An Energy Preservation Index for Evaluating the Rockburst Potential Based on Energy Evolution

Lin Gao, Feng Gao, Yan Xing and Zhizhen Zhang
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Lin Gao: School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou 221116, China
Feng Gao: State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, China
Yan Xing: School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou 221116, China
Zhizhen Zhang: School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou 221116, China

Energies, 2020, vol. 13, issue 14, 1-16

Abstract: The estimation of rockburst potential has attracted great attention in the field of rock mechanics and engineering. In this study, an original energy preservation index is proposed to evaluate the rockburst potential in view of the energy evolution characteristics of rock materials. To investigate the energy evolution during rock deformation and failure, a number of cyclic uniaxial compression experiments on five kinds of rocks were carried out. The results showed that the curves of energy evolution exhibited obvious stages and there were significantly different weakening degrees for different rock materials embodied by the decreasing degrees of the ratios of elastic strain energy to dissipated strain energy at the weakening stage. Then, the energy preservation index was further formulated based on the decreasing ratio. Furthermore, by analyzing the acoustic emission activities at the failure stage and failure modes of the five rock materials, the rockburst potential was analyzed according to the energy preservation index.

Keywords: rockburst potential; energy evolution; energy preservation index; cyclic loading–unloading test (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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