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应变型岩爆过程的声发射特征研究
Experimental Study of Acoustic Emission Characteristics of Strainburst
投稿时间: 2017-04-08  最后修改时间: 2017-08-09
DOI:
中文关键词:  岩石力学  真三轴试验  岩爆  板裂  声发射
英文关键词:rock mechanics  true-triaxial test  rockburst  splitting  acoustic emission
基金项目:国家自然科学基金资助项目(41472329,51369007)
作者单位E-mail
张洁 广西大学 1406202933@qq.com 
苏国韶 广西大学土木建筑工程学院 suguoshao@163.com 
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中文摘要:
      采用真三轴岩爆试验系统开展岩石力学试验,在室内再现了花岗岩的应变型岩爆破坏、板裂破坏、真三轴剪切破坏三种破坏过程。研究表明,与板裂破坏、真三轴剪切破坏不同,在整体破坏前夕,岩爆破坏存在明显的声发射撞击数相对“平静期”;三种破坏的声发射撞击数分形维数Dt都存在整体破坏前夕持续下降到极小值点而破坏瞬间突增的现象,但岩爆破坏在整体破坏前夕的Dt持续降低速率和整体破坏瞬间Dt增幅上都比板裂破坏的大;三种破坏过程的声发射信号的主频值呈“低频-高频-低频”的总体演化趋势,频谱形状经历“单峰-多峰-单峰”的交替变化过程,但在岩样破坏的塑性阶段,三种破坏在主频分布及信号幅值上有明显差异。
英文摘要:
      Rock mechanics tests were conducted using a true-triaxial rockburst testing system. Three failure processes including rockburst, splitting, and shear of granite were reproduced. Different from the splitting or shear failure process, a relative “quiet period” of AE hits can be observed during rockburst process. The time-based fractal dimension Dt of AE hits continuously decreases to a minimum before overall failure and uprush when overall failure occurs during all failure processes. However, the decreasing rate of Dt before overall failure is greater and the amplification of Dt at the moment of overall failure is larger in rockburst process than splitting failure process. The dominant frequency of AE signals evolves from low frequency to high frequency, and then to low frequency, and the spectrum experienced the repeated variation of single peak, multiple peak, and single peak in all rock failure processes. But, there are significant differences in dominant frequency distribution and signal amplitude during the plastic stage of three kinds of rock failure.
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