Full
Outline
In order to study the damage effect of overlying strata and the movement and instability characteristics of overlying strata under mining in close-distance coal seams, based on the mining of a close-distance coal seam in Shendong mining area, the damage theory was used to analyze the instability and deformation characteristics of the overlying strata of the close-distance coal seam under mining and the time-space evolution law of microseismic. The damage characteristics of the close-distance coal seam considering the microseismic monitoring data were discussed. The 3DEC software was used to simulate the instability and fracture of overlying strata and the law of stress transfer in close-distance coal seams under mining. The results show that the damage evolution of overlying strata increases as the distance between the upper and lower coal seams approaches. The minimum damage degree is 0.31 and the maximum damage degree is 0.77 under different monitoring schemes. There is no obvious increase or decrease trend of microseismic events in the process of overhaul, and the number of microseismic events increases continuously as the closing distance between the upper and lower coal seam working faces during coal mining. The continuous advancement of the working face of the lower coal seam causes the displacement of the overlying strata to increase, and the maximum displacement of the overlying strata is 45.9 cm. The research results are of great significance for the stability control of overlying strata in similar close-distance coal seam mining and the safe and efficient mining of coal mines.
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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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