Full
Outline
Taking Dahongshan Iron Mine as the engineering case, the study on the treatment of hidden goafs in open-pit slopes was carried out by combining theoretical analysis with numerical calculation. According to the relationship between goaf morphology and open-pit boundary, a treatment scheme of "blasting of goafs inside the boundary and filling of goafs outside the boundary" was proposed. The safety thickness of the goaf roof was determined, the progressive failure mode of the slope above the goaf was revealed, the treatment scope of goaf filling and the compressive strength threshold of the filling body were obtained, and the stability of the open-pit slope after goaf treatment was evaluated. The results indicate that the safety thicknesses of the goaf roofs inside and outside the open-pit boundary are 20-30 m and 20-25 m, respectively. The slope containing hidden goafs has successively experienced the failure processes of tensile cracking at the slope rear edge, progressive failure of goafs, local slope collapse, and large-scale slope instability. The filling treatment range for Layer Ⅱ and Layer Ⅲ goafs is 30 m from the slope side, and the compressive strength of the filling body should reach 20 MPa. After the filling treatment of goafs outside the open-pit boundary, the shear strain of the slope rock mass is reduced and transferred to the interior of the slope, and the safety factor of the slope can meet the stability requirements.
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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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