Full
Outline
With the depletion of shallow resources, deep mining has become the normal state of mineral resources development in China. Taking the approach stope at a buried depth of 1 000 min a mine in Yunnan as the research object, the borehole coring was carried out and the uniaxial compression test and Brazilian splitting test were carried out. Based on the Hoek-Brown criterion and Mohr-Coulomb criterion, the mechanical parameters of surrounding rock mass were obtained, and the numerical simulation study under different approach layout directions was carried out. The influence of principal stress direction on the stability of surrounding rock in approach stope was discussed, and the approach layout scheme was optimized. The test results show that the average uniaxial compressive strength, tensile strength and elastic modulus of the rock in the 1 000 m buried depth range are 96.48 MPa, 3.92 MPa and 33.87 GPa, respectively, and the rock has obvious brittle characteristics. The approach layout direction has a significant influence on the stability of the stope. The simulation results show that with the increase of the angle between the approach direction and the principal stress direction, the displacement and deformation range of the surrounding rock increases. When the approach direction is parallel to the principal stress direction, the displacement deformation of surrounding rock is the smallest and its stability is the best. Based on the numerical simulation results, the mechanical mining industrial test was carried out with the principal stress direction as the excavation direction, and the size of the stope approach was expanded to 4 m×4 m. It is found that the stability of the approach stope is good under the small operation disturbance of mechanical mining.
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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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