各向异性岩体破坏过程声发射测量及其定位实验研究

Experimental Study on Acoustic Emission Measurement and Source Location for Anisotropic Rock Failure Process

应用改进后的声发射设备,实验测量了花岗岩试样在单轴压缩加载条件下变形破坏过程中声发射现象;讨论分析了该试样损伤破坏过程中的诱发微裂纹相互作用、积累等.同时采用对速度结构依赖较少的相对定位方法,对非均质岩石试验中的声发射事件进行了定位研究.结果表明,相对定位方法可用于复杂试样和工程岩体的声发射事件定位,其可靠性及精度比以往有所提高,能够初步定量分析岩石在外载荷作用下的破坏过程的定位问题,对于工程岩体破坏问题分析具有很好的借鉴意义.

With an improved experimental setup for AE（acoustic emission）, the AE measurement was carried out for the specimens of anisotropic granite in the deformations/failure process under uniaxial compression. Discusses the initiation of microcracks thus induced and their interaction and propagation during damage/failure. A relative source locating method was introduced into the study on the AE occurrences in anisotropic and heterogeneous rock specimens, which is less dependent on sounding wave velocity. The results showed that the method is available to AE occurrences in complex specimens and engineering rock mass with higher reliability and accuracy than before. And it can offer preliminarily a quantitative analysis of locating the source of rock failure process under the action of external loading, thus benefiting the analyses of other failures of engineering rock mass.