of diffraction peaks. The increase in the content of components A, B, and C can effectively improve the compactness and pore development of the filling body. However, when their content is excessive, the microstructure deteriorates. When the content of components A, B, and C is 14％, 6％, and 8％ respectively, the mechanical properties of the filling body are optimal. Its early-age (8 h) strength and long-term (28 d) strength reach 0.75 MPa and 4.33 MPa respectively, with the highest compactness and excellent flow performance.
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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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