Full
Outline
When there is a cavity in the surrounding rock of the roadway, it will have a serious adverse effect on the stability of the roadway. In order to solve the problem of significant deformation and failure caused by the influence of filling unconnected roof cavity under the floor in the last sublevel stoping route of caving method stope in Longshou Mine of Jinchuan, the failure mechanism and support mode of the mining approach were studied by means of field investigation, numerical simulation and field test. The results show that the unconnected roof cavity is deformed under the action of stress concentration after the excavation of the approach, which leads to the synergistic deformation of the surrounding rock of the approach, and the existence of the cavity provides the development space for the deformation of the surrounding rock, which is the main reason for the serious deformation and failure of the approach. According to the position of the cavity and its control effect on the stability of the mining approach, an asymmetric support scheme was proposed. In this scheme, the unconnected roof cavity was regarded as the weak point of the whole support system to impose support, so as to reduce the adverse effect of the cavity on the stability of the approach. The field application results show that compared with the original support scheme, the asymmetric support scheme significantly improves the support effect, reduces the deformation of the two sides of the approach by more than 80%, and reduces the support cost by about 11.7%, which improves the stability of the stope and ensures the safe production of the stope.
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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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