Abstract
The movement of hard and thick key stratum during underground coal extraction via longwall top coal caving differs from that of other types of overlying strata. Therefore, numerous problems such as roadway instability, rock burst and strong mining-induced mine seismicity will be encountered as a result of the fracture of a hard and thick key stratum. The key to controlling the behavior of strata is to understand the movement and fracture pattern of the hard and thick key stratum. Taking the 103up02 working face of Baodian coal mine as a case study in this study, according to the in situ measured microseismic data, the rule of fracture of overlying hard and thick sandstone caused by working face mining is studied, and the mechanism of dynamic pressure impact induced by hard and thick strata fracture is explained. Finally, the dynamic pressure control technology is put forward. The research results are of great significance for coal mining under hard and thick strata, mastering the fracture rules of hard and thick strata and predicting dynamic disasters.
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Acknowledgements
This paper was financially supported by the National Natural Science Foundation of China (Grants 51374155, 51704182, 51704185), Natural Science Foundation of Shandong Province (Grants ZR2017BEE045, ZR2017BEE050), Shandong Province Key Development Projects (Grants 2017GGX2015, 2017GGX90102), and the Graduate Innovation Fund of Shandong University of Science and Technology (Grant SDKDYC180305).
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Wu, Q., Jiang, J., Wu, Q. et al. Study on the Fracture of Hard and Thick Sandstone and the Distribution Characteristics of Microseismic Activity. Geotech Geol Eng 36, 3357–3373 (2018). https://doi.org/10.1007/s10706-018-0538-3
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DOI: https://doi.org/10.1007/s10706-018-0538-3