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Outline
The traditional theoretical methods mostly use semi-quantitatively to analyze the safety thickness of the goaf roof, which can not fully reflect the stress and failure mode of the roof. Therefore, the cusp mutation theory was introduced to study the safety thickness of the goaf roof, the research model of the safety thickness of the roof was established, and the formula of the minimum safety thickness of the roof was derived. Based on the occurrence status of goaf in Dabaoshan Mine, the theoretical values of safety thickness of goaf roof under different lithology and different span conditions were calculated. Finally, the formula was verified by the traditional theory and the finite element numerical simulation method. The research results show that it is feasible to introduce the cusp mutation theory into the study of the safety thickness of the goaf roof, and the derived formula of the minimum safety thickness of the goaf roof is reasonable and reliable. Under the conditions of the slightly weathered limestone, slightly weathered secondary dacite-porphyry, copper-sulfur ore body, and sandstone-rock group in Dabaoshan Mine, the safety thickness of the goaf roof calculated based on the cusp mutation theory is 7.3 m, 12.5 m, 9.5 m, and 22.1 m, respectively, which can be used as the basis for on-site goaf treatment.
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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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