Rockburst proneness considering energy characteristics and sample shape effects  

作　　者：Song Luo Fengqiang Gong Kang Peng Zhixiang Liu 

机构地区：[1]School of Resources and Safety Engineering,Central South University,Changsha,410083,China [2]School of Civil Engineering,Southeast University,Nanjing,211189,China

出　　处：《Journal of Rock Mechanics and Geotechnical Engineering》2024年第7期2441-2465,共25页岩石力学与岩土工程学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.41877272 and 42077244);the National Key Research and Development Program of China e 2023 Key Special Project(Grant No.2023YFC2907400).

摘　　要：Accurate prediction of rockburst proneness is one of challenges for assessing the rockburst risk and selecting effective control measures.This study aims to assess rockburst proneness by considering the energy characteristics and qualitative information during rock failure.Several representative rock types in cylindrical and cuboidal sample shapes were tested under uniaxial compression conditions and the failure progress was detected by a high-speed camera.The far-field ejection mass ratio(FEMR)was determined considering the qualitative failure information of the rock samples.The peak-strength energy impact index and the residual elastic energy index were used to quantitatively evaluate the rockburst proneness of both cylindrical and cuboidal samples.Further,the performance of these two indices was analyzed by comparing their estimates with the FEMR.The results show that the accuracy of the residual elastic energy index is significantly higher than that of the peak-strength energy impact index.The residual elastic energy index and the FEMR are in good agreement for both cylindrical and cuboidal rock materials.This is because these two indices can essentially reflect the common energy release mechanism characterized by the mass,ejection velocity,and ejection distance of rock fragments.It suggests that both the FEMR and the residual elastic energy index can be used to accurately measure the rockburst proneness of cylindrical and cuboidal samples based on uniaxial compression test.

关 键 词：Rockburst proneness Sample shape Strain energy Energy release Far-field ejection mass ratio(FEMR) 

分 类 号：TU45[建筑科学—岩土工程]