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岩石是典型的非均匀脆性材料,其内部富含各种缺陷(微裂纹、空隙、节理裂隙等),在受载破裂过程中会产生大量的声发射信号。对含不同预制裂纹及完整岩样进行单轴压缩实验,应用声发射仪器及其盖格尔(Geiger)定位算法对岩样破裂过程的裂纹扩展过程进行实验验证。实验结果表明:在单轴压缩加载条件下,含预制裂纹的岩样发生剪切破坏;完整岩样发生劈裂破坏。声发射事件的定位达到较高的精度,很好地反映了岩样内部微裂纹孕育、萌生、繁衍和扩展的三维空间演化模式,不论是含裂纹还是完整试样的声发射定位结果与实际破坏模式非常吻合,这为研究岩石破裂失稳机理提供有力的工具。
Rock is a typical non-uniform brittle material, its internal rich in various defects (micro-cracks, voids, joint cracks, etc.), in the process of load-bearing rupture will produce a large number of acoustic emission signals. Uniaxial compression experiments with different prefabricated cracks and intact rock samples were carried out. The acoustic emission apparatus and its Geiger localization algorithm were used to verify the crack propagation in the rock samples. The experimental results show that under the uniaxial compression loading, the rock specimens containing prefabricated cracks occur shear failure and the intact rock specimens undergo splitting failure. The location of the acoustic emission event reaches a higher accuracy, which well reflects the three-dimensional spatial evolution mode of inoculation, initiation, propagation and expansion of microcracks in the rock specimen. The results of acoustic emission localization and actual damage of cracked or intact samples Mode is very consistent, which provides a powerful tool for studying the mechanism of rock failure and instability.