Rockburst proneness criteria for rock materials: Review and new insights
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Rockburst proneness criteria for rock materials: Review and new insights GONG Feng-qiang(宫凤强)1, 2, WANG Yun-liang(王云亮)1, LUO Song(罗松)1 1. School of Resources and Safety Engineering, Central South University, Changsha 410083, China; 2. School of Civil Engineering, Southeast University, Nanjing 211189, China © Central South University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020 Abstract: To review the rockburst proneness (or tendency) criteria of rock materials and compare the judgment accuracy of them, twenty criteria were summarized, and their judgment accuracy was evaluated and compared based on the laboratory tests on fourteen types of rocks. This study begins firstly by introducing the twenty rockburst proneness criteria, and their origins, definitions, calculation methods and grading standards were summarized in detail. Subsequently, to evaluate and compare the judgment accuracy of the twenty criteria, a series of laboratory tests were carried out on fourteen types of rocks, and the rockburst proneness judgment results of the twenty criteria for the fourteen types of rocks were obtained accordingly. Moreover, to provide a unified basis for the judgment accuracy evaluation of above criteria, a classification standard (obtained according to the actual failure results and phenomena of rock specimen) of rockburst proneness in laboratory tests was introduced. The judgment results of the twenty criteria were compared with the judgment results of this classification standard. The results show that the judgment results of the criterion based on residual elastic energy (REE) index are completely consistent with the actual rockburst proneness, and the other criteria have some inconsistent situations more or less. Moreover, the REE index is based on the linear energy storage law and defined in form of a difference value and considered the whole failure process, and these superior characteristics ensure its accuracy. It is believed that the criterion based on REE index is comparatively more accurate and scientific than other criteria, and it can be recommended to be applied to judge the rockburst proneness of rock materials. Key words: deep rock; rockburst; rockburst proneness; rockburst proneness criterion; rock mechanics Cite this article as: GONG Feng-qiang, WANG Yun-liang, LUO Song. Rockburst proneness criteria for rock materials: Review and new insights [J]. Journal of Central South University, 2020, 27(10): 2793−2821. DOI: https://doi.org/10.1007/s11771-020-4511-y.
1 Introduction With the continuous development and utilization of underground space and mineral resources, more and more underground rock projects are being constructed at increasing depths [1−4]. During the excavation of deep buried caverns or tunnels, many unconventional
surrounding rock failure phenomena are often encountered, such as spalling (or slabbing) [5−7], rockburst [8−10]. Different from spalling failure, rockburst is a dynamic geological disaster of deep rock mass, which is usually caused by the sudden and violent rele
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