Full
Outline
In order to solve the problem of roof instability and material waste caused by unreasonable value of roof support parameters, the optimization of support parameters was studied based on the research background of the north stope of Zhongguan Iron Mine. Firstly, based on the suspension theory and the loose circle theory, combined with the numerical simulation results without support, the plastic zone was used as the basis for the determination of the loose circle, and the thickness of the loose zone was obtained, and then the length of the bolt was 2.4−4.4 m. Secondly, according to the quality of rock mass, the designed row spacing between bolts was 0.8 m×0.8 m and 1.2 m×1.2 m respectively, the length of bolts was 2.4 m and 4.4 m respectively, and the anchoring force was 17.5 MPa and 20 MPa respectively. The FLAC3D software was used to establish the mining model, and the vertical stress, vertical displacement and plastic zone distribution of the roof of each scheme were compared and analyzed. Finally, based on the simulation results, the index satisfaction method was used to select the roof settlement, the height of the stress release zone, the area of the plastic zone and the total length of the bolt, and the optimization model of the bolt parameters considering the safety and economic benefits was established. The highest comprehensive satisfaction is 0.899, and the optimal scheme is determined to be a row spacing between bolts of 0.8 m×0.8 m, bolt length of 4.4 m and anchoring force of 20 MPa. The simulation results provide theoretical support for the determination of the bolt parameters of the ore body.
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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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