Full
Outline
The stress concentration of the roof and the solid coal side will be caused by the untimely collapse of the lateral hard roof in the gob-side roadway, which poses a major threat to the safety of the working face, and the blasting method is often used to weaken it. Taking the gob-side roadway of a working face as the background, the relationships among blasting angle, blasting height and pressure relief effect of the hard roof in the gob-side roadway were studied by means of theoretical analysis, numerical simulation and field practice. The results show that the fracture position on the goaf side is the most conducive to maintaining the stability of roadway surrounding rock during the blasting of gob-side roadway. The blasting angle should be higher than the breaking angle formed when the key stratum is broken, and the roof pressure above the coal pillar after blasting should be avoided. In the range of reasonable blasting angle, with the increase of blasting angle, the pressure relief effect is improved. When the blasting height reaches the top of the combined sub-key stratum, a better pressure relief effect can be achieved. The field engineering practice shows that under the condition of reasonable parameters, the implementation of strike blasting on the roof of gob-side roadway can effectively reduce the impact risk and ensure the safe production of working face. The research results can provide theoretical and engineering basis for mines with similar conditions.
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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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