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In order to improve the grouting efficiency and accuracy of phosphogypsum based self-produced gas expansion slurry, the change in density of phosphogypsum based self-produced gas expansion slurry with time was analyzed. Based on fluid mechanics theory and the time-varying model of slurry density, a mathematical model of the seepage diffusion pressure of the slurry during the self-produced gas expansion stage was established. Through a self-built phosphogypsum based self-produced gas expansion slurry similar model experiment system, the seepage pressure variation of phosphogypsum based self-produced gas expansion slurry in the fracture network during the self expansion stage was studied, and the mathematical model of the seepage diffusion pressure of the slurry was modified to verify the rationality of the modified mathematical model of seepage diffusion pressure. The results show that the trend of slurry density over time follows a negative exponential power characteristic. During the self expansion process, the diffusion area of the slurry increases and the increase in diffusion area of the slurry becomes smaller and smaller. The relative error between the theoretical and experimental results of the seepage pressure at the monitoring point does not exceed 10%, proving the rationality of the modified mathematical model for seepage diffusion pressure.
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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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