A thin spry-on liner (TSL) has a higher initial strength, faster construction and higher wa-terproofing performance than the conventional sprayed concrete layer. TSL mainly consists of polymers that have much higher interface adhesion and tensile strength compared with the conventional materials. Despite of the outstanding advantages of TSL, it has not been used or implemented widely in construction sites. In this study, material properties and interface parameters of TSL were evaluated based on the re-sults of laboratory experiments and numerical study. Because the contact behavior of TSL at the interface on concrete is important to understand the supporting mechanism of TSL from tunnel lining implementa-tion, combination of cohesive and damage models was adapted at the interface between TLS and concrete lining in the numerical analysis. From the numerical analysis and laboratory test results, a design method of TSL implementation for the supporting underground structure was proposed.
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