Full
Outline
The stability maintenance of roadways with soft and broken surrounding rocks under complex conditions has always been a key technical challenge in the mining industry. To solve the problem of large deformation and damage in the short term after excavation and support in Longshou Mine of Jinchuan, research on secondary support of roadway with soft and broken rocks was carried out. The on-site investigation and analysis of the failure mechanism indicate that the main reasons for the instability of the roadway are the soft and fracture of the surrounding rocks and the failure of the floor filling to connect with the roof cavity. On this basis, a secondary support scheme of “grouting+anchoring net” was proposed, with 5 grouting holes evenly arranged on each grouting section, with a grouting hole depth of 2.2 m and a grouting spacing of 2 m. The parameters of the secondary anchoring net were the same as those of the initial support. The on-site application results show that the secondary support scheme significantly suppresses the deformation and damage of the roadway, reduces the deformation of the drift by more than 80%, and reduces the failure rate of the eyebrow line by 50%. There are no large-scale repairs during the entire production cycle, and the support effect is long-lasting and stable. The research results can provide reliable technical reference and practical basis for the support design of roadway with soft and broken rocks in similar mines.
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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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