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Outline
Rock burst is the main technical challenge that troubles the safe mining of phosphate mines in the western Hubei region. In order to reduce the rock burst risk of brittle direct roof of phosphate mines in western Hubei, taking the +80 m working face of Shaqihe Phosphate Mine as the research object, the applicability of different roadway section shapes in mines with brittle direct roof was analyzed, and an inverted trapezoidal section scheme conducive to prevention and control of rock burst was proposed. Numerical simulation method was used to study the distribution characteristics of stress, elastic energy, and displacement of surrounding rocks under different section shapes, the optimal section shape was selected, and the design of relatively safe and economical section parameters were optimized. Finally, engineering verification was carried out on the working face site. The results show that for mines with brittle direct roof, the stress concentration of the roof with rectangular section is the most significant, the roof subsidence of the positive trapezoidal section is large, while the roof stress distribution of the inverted trapezoidal section is relatively uniform, and the roof stress and elastic energy are obviously released, thus reducing the risk of rock burst. Thus, the inverted trapezoidal section is the optimal section shape, with corresponding parameters of 3.4 meters for the upper bottom, 3 meters for the lower bottom, and 4 meters for the height. After optimizing the roadway section, the rock burst of direct roof on the working face has been significantly reduced. The research results can provide a successful example for the prevention and control of rock burst in similar mine roadways in western Hubei.
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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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