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Outline
The stability of deep roadway is one of the keys and difficulties in deep mining. Taking the deep mining of a hard rock metal mine as the engineering background, according to the ground pressure stress test results, FLAC3D was used to construct the numerical model, and five representative altitudes were selected to quantitatively analyze the auxiliary ramp stability under different support schemes from four aspects of stress, displacement, strain and plastic zone. The results show that when the circular arch is supported by C30 shotcrete with a thickness of 100 mm, the auxiliary ramp can remain stable at elevations of 2 325 m or above, but it is unstable at elevations of 2 175 m and 1 950 m, so it needs to be strengthened. When the floor is laid with C30 cast concrete with a thickness of 300 mm, the floor within the elevation range of 2 850 m to 1 950 m shows unstable conditions. Three schemes of strengthening support were studied respectively: only increasing the shotcrete strength of the arc arch support body, only increasing the shotcrete support thickness, and extending the arc arch support body into a cylindrical support structure. The results indicate that none of these schemes can maintain the stability of the deep section of the auxiliary ramp. A joint support scheme of "cylindrical structure+sprayed steel fiber concrete+lagged floor building" was proposed. Calculation results has verified the feasibility of this scheme, which is recommended for the auxiliary ramp below the elevation of 2 325 m in the mine. The supporting body is cylindge-shaped CF35 sprayed steel fiber concrete with a thickness of 100 mm.
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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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