Full
Outline
Aiming at the failure mechanism and control problem of surrounding rock of deep buried solid coal rectangular roadway under thick loose layer and thin bedrock overburden structure, the influence of horizontal stress on the surrounding rock load of this kind of roadway was studied through engineering field investigation, numerical simulation, theoretical derivation and case application. Taking Guotun Coal Mine as the engineering background, the failure characteristics of surrounding rock of solid coal rectangular roadway under thick loose layer and thin bedrock overburden structure were revealed. According to the ground stress characteristics of deep buried roadway, the arch axis equation of balanced arch considering horizontal stress was deduced based on the balance of force and moment. The calculation method of surrounding rock load of rectangular roadway based on the improved model of balanced arch was proposed and programmed, which improved the analysis theory of balanced arch. The effectiveness of the improved balanced arch model was verified by engineering examples and two research cases, and the influencing factors of the failure height of the roadway vault and the roof load were analysed. The results show that the failure of the surrounding rock at the top of the rectangular roadway presents three obvious zones, namely, the broken caving zone, the fracture affected zone and the non-affected zone. The error between the damage range of the vault and the side calculated by the proposed theoretical method and the numerical simulation results is 7.4% and 14.0% respectively, and the error between the proposed theoretical method and the field detection results of similar roadway is 25.0% and 18.4% respectively. The comparative analysis results of the two engineering cases verify the rationality of the improved model of the balanced arch. The failure height of the roadway vault and the roof load decrease nonlinearly with the increase of the lateral pressure coefficient, and decrease linearly with the increase of the internal friction angle of the fragmentation. The research results have important guiding significance for the design of bolt/anchor cable support in this kind of roadway.
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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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