Full
Outline
In the downward drift filling mining method, the roof backfill is usually divided into a bearing layer and a capping layer, and their strength is a key factor to ensure roof stability during the drift mining process. Force analysis was carried out on the downward rectangular drift. Considering that both sides of the drift were backfill, the strengths of the bearing layer and capping layer of the drift backfill were designed respectively by combining the stress solution method for rectangular openings based on complex functions with the unconfined compressive deformation test and shear strength test of backfill. An on-site industrial application was carried out in a metal mine in Yunnan to verify the rationality of the designed strength. The results show that when the lateral pressure coefficient of the backfill is 0.29, and the height-width ratio of the rectangular roadway is set to 1.0, the tensile strength of the bearing layer is designed as σt＝0.26 MPa and the compressive strength of the capping layer as σc＝2.88 MPa with a safety factor of f＝1.5. During the mining and filling process of the underground stope, no phenomena of lateral collapse of the backfill or roof caving are observed. The designed strength meets the requirements of on-site safe operation, and it is estimated to save the mine a filling cost of 5.58 million yuan per year.
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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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