Full
Outline
The extraction of overlain resources shall be conducted on the premise of service shaft safety. Taking an iron mine in Anhui Province as the research background, the disturbance influence exerted by the extraction of overlain resources on No.2 service shaft was studied. Mine geological surveys and analyses on physical and mechanical parameters of rock mass were carried out. Two mining schemes were determined by means of the empirical analogy method. Numerical simulations of the two mining schemes were performed via multi-software collaboration. The stability of the service shaft after the extraction of overlain resources was analyzed, and the feasible scheme was selected. Finally, the stress state around the service shaft under horizontal stress disturbance was analyzed by adopting the stress concentration principle of circular holes in thin plates. The research results show that both the two-step mining and skip-one-mine-one schemes for overlain resources are feasible. From the perspective of improving resource utilization, the scheme of mining rooms in the first step and extracting pillars in the second step with timely filling is preferred. The stress around the service shaft induced by mining disturbance is lower than twice the in-situ stress, and the shaft remains in a stable state. The research results provide technical support for the safe extraction of overlain resources around service shafts.
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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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