Failure mechanism of different types of shotcrete based on modified Weibull distribution model

Abstract

Many scholars have used the Weibull distribution model to analyze the damage of shotcrete, but it cannot entirely describe the whole process of failure, especially after the peak stress. In this paper, based on the Weibull distribution model modified by the writer with the aim of exploring different mechanical properties of three types of shotcrete, the acoustic emission (AE) technique is used to carry out uniaxial compression tests on different shotcrete, and the failure mechanism of different shotcrete is analyzed according to the AE energy value and cumulative hit counts under loads. The experimental results are consistent with the damage mechanism quantitatively described by the modified Weibull distribution model. This damage model with fewer parameters and simple form, which can quantitatively described the whole process of specimens, including post-peak stress, from the beginning of loading to the complete failure. The research results thus provide a basis for quantitatively describing the damage of shotcrete or rock, and provide a reference for the selection of shotcrete in different engineering environments.