Abstract
To study the spatio-temporal evolution of cracks in roof overburden using the longwall N00 mining method, the high-precision microseismic monitoring system was used to conduct tests in the industrial test area in Nantiaota Coal Mine. The periodic breaking law of overburden fractures in the test working face, the vertical and horizontal gestation of microseismic events and the dynamic evolution characteristics of overburden fractures were studied. The results showed that the fractures were fully developed in the vertical direction from 21 to 85 m and in the inclination direction from 54 to 66 m, and they extended towards the upper and rear areas and the front area of the working face; and the evolution of stope fractures was divided into germination, development and climax stages. Many high-energy microseismic events were concentrated in the 30.65-m thick siltstone layer above the coal seam, belonging to the main key layer, which was located in the weakly weathered bedrock and its lower range. This area had the most microfissures and had a high degree of fissure development. There were many high-energy microseismic events concentrated in the area of medium sandstone with a thickness of 16.20 m above the coal seam, which belonged to the inferior key strata (basic top); periodic fracture and damage of overburden could be divided into that occurring in the initial period of mining, the middle period of mining and the end period of mining, and the periodic weighting step distance was 19.83 m. The theoretical model of the stope strike area was optimised, and the overburden of the working face could be divided into three areas along the strike direction: rock compaction area, rock layer breaking area and the advance affected area. A new idea of using the accumulative microseismic energy of periodic compression as the criterion for roof fracture and failure was proposed.
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This paper was funded by the National Natural Science Foundation of China (grant nos.: 51504189, 51904237, 51974241, 51874233).
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Liu, C., Li, X., Zhang, C. et al. The spatio-temporal evolution law of overlying rock fractures in an experimental working face (N00 mining method) based on microseismic monitoring technology. Arab J Geosci 14, 1373 (2021). https://doi.org/10.1007/s12517-021-07850-5
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DOI: https://doi.org/10.1007/s12517-021-07850-5