Full
Outline
Reasonable mining methods and stope structural parameters are crucial for ensuring the safety and efficient production of mines. According to the characteristics of large thickness variation of a copper ore body, combined with the analysis of rock mass joints and fissures, the evaluation of rock mass integrity, the allowable exposed area of ore rock and the self-stability ability of rock mass, the mining scheme of ore body was optimized. The stress, displacement, and failure laws within the stope mined by the upward horizontal filling mining method with reserved retaining wall were analyzed by FLAC3D numerical simulation software. The results show that the maximum tensile stress during the mining process does not exceed the tensile strength of the ore body. As the mining progresses, the maximum compressive stress migrates from the lower left tip of the goaf to the roof near the upper right tip, and as the stratification increases, the compressive stress at the tip gradually decreases. Under the condition that the exposed area is determined, the smaller the short-side span is, the greater the roof subsidence is. The mining process leads to the intensification of bottom stress and deformation, and the floor heave of the filling body floor and the surrounding rock of the footwall is significant. The shear failure is mainly concentrated at the tip of the goaf and extends to the deep part of the surrounding rock. Due to the presence of the hanging retaining wall, the sidewalls effectively block the expansion of the surrounding rock failure zone into the goaf, thereby enhancing the stability 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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