Full
Outline
To solve the mining problem of orebody under the main transport roadway in the middle section of 790 m of a gold mine, an “Arch Bridge Method” mining scheme was put forward. The top pillar and interval pillar of the stope were simplified into a mechanical model, and the safety thickness of the top pillar under two constraints of fixed support and simple support was calculated as 7.09 m using the Reissner thick plate theory. The rationality of the “Arch Bridge Method” of 6 m width isolation interval pillar was verified using the Bieniawski pillar strength calculation formula. The “Arch Bridge Method” mining scheme with the interval pillar width of 6 m and the top pillar thickness of 6 m, 8 m, 10 m and 12 m respectively was designed. The FLAC3D numerical simulation software was used to simulate the influences of the width of the interval pillar and the thickness of the top pillar on the stability of the stope and the main transport roadway. The results show that based on the analysis of the stress field, displacement field, and plastic zone in the stope, the optimal thickness of top pillar for the “Arch Bridge Method” mining scheme is determined to be 10 meters. In the subsequent production practice, the loss rate, dilution rate and ore grade of the “Arch Bridge Method” mining scheme are similar to those of the upward horizontal layered filling mining method in the same stage. The production capacity of the stope is increased by 94.4%, and the transportation capacity of 900 t/d in the main transport roadway of 790 m is maintained, which provides a solution for the same mine problems.
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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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