Full
Outline
Roadways are prone to deformation and failure under the influence of high in-situ stress as mining progresses to deep underground areas. Cracks in shotcrete, mesh fragmentation and weathering spalling of surrounding rock occur in the heavy haulage roadway of a crushing chamber in an ultra-deep metal mine. In-situ stress and rock mechanical parameters were measured by the hydraulic fracturing method and rock mechanics tests. Deformation characteristics of the roadway were analyzed via deformation monitoring, borehole photography and ground pressure monitoring, and the failure mechanism of surrounding rock was explored based on monitoring data. A combined support scheme was proposed, consisting of 30 mm thick initial shotcreting, 5 m long anchor cable for active support, steel mesh, U29 steel arch for passive support and 120 mm thick secondary shotcreting. Engineering practice shows that the bearing capacity of the surrounding rock is enhanced after reinforcement, no deformation and failure are observed, and the surrounding rock maintains a relatively stable state.
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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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