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Outline
In certain mining regions of China, the presence of thick overlying strata above the coal seam roof not only triggers rock burst disasters but also leads to significant seismic events. The occurrence mechanism of rock burst induced by thick overlying strata was analyzed. A strategy for controlling rock burst through grouting filling of the separated layer in the overlying strata was proposed. Numerical simulations and theoretical analysis were combined to investigate the load reduction and impact attenuation effects of grouting filling. The research findings indicate that in mines with thick overlying strata, the stress concentration and dynamic load intensity resulting from hanging wall effects are significantly great due to the large thickness, high strength, and considerable limit span of the rock layers. This makes them susceptible to rock burst disasters. The grouting filling technique, by filling the separated space, can support the thick overlying strata together with the surrounding rock mass, thereby reducing the sinking of the thick overlying strata. This approach effectively controls the fracture and movement of thick overlying strata, consequently reducing both dynamic and static loads and achieving the objective of minimizing dynamic overburden pressure. Numerical simulation results of grouting filling indicate that, compared to without grouting filling, the stress concentration coefficient around the separated space decreases by 8.89%,18.59%, and 35.96% when the grouting filling rates are 30%, 60%, and 90%, respectively. This decrease is associated with a substantial reduction in the height of the plastic zone and the degree of damage to the thick overlying strata, indicating that the grouting filling of separated layer can achieve the purpose of reducing load and preventing rock burst.
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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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