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Outline
Aiming at the problem of dynamic disaster induced by multi-level combined mining in deep mines, the stress evolution law and deformation behavior characteristics of surrounding rock in multi-level mining area were studied. By means of geological survey, theoretical analysis and numerical simulation, the stability of the multi-level mining area of 03-011 line in the eastern part of 2 402-2 522 meter of Xitieshan Lead-Zinc Mine was analyzed, and the deformation and failure behaviors of surrounding rock and ore body in the mining process was demonstrated. The results show that the deformation and failure of the multi-level mining area in this mine mainly occur in the thick and large stope of individual ore bodies and the middle part of the regional mining. The maximum settlement of the top pillar position in the level of the mining status is close to 4 cm, and there is no greater risk. In the subsequent mining of 2 462 m level, the displacement of 14003-3 stope is the largest, and the settlement value exceeds 6 cm. The displacement of multiple stopes on both sides is about 5 cm, and there may be some stope collapse. Combined with the spatial and temporal evolution characteristics of deformation and failure in multi-level mining, aiming at the potential ground pressure in the mining process, the mining planning optimization has been carried out for the mining design, which can provide a theoretical support for the safe and efficient mining of multi-level in the subsequent mining area.
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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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