Evaluation of rockburst proneness considering specimen shape by storable elastic strain energy  

作　　者：Song Luo Fengqiang Gong 

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

出　　处：《Deep Underground Science and Engineering》2022年第2期116-130,共15页深地科学（英文）

基　　金：National Natural Science Foundation of China,Grant/Award Number:41877272;Fundamental Research Funds for the Central Universities,Grant/Award Number:2242022k30054。

摘　　要：To systematically assess the rockburst proneness considering specimen shape,multiple groups of laboratory tests were performed on 5 rock materials in cylindrical and cuboid shapes.The linear energy storage(LES)law of both cylindrical and cuboid rock specimens under uniaxial compressive load was confirmed,and the energy storage coefficient was found to be unrelated to specimen shape.On the basis of LES law,two rockburst proneness indexes,namely the strain energy storage index(W_(et))and the potential energy of elastic strain(PES),were modified.Subsequently,the W_(et),PES,peak-strength strain energy storage index(W_(et))p,and peak-strength potential energy of elastic strain(PESp)were used to assess the rockburst proneness of the cylindrical and cuboid specimens.In addition,the fragment ejection course of specimens under test was recorded by a high-speed camera.Then,the rockburst proneness judgments obtained from the 4 indexes were compared with the qualitative data during rock destruction.The results show that,under similar stress conditions,specimen shape has an ignorable effect on the rockburst proneness as a whole.The judgment accuracy of the two modified indexes,especially that of the PESp,is favorably improved to evaluate the rockburst proneness of both cylindrical and cuboid specimens.However,misjudgment ofW_(et)^(p)and PESp may still occur in the assessment of rockburst proneness as these two indexes only consider the energy state before rock peak strength and the W_(et)^(p)is formulated in a ratio form.

关 键 词：cuboid specimen elastic strain energy energy storage rockburst proneness shape effect uniaxial compression 

分 类 号：TU45[建筑科学—岩土工程]