Full
Outline
In the transition process of open-pit to underground caving mining, with the deformation and fracture of the overlying surrounding rocks, its permeability increases sharply, which provides channels for heavy rainfall infiltration and easily induces disasters such as underground water inrush. In order to accurately evaluate the runoff infiltration in the subsidence area under heavy rainfall conditions, taking Shilu Iron Mine as the engineering background, a calculation method of rainfall infiltration based on the accurate division of surface catchment infiltration area was proposed. Hydrologic Engineering Center's River Analysis System (HEC-RAS) was used to delineate the catchment area outside the subsidence area. Combined with the numerical simulation results of surface subsidence deformation and surface catchment in the mining area, the infiltration areas such as caving zone, water-conducting fracture zone and runoff zone under different mining conditions were divided, and the rainfall infiltration under rainstorm conditions was calculated in different areas. The results show that the runoff infiltration in the subsidence area of the North No.1 stope increased from 182 874 m3/d under the current condition to 218 118 m3/d at the end of mining, with an increase of 19.3%. Three anti-seepage grade areas were further divided, and anti-seepage measures were proposed for different areas. Among them, the area where the caving zone and the water-conducting fracture zone were submerged by water was the first-level anti-seepage area, and the comprehensive anti-seepage measures of layered filling ground cracks, laying anti-seepage film and pumping were adopted. The research results can provide scientific basis for the design of mine drainage system and the prevention of water inrush disaster.
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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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