Full
Outline
Revealing the distribution of abutment pressure in the superimposed affected area of goaf is the basis for carrying out the prevention and control of rock burst during excavation in this area. Taking the excavation of the 71330 track roadway in Tianchen Coal Mine as the engineering background, the spatial structure of overlying rock and the evolution characteristics of abutment pressure in the superimposed affected area of goaf were studied through theoretical analysis and numerical simulation. Corresponding countermeasures for prevention and control of rock burst were proposed, and these countermeasures were verified through on-site monitoring data. The results show that a single goaf forms an U-shaped spatial structure of overlying rock, with a relatively low degree of vertical stress concentration. When there are multiple goafs, a S-shaped spatial structure of overlying rock is formed on one side, and the degree of vertical stress concentration in its superimposed affected area is relatively high. During the excavation in the superimposed affected area of goaf, the degree of vertical stress concentration increases further. Adopting the “release-cutoff-reduction-impact resistance” countermeasures has achieved effective prevention and control of rock burst during excavation in the superimposed affected area of goaf. Microseismic events show the characteristic of “high frequency and low energy”. The load of anchor bolt (cable) to support roadway surrounding rock is lower than its fracture limit, and the observation value of the roadway side stress tends to be stable 30 days after point layout. The research results can provide a reference for the prevention and control of rock burst under 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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