Full
Outline
To solve the problem of the influence of disturbance induced by deep approach mining on roadway surrounding rock stability, Sanshandao Gold Mine was taken as the engineering background. Combined with FLAC3D numerical simulation and on-site monitoring data, the failure evolution laws of surrounding rock in sublevel roadways and stope main roadways under different approach parameters and stoping sequences were compared and analyzed. According to the displacement and stress distribution characteristics of roadways, the mining schemes were optimized. The results show that under the disturbance of approach mining, the displacement of roadway roof increases nonlinearly in four stages with the advancement of mining process. The displacement of stope main roadways is generally larger than that of sublevel roadways, and the stage with the fastest growth rate of roof displacement differs among different mining schemes. Thestress concentration levelin the sidewalls of stope main roadways and sublevel roadways is higher than that in the shoulders, and the stress growth rate on the right side of sublevel roadways is significantly greater than that on the left side, exhibiting asymmetric characteristics. In addition, when upward approach mining is adopted, the stress in stope main roadways undergoes obvious staged mutations, while the stress increaseis relatively gradual under downward approach mining. When the approach width increases from 4 m to 5 m, the increments of roadway stress and displacement are relatively small. However, when the approach width increases from 5 m to 6 m, the variation of approach width exerts a remarkable influence on roadway stability. Therefore, based on a comprehensive analysis of roadway stability and mining efficiency, the downward approach mining scheme with a width of 5 m better meets the requirements of on-site safe production. The on-site monitoring results further verify the reliability of parameter optimization. The research results can provide references for the layout and stability control of deep roadways.
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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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