Abstract

A thin spry-on liner (TSL) has a relatively higher initial strength, faster construction time and higher waterproofing performance than the conventional sprayed concrete linings. TSL mainly consists of polymers and its supporting potential is from the adhesion at the interface and tensile strength which is distinct from the conventional method such as the shotcrete. However, TSL is not a well-known material even recently highly in demand due to its outstanding properties. In this study, to evaluate material properties and interface parameters of TSL, laboratory experiments and numerical study were carried out. Because the contact behavior of TSL at the interface is important parameter to understand the supporting mechanism of TSL, two contact models, i.e. combination of cohesive and a damage model, was adopted at the interface in the numerical analysis. From the analysis and laboratory tests, a possible design method of TSL for the supporting material was proposed in this study.

1. Introduction

Thin Spray-on Liner (TSL) has a relatively higher initial strength, faster construction time and higher waterproofing performance than the conventional sprayed concrete linings. Construction thickness of TSL is generally known as 3–5 mm and 10 mm of maximum value (EFNARC, 2008). Although TSL has waterproofing and supporting ability, it is hard to use at a compressive structure such as an arch-type structure of tunnel due to its thin thickness (Povin et al., 2004). Thus it is recommended to be applied with combinations of TSLs and conventional spray supports (i.e., shotcrete), if the target structure is expected to be experienced the compressive force (Dirige and Archibald, 2009).

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