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Outline
To investigate the influences of endwall roughness and ore grading condition on the ore drawing effect of non-pillar sublevel caving method, based on a single segment and single access ore drawing model, the joint roughness coefficient (JRC) of rock structure surface was introduced to quantify the endwall roughness. Physical experiments were conducted under five types of endwall roughness and two types of ore grading conditions, and the changes in recovery rate, dilution rate, and release amount of ore, as well as the development characteristics of the release body morphology, were systematically analyzed. The results indicate that the endwall roughness and the ore grading conditions have a significant impact on the flowability of the ore, thereby determining the variation characteristics of the recovery rate and dilution rate. As the proportion of fine particles in the ore grading and the endwall roughness decrease, the ore recovery rate shows an upward trend. The dilution rate shows a trend of first increasing, then decreasing, and then increasing again as both factors increase. When the content of fine particles is low and the JRC value is 0, the ore flowability is the optimal, the recovery rate is the highest at 75.15％, and the dilution rate is the lowest at 32.09％. In addition, reducing the proportion of fine particles in the ore grading and decreasing the endwall roughness can promote the development of the transverse axis length and suppress its height development of the ore release body, thereby increasing the ore recovery rate and optimizing the overall ore drawing indicators.
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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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