Full
Outline
The gently inclined thick ore body below －675 m level in Chengchao Iron Mine is mined by two-step mining with sublevel drilling open stoping and subsequent filling. According to the theoretical analysis results, three numerical simulation research schemes of mine room (pillar) span were formulated. The stress, displacement and plastic zone distribution of each scheme were compared and analyzed, and the influences of different spans of mine room (pillar) on the stability of stope was explored. The results show that when the span of mine room (pillar) is 15 m, the maximum tensile stress of the goaf roof is less than 2 MPa, and the maximum compressive stress is less than 5 MPa, which is within the allowable range of the rock mass. The maximum subsidence value of the goaf roof is less than 5 cm, which does not exceed the allowable limit displacement. There is no large area of plastic zone penetration in the structural plane of the goaf. When the span of the mine room is 18 m, the roof settlement is 52.3 mm (over the warning value of 50 mm), which need to be supported. It is determined that the span of mine room (pillar) is 15 m as the optimal scheme. The maximum vertical subsidence value of the monitoring points in the center of the roof is 0.033 7 m, and the maximum vertical subsidence value of the monitoring points in the center of the surrounding rock is 0.031 4 m. According to the evaluation results of the influence of ground deformation on the buildings (structures), the mining of the ore body below －675 m level will have a slight impact on the surface buildings (structures), and the influence degree is within the allowable range, which ensures the safety of the new Chengchao Bay country on the surface of Chengchao Iron Mine.
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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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