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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。
Through the acoustic emission tests of five kinds of rock samples under uniaxial compression failure, the relationship between acoustic emission characteristics, stress, strain and acoustic emission, stress, acoustic emission and time are studied. It is found through experiments that the rock produces acoustic emission events in the whole process of uniaxial compression failure. The characteristics of acoustic emission events are related to the rock strength, the degree of tightness and the development degree of the tectonic plane. The acoustic emission before rockfall There are three typical types of correlations between the number of events, stress, strain and time. The acoustic emission event rate of some rock samples obviously decreases immediately before the destruction, and the precursor phenomenon of rock failure can be used to explain the rock During the on-site monitoring of body acoustic emission, anomalous acoustic emission events will occur before the roof fall, rock formation and rock burst occur, which plays an important guiding role and application value in monitoring and predicting the stability of the rock mass project and improving the forecast accuracy.