Dynamic buckling mechanism of pillar rockbursts induced by stress waves

作     者：J.Deng N.S.Kanwar M.D.Pandey W.-C.Xie 

作者机构：Department of Civil EngineeringLakehead UniversityThunder BayOntarioP7B 5E1Canada Centre of Excellence for Sustainable Mining and ExplorationLakehead UniversityThunder BayOntarioP7B 5E1Canada Department of Civil and Environmental EngineeringUniversity of WaterlooWaterlooOntarioN2L 3G1Canada 

出 版 物：《Journal of Rock Mechanics and Geotechnical Engineering》 (岩石力学与岩土工程学报（英文版）)

年 卷 期：2019年第11卷第5期

页      面：944-953页

核心收录：

学科分类：08[工学] 0801[工学-力学（可授工学、理学学位）] 

基　　金：supported in part by the Natural Sciences and Engineering Research Council of Canada(NSERC) 

主　　题：Pillar rockbursts Buckling mechanism Stress waves Structural rock mechanics 

摘      要：Rockbursts are sudden and violent rock failures that can lead to huge production and equipment losses,injury or death of mining *** has been regarded as one of the key mechanisms of rockbursts,which are often induced by dynamic loads from mining excavations,such as drilling and blasting in underground *** paper attempts to investigate the dynamic buckling mechanism of pillar rockbursts in underground mining,by considering rockbursts as a dynamic stability problem of underground rock *** results include:(1)A new explanation of the“sudden and violentphenomenon of rockbursts,characterized by exponential growth of the amplitudes of transverse displacement responses,even in the presence of rock damping;(2)Identification of the critical role in inducing rockbursts of dynamic loads that bear frequencies approximately double the natural pillar frequency;(3)The greater influence on rockburst occurrence of the amplitude of dynamic component relative to the static component of loads;and(4)Quantification of the relative effects of stress waveform of dynamic loads on pillar rockbursts,which are in decreasing order if other parameters remain constant:rectangular,sinusoidal,and exponential *** examples are provided and limitations of the approach are *** research is motivated by the on-going and ubiquitous occurrence of rockbursts in underground excavations all around the *** contrast to conventional methods that use rock specimens or rock materials to study rockbursts,this investigation emphasizes the structural effects on rockbursts,which has potential applications in hard rock mining engineering.