Full
Outline
In order to solve the problems of significant reduction of rock mass mechanical strength, poor integrity and extremely complex mining technical conditions in the 28-48 line ore body area of the deep −625 m middle section of Lilou Iron Mine due to the influence of weathering zone and fault cutting. The rock mass quality evaluation of four kinds of ore rocks in the upper and lower plates of the ore body area was carried out. It is found that the surrounding rock of the roof is poor, and the outer roadway of the vein should be arranged as much as possible in the stable marble of the lower plate. Based on the rock mass quality evaluation and the roadway failure mechanism analysis, four schemes of no support, bolt+steel arch support, bolt-shotcreting support and bolt-shotcreting+steel arch combined support were selected. FLAC3D software was used to simulate and analyze the stability of surrounding rock of deep −625 m middle roadway under four support schemes. The results show that compared with the no support, the minimum principal stress under the scheme of bolt+steel arch support, bolt-shotcreting support and bolt-shotcreting+steel arch combined support is reduced by 4.05%, 14.02% and 11.59% respectively, and the maximum subsidence of vertical displacement of roof is reduced by 10.33%, 42.46% and 43.35% respectively. The support effect of roadway surrounding rock from weak to strong is no support<bolt+steel arch support<bolt-shotcreting support≈bolt-shotcreting+steel arch combined support, and the support effect of bolt-shotcreting+steel arch combined support scheme is the best. After comprehensive consideration, it is considered that the selection of bolt-shotcreting support scheme can meet the support requirements of most mine weathering zone areas. Only in the extremely broken area, the bolt-shotcreting+steel arch combined support scheme is recommended. The research results can provide a basis for the subsequent operation and production of deep middle roadway and stope mining.
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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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