Full
Outline
To address the issues of instability, difficulty in support, and high support costs during the excavation of trapezoidal roadways, a support scheme for the roadway of 105 working face was proposed using theoretical analysis and numerical simulation methods, with a research background in a certain mine in Toksun. The support effect was verified using measured data. The research results indicate that under the existing support conditions, the mining pressure behavior of the 104 working face roadway is not obvious, the surrounding rock stability is stable, and there is no significant delamination phenomenon. On this basis, support scheme can be provided to the 105 working face. Compared with the theoretical analysis values, there is a certain optimization space for the existing support scheme, which can be optimized for design. The optimized support scheme has reduced the control strength of roof and two sides of the roadway, but the support cost has decreased by 32.5%. On-site application shows that during the roadway excavation, the deformation of the roof, the low side and the high side is relatively small, the maximum displacement are 19.6 mm, 21.2 mm, and 26.8 mm, respectively. During the mining period of the working face, the roadway and surrounding rocks of the working face are relatively stable, with no occurrence of high-energy microseismic events. The optimized support scheme can meet the safety requirements of roadway excavation and mining of the working face.
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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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