关键词: 硬岩破裂; 声音信号; 声谱图形; 高斯过程分类;

Abstract: To further reveal the mechanism of rock cracking, a tensile/shear crack recognition method based on the characteristics of spectrograms was proposed.The representative tensile and shear sound signals were collected from the Brazilian disc splitting test and the direct shear test respectively.Then the sound signals were drawn into spectrograms.The local binary pattern indicator and the color moment indicator were used as characteristic index to distinguish spectrograms.Thus a tensile/shear crack recognition method based on Gaussian process classification was established.The method was applied to investigate the tensile and shear crack development of granite during biaxial compression test, proving that the proposed method was applicable and convenient.

Key words: hard rock cracking; sound signal; spectrograms recognition; Gaussian process classification;