Full
Outline
With the gradual reduction of shallow mining resources, mining is moving deeper and deeper. In order to solve the problems of difficult control of the stability of the surrounding rocks and increased support costs in large-section chamber in deep shaft, and to ensure the stable operation of the 941 m mixing plant chambers group, researches on the stability control of the surrounding rocks in large-section chambers was carried out. Multiple technical methods such as laboratory testing, numerical simulation, and field monitoring were adopted. Through comparative analysis, a reasonable construction process and support design were optimized. It is found that when the excavation of the chambers is carried out in the order of batching machine chamber, mixer chamber, and cement silo chamber, the stability of the surrounding pressure is the best. Then, an orthogonal design experiment was used to obtain the optimal support parameters as a spacing of 2 m×2 m among anchor rods, a length of 6 m for anchor cables, and a thickness of 600 mm for concrete lining. A joint support scheme consisting of anchor mesh spraying + grouting anchor rods for initial support and cast-in-place reinforced concrete + anchor cables was proposed. The on-site support results show that the deformation of the surrounding rocks is effectively controlled.
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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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