Study on tensile property of thin spray-on liner based on fractal characteristics of pore structure

Abstract

The thin spray-on liner (TSL) presents as a composite of considerable promise for application in mining and tunnel engineering domains. It serves not only to support the rock mass but also to inhibit the oxidation of both rock bolts and wire mesh. The tensile property of TSL plays a crucial role in governing the design and performance of support systems. And the macroscopic tensile properties of TSL mainly depends on the micro-pore structures. Thus, this study utilized porosity as an intermediary to develop a predictive model for the effective tensile strength of TSL based on fractal characteristics of pore structure. First, dual fractal dimensions were utilized to construct the a relation model of the fractal dimensions of pore structures and porosity. Subsequently, the quantitative relationship between the effective tensile strength and porosity was constructed by applying the TSL equivalent central pore model. Following this, by incorporating porosity as an intermediary, a predictive model was constructed for the tensile strength of TSL based on the dual fractal dimensions. The established models were finally employed to predict both porosity and effective tensile strength. The results demonstrate a good fit between the measured values and the predicted values, indicating the model’s reliability.