Full
Outline
Aiming at the problem of large loss and dilution in the ore drawing process of non-pillar sublevel caving method, physical ore drawing tests under different sublevel heights and end wall inclination angles were carried out, and the variation laws of the drawn-out body shape and the variation characteristics of the ore dilution rate and the recovery rate were obtained. The results indicate that when the sublevel height is constant, with the increase of the end wall inclination angle, the horizontal thickness of the drawn-out body along the route direction increases, the axial deflection angle increases, and the width and vertical height along the end wall decrease. During the process of ore drawing, and with the increase of the sublevel height, the time of waste rock release is later, the cumulative ore dilution rate is smaller. For different sublevel heights, when the end wall inclination angle is 90°, the cumulative ore dilution rate at each sublevel height is the smallest after reaching the cut-off grade. With the increase of the end wall inclination angle, the ore recovery rate at each sublevel height increases first and then decreases, and the maximum value will be obtained when the end wall inclination angle is 85°. When the end wall inclination angle are 85°, 90° and 95°, with the increase of the sublevel height, the ore recovery decreases first and then increases, and the minimum values can be obtained at the sublevel heights of 18.8 m,19.17 m and 18.73 m, respectively.
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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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