Full
Outline
In order to solve the problem of difficult roadway support in deep crushed surrounding rocks, the range of plastic zone was studied. Taking the roadway in the crushed section of a mine as the engineering background, the current situation of roadway damage was investigated, and from the physical properties of the roadway surrounding rock itself, the influences of cohesion and internal friction angle on plastic zone were analyzed by theoretical analysis and numerical simulation system. The results show that the reason for the failure of the roadway under the original support is the poor nature of the surrounding rocks and the neglect of the plastic zone by the support parameters. The cohesion and internal friction angle of surrounding rocks have a significant influences on the range of plastic zone. When the cohesion and internal friction angle are large, the range of plastic zone is small and the surrounding rocks of roadway tend to be stable. When the internal friction angle is 35° and the cohesion is 3 MPa, the change curve of the plastic zone radius turns, which indicates that the combined parameters are the key threshold of the bearing capacity of the surrounding rocks. According to the theoretical analysis and numerical simulation results, the combined support scheme of "anchor (rod), net, spray + full-section anchor cable" was proposed. The field displacement monitoring shows that the maximum deformation of the two sides is about 40 mm, and the maximum deformation of the surrounding rocks of the roof and floor is about 61 mm, which effectively guarantees the stability of the surrounding rocks. The research results provide a theoretical basis for the support technology of deep crushed surrounding rocks in 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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