Underground concrete pipe crack damage monitoring by the fuzzy analysis of microseism

Abstract Underground concrete pipes are critical for the safety of urban infrastructure. Cracks could lead to accidents such as fluid spillage and ground subsidence, as well as waterlogging. Thus, it is of great significance to measure and monitor the crack of pipeline. In this study, a fuzzy monitoring method for concrete pipe crack damage based on the microseism signal Gaussian Mixed Model (GMM) analysis was proposed. First, the multiple parameters of the microseism signal were extracted. Then, Criteria Importance Through Intercriteria Correlation (CRITIC) weight vector was constructed using the importance information of parameters. Furthermore, the GMM membership matrix was created by the similarity of the probability density distribution. The crack condition was assessed by means of a fuzzy calculation between the weight vector and membership matrix. The experiment indicated that the proposed method can monitor and assess the different crack conditions in real time.