岩石单轴压缩破坏声发射特性试验研究

通过5种岩石试样的单轴压缩破坏全过程的声发射试验,研究了不同岩石受力变形的声发射特性,应力、应变与声发射的关系,应力、声发射与时间的关系。通过试验发现,岩石在单轴受压破坏全过程中都会产生声发射事件,声发射事件的特性与岩石的强度、质密程度、构造面的发育程度等有关;岩石在峰值破坏前的声发射事件数、应力、应变和时间之间的相互关系呈3种典型的类型;部分岩石试样在临近破坏前,其声发射事件率出现明显下降,这种岩石破坏的前兆现象可以用来解释岩体声发射现场监测时,在冒顶、片帮和岩爆等发生前会出现声发射事件反常现象,这对岩体工程稳定性监测预报、提高预报的准确性具有重要的指导作用和应用价值。

Experimental Study on Acoustic Emission Characteristics of Uniaxial Compressive Rock Failure

Based on uniaxial compression acoustic emission test for 5 kinds of rock sample,the acoustic emission characteristics about different rock deformation are studied,as well as the relationship between stress,strain with acoustic emission,and the relationship between the stress,acoustic emission with time.The test shows that,the acoustic emission events exist during the whole process of uniaxial compression damage,and the characteristics are related to the strength,compact degree and development of structural surface;the relationship between the acoustic emission events,and stress,strain with the time before the peak failure of rock shows 3 kinds of typical types;the acoustic emission rate of some rock samples decreased significantly before failure,this precursory phenomena can be used to explain the acoustic emission abnormal phenomenon before the roof caving,rib spalling and rock burst in field monitoring.It has great guiding functions and application values for monitoring,predicting and improving the accuracy of rock engineering.