Study on the coupled relationship between AE accumulative ring-down count and damage constitutive model in soil unconfined compression test

Indoor acoustic emission tests can be used to obtain acoustic emission characteristics and damage evolution rules under uniaxial compression conditions during the damaging process of soil body. Soil damage is characterized by ringing acoustic emission count by analyzing the variation relation between AE parameters and stress. The results show that the acoustic emission distribution can be classified into 3 different stages. Starting from the time domain, the coupling relation between the cumulative acoustic emission ring-down count and strain is derived, which is based on the time parameter as an intermediate variable. Further, the coupling relation between the cumulative acoustic emission ring-down count and stress and damage is deduced, which is based on distribution of the Weibull damage constitutive model. Results indicated that theory curves and test dates matched well. Proved by the test data, the precision of constitutive model is higher, which can provide accurately the basis for soil damage assessment.