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Outline
The layered characteristics of rock mass in the main vein roadway of a lead-zinc mine in Yunnan with a buried depth of 1 500 m are obvious, the ground pressure is severe, and the stability control of surrounding rock mass is difficult. Based on the engineering geological investigation and test materials, the numerical model of engineering geological body was established using 3DEC numerical simulation software. The deformation and failure characteristics of surrounding rocks of roadway were compared under two working conditions of unsupported and designed support after excavation of roadway with different dip angles of the rock strata. Then, the actual deformation monitoring of roadway was carried out. It is found that the horizontal and vertical displacements of the roadway are significantly affected by the dip angle of the rock stratum. As the dip angle of the rock stratum increases, the horizontal displacement gradually increases and the vertical displacement gradually decreases. The deformation of surrounding rocks decreases obviously after roadway support, and the shape of plastic zone is similar to that of unsupported roadway, but the range is smaller. After applying the support, the roadway roof displacement monitoring was carried out. It is found that with the passage of time, the roof displacement gradually increases and tends to be stable after about 70 days, and the displacement of the roof gradually decreases with the increase of the dip angle of the rock stratum. Therefore, the support system used in mines can effectively reduce the deformation of roadway in deep layered rock mass, especially the horizontal deformation of the roadway vault and the vertical deformation of the right side, which is conducive to maintaining the long-term stability of the roadway.
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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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