Full
Outline
The porous and equal discharge technology for filling pipelines can eliminate the unattached goaf area formed by the self-flow gradient of the paste, improve the roof-contact effect of the mining site, and avoid the problem of roof subsidence. Firstly, through theoretical analysis, the head loss along the porous and equal flow discharge pipeline and the pressure head at each discharge hole were preliminarily determined, and on this basis, the diameter of the discharge hole was obtained. Then, using a self-developed porous and equal discharge test device, the influences of inlet flow rate, the number of holes, and hole spacing on the equal discharge effect were studied through experiments. Finally, numerical simulation methods were used to analyze the pressure and flow rate variations of the discharge pipeline. The results indicate that the spacing between the discharge holes has the most significant impact on the uniformity of discharge, followed by the number of holes. When the hole spacing is 14.5 cm, the flow rate at the inlet is 330 mL/h, and the number of holes is 6, the uniformity of discharge can reach up to 96%. When the paste flows in a horizontal pipe section, the static pressure of the pipeline decreases along the flow direction, and negative pressure appears at the discharge holes. The closer the discharge hole is to the inlet of the paste, the greater the pressure difference. After the paste reaches a stable state, the flow rate of each discharge hole is basically the same, and the uniformity coefficient reaches 98.8%, which means that the paste can achieve porous and equal discharge.
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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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