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Outline
Aiming at the problems of surrounding rock softening, failure of original support mode and roadway collapse in the process of excavation in the contact zone of north and south edge of a copper mine at the level of −400 m, the strength of engineering rock mass was determined by rock mechanics characteristic test, and the failure reason of original support was analyzed. FLAC3D numerical simulation software was used to explore the reasonable support parameters and support principle of prestressed anchor bolt, and the control effect of different support schemes on surrounding rock was compared. On this basis, a joint support scheme with anchor bolt spacing of 0.9 m, pre-tightening force of 90 kN and sprayed concrete thickness of 100 mm was proposed. The numerical simulation results show that the scheme can effectively reduce the plastic zone volume of surrounding rock, and control the roof subsidence and the total amount of two-side convergence of roadway within 21 mm and 19 mm respectively, which are reduced by 44.9% and 56.2% respectively compared with no support, and the support effect is good. The field application results show that the deformation of the roadway tends to be stable after 42 days. On the 91 st day, the roof subsidence is 28.74 mm, and total amount of two-side convergence is 22.32 mm. The scheme can meet the needs of mine safety production. It is reasonable and feasible to design and optimize the support parameters of prestressed anchor bolt in soft rock roadway based on FLAC3D.
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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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