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《Journal of University of Science and Technology Beijing》 2009-01
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Rock fatigue damage evolution based on acoustic emission

XU Jiang,LI Shu-chun,TANG Xiao-jun,TAO Yun-qi,YANG Hong-wei Key Laboratory of the Ministry of Education of China for Exploitation of Southwestern Resources & Environmental Disaster Control Engineering,Chongqing University,Chongqing 400044,China  
Acoustic emission(AE) characteristics of a sandstone sample in fatigue failure process were analyzed by AE testing and its fatigue damage evolution rule was studied.Based on the AE characteristics and the damage evolution rule,in consideration of the three-stage rule of irreversible deformation development of rock, the whole fatigue process can be divided into four stages.Fatigue damage failure of rock has the burst characteristic,and the damage accelerates to evolve in the failure stage.Experiment results show that,if rock's fatigue failure is monitored and forecasted by AE,it enters into the failure stage when the damage amount is about 0.4 and into the disabled stage when the damage amount is about 0.3,respectively.
【Fund】: 国家自然科学基金资助项目(No.50574108);; 教育部博士点基金资助项目(No.20060611006);; 国家自然科学基金重点资助项目(No.50534080)
【CateGory Index】: TU458.3
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