Full
Outline
To address the frequent occurrence of surrounding rock instability such as roof fall and rib spalling in roadways with weak interlayers at a working face of Wengfu Phosphate Mine, field investigations and FLAC3D numerical simulations were conducted, and the surrounding rock control effects of conventional bolt-mesh-shotcrete support and the composite support technology of "bolt-mesh-shotcrete+steel arch+advanced support" were systematically compared. The research results show that the weak interlayer contains 3.9% kaolinite, and expansion and softening after water immersion are the main causes of surrounding rock deterioration. The vertical displacement of the roadway is reduced from -8.33 mm to -6.67 mm by the composite support technology, with a decrease of 19.93%. The horizontal displacements in X and Y directions are decreased from 2.61 mm and -1.64 mm to 1.27 mm and -0.58 mm, with reductions of 51.34% and 64.63% respectively. The stress concentration is remarkably alleviated, and the total number of failure units is lowered by 13.82%. It is shown by field application that the average monthly accident rate is reduced from 0.6 times to 0.27 times, with a decrease of 55.0%. The large deformation of surrounding rock under multi-thin interbed conditions is effectively controlled by the composite support technology. A theoretical basis and key technical paradigm are provided for the safe excavation of roadways containing dense weak interlayers.
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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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