Abstract
A serious rock burst (“4.19” event) occurred on 19 April 2016 in the No. 4 working face of the No. 10 coal seam in Da’anshan Coal Mine, Jingxi Coalfield. According to the China National Seismological Network, a 2.7 magnitude earthquake was simultaneously recorded in this area. The “4.19” event resulted in damage to the entire longwall face and two gateways that were 105 m in long. In addition, several precursor bursts and mine earthquakes had occurred between October 2014 and April 2016 in the two uphill roadways and the No. 4 working face. In this paper, the engineering geological characteristics and in situ stress field are provided, and then the rock burst distributions are introduced. Next, the temporal and spatial characteristics, geological and mining conditions, and other related essential information are reviewed in detail. The available evidence and possible explanations for the rock burst mechanisms are also presented and discussed. Based on the description and analysis of these bursts, a detailed classification system of rock burst mechanisms is established. According to the main causes and different disturbance stresses (i.e., high/low disturbance stresses and far-field/near-field high disturbance stresses), there are a total of nine types of rock bursts. Thus, some guidelines for controlling or mitigating different types of rock bursts are provided. These experiences and strategies not only provide an essential reference for understanding the different rock burst mechanisms, but also build a critical foundation for selecting mitigation measures and optimizing the related technical parameters during mining or tunnelling under similar conditions.
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Acknowledgements
The research described in this paper was financially supported by State Key Research Development Program of China (No. 2016YFC0801401), National Natural Science Foundation of China (No. 51604165, No. 51674160, No. 51474137 and No. 51704181), Shandong Province Natural Science Foundation (No. ZR2016EEB23), Tai’shan Scholar Engineering Construction Fund of Shandong Province of China, Taishan Scholar Talent Team Support Plan for Advantaged & Unique Discipline Areas. The authors thank the peer reviewers and Editors for their valuable comments and suggestions, which have greatly improved the manuscript.
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Zhao, Tb., Guo, Wy., Tan, Yl. et al. Case Studies of Rock Bursts Under Complicated Geological Conditions During Multi-seam Mining at a Depth of 800 m. Rock Mech Rock Eng 51, 1539–1564 (2018). https://doi.org/10.1007/s00603-018-1411-7
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DOI: https://doi.org/10.1007/s00603-018-1411-7