岩土工程学报2016，Vol.38Issue(z2)：336-341,6.DOI:10.11779/CJGE2016S2055
岩石拉伸破坏机制与应力波谱特征
Damage mechanism and stress wave spectral characteristics of rock under tension
摘要
Abstract
The tensile property of rock is much worse than its compression performance, and the damage mechanism under tension determines the stability and safety of rock engineering. To study the tensile damage mechanism of rock, the vibration theory and acoustic emission (AE) signal tests under indirect tensile conditions are used to analyze the damage evolution process of granite. The tensile damage mechanism is obtained by using the fractal theory and the distribution of dominant frequencies and energies of AE signals. Based on the distribution of AE events, damage is instantaneous and the number of AE events sharply increases when the loading stress reaches its ultimate tensile strength (UTS), reflecting apparently brittle performance. The fractal dimension of AE events decreases as the loading stress increases. The dominant frequencies of AE signals at the indirect tensile stage are mainly concentrated at 175~250 kHz and 50~100 kHz. Their energies are intensively distributed in the band width of 0~312.5KHz. The stress wave characteristics and fractal mechanism can reflect the basic mechanical property of rock. They are of important experimental and theoretical significance for further studies on rock performance and enhancing the safety of rock engineering.关键词
岩石/拉伸/损伤机制/应力波/主频/能量Key words
rock/tension/damage mechanism/stress wave/dominant frequency/energy分类
建筑与水利引用本文复制引用
张伯虎,刘玮丰,邓建辉,刘建锋..岩石拉伸破坏机制与应力波谱特征[J].岩土工程学报,2016,38(z2):336-341,6.基金项目
水力学与山区河流开发保护国家重点实验室开放基金项目（SKHL1424）；博士后基金项目 （）
