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Energies 2018, 11(9), 2313; https://doi.org/10.3390/en11092313

Mechanism Analysis of Roadway Rockbursts Induced by Dynamic Mining Loading and Its Application

Key Laboratory of Deep Coal Resource Mining, Ministry of Education of China, School of Mines, China University of Mining and Technology, Xuzhou 221116, China
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Received: 9 August 2018 / Revised: 26 August 2018 / Accepted: 31 August 2018 / Published: 2 September 2018
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Abstract

Roadway rockbursts seriously restrict the safety production of coal mines; however, the interaction between dynamic loads and roadway surrounding rocks has not been fully considered in existing studies. A dynamic failure analysis model of anchoring supporting structures was established to analyze dynamic effects of stress waves. Taking a rockburst in LW402103 of the Hujiahe coal mine as the case, the theoretical model was well applied and verified. The static cumulative resistance Qs (210.5 kN) which was incurred by deformation of rocks provided the basis (81.93% in the overall real-time resistance Q) of dynamic failures. However, the additional impact resistance Qd (46.43 kN) brought about by the energy release in the failure process of elastic zones triggered impact failures. As a result, under conditions that the overall real-time resistance Q (256.93 kN) exceeded the ultimate resistance [Q] (250.8 kN), the dynamic failure of supports occurred. The in situ application was implemented by taking pressure-relief measures and parameter optimizations of roadway supports, which achieved an effective prevention of rockbursts. View Full-Text
Keywords: rockburst; dynamic failure; anchoring supporting structure; pressure-relief measure rockburst; dynamic failure; anchoring supporting structure; pressure-relief measure
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Wang, Z.-Y.; Dou, L.-M.; Wang, G.-F. Mechanism Analysis of Roadway Rockbursts Induced by Dynamic Mining Loading and Its Application. Energies 2018, 11, 2313.

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