Abstract：Based on acoustic emission(AE) locating technique and single-link cluster(SLC) method，the experimental study of change characteristic of spatial correlation length of AE events during the fracture process of rock specimens under uniaxial compression is conducted. The color separation of AE events by link¢s length distribution of SLC frame can be used to study the cluster concentration degree of AE events. The results show that the two factors influencing the change in spatial correlation length are as follows：stress release，which leads correlation length to decrease，and stress field transferring，which leads correlation length to increase. According to the changes in spatial correlation length，the rock specimens can be classified into three types：(1) the specimens show no significant plastic deformation before failure. The spatial correlation length of AE events present a trend of accelerate growth which features as power law. It reaches the maximum value before rock failure. (2) The specimens show remarkable plastic deformation before failure. In plastic deformation stage，the spatial correlation length can either increase or decrease which depends on combination of the two above mentioned factors. (3) The specimens show clear cracking localization during loading. The spatial correlation length shows a sharp decrease when macro cracks generate. The link¢s count in SLC frame shows fractal characteristics. It can reflect the spatial evolutional process of AE events，which is consistent with the results acquired by spatial correlation length. The increase in spatial correlation length reflects the long-range transfer of stress field process. The difference between spatial correlation length and its previous value during the plastic phase has important significance for predicting rock failure.
刘建坡，李元辉，田 军，赵兴东，刘洪涛，甘怀营. 基于单键群方法的岩石破裂声发射时空分布特征的试验研究[J]. 岩石力学与工程学报, 2010, 29(S2): 3488-3497.
LIU Jianpo，LI Yuanhui，TIAN Jun，ZHAO Xingdong，LIU Hongtao，GAN Huaiying. EXPERIMENTAL STUDY OF TEMPORAL AND SPATIAL DISTRIBUTION CHARACTERISTICS OF ACOUSTIC EMISSION DURING ROCK FRACTURE BASED ON SINGLE-LINK CLUSTER METHOD. , 2010, 29(S2): 3488-3497.
2010, Vol. 29 
