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The Shaiqihe Phosphate Mine in Yichang, Hubei has entered deep mining, and rock burst disasters are frequent in the excavation working face. Water injection was used to soften the surrounding rocks in the working face to prevent rock burst, and reasonable water injection parameters affected the prevention and control effectiveness of rock burst. The uniaxial compression tests of phosphorite under different water-containing states were carried out. The relationship between water content and rock burst tendency of phosphorite was analyzed based on the rock strength brittleness coefficient. Numerical simulation was used to explore the distribution characteristics of water content in the surrounding rocks of the working face during water injection, and the optimal water injection parameters for the excavation working face of the Shaiqihe Phosphate Mine were determined. The results show that when the water content of the phosphorite reaches 0.424%, the phosphate rock layer is in a moderate rock burst tendency, and the change in strength brittleness coefficient with water content is no longer significant after water injection. When the water injection time is 1 hour and the drilling depth is 10 meters, the growth rate of effective wetting distance is the highest, and the water injection effect is the best. The research results have certain guiding significance for improving the water injection process parameters of phosphate rock and reducing the risk of phosphate rock burst.
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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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