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http://dx.doi.org/10.9711/KTAJ.2013.15.6.571

An experimental study on bonding and bearing capacities of thin spray-on liner to evaluate its applicability as a tunnel support member  

Han, Jin-Tae (Geotechnical Engineering Research Division, Korea Institute of Construction Technology)
Lee, Gyu-Phil (Geotechnical Engineering Research Division, Korea Institute of Construction Technology)
Park, Young-Taek (Geotechnical Engineering Research Division, Korea Institute of Construction Technology)
Choi, Soon-Wook (Geotechnical Engineering Research Division, Korea Institute of Construction Technology)
Hwang, Gwi-Sung (SILKROAD T&D)
Choi, Myung-Sik (SILKROAD T&D)
Chang, Soo-Ho (Geotechnical Engineering Research Division, Korea Institute of Construction Technology)
Publication Information
Journal of Korean Tunnelling and Underground Space Association / v.15, no.6, 2013 , pp. 571-583 More about this Journal
Abstract
The use of Thin Spray-on Liner (TSL) as an alternative to shotcrete has drastically increased since 1990s when it was first developed and introduced to mines. In this study, tensile strength test, bond strength test, compression test with specimens coated by TSL, and two kinds of bending tests proposed by EFNARC (2008) were performed with two kinds of TSLs with different material compositions in order to evaluate their support capacities. As a result, both TSLs were shown to be satisfactory for the minimum performance requirements for a structural rock support suggested by EFNARC (2008) and tensile strength of a TSL was shown to increase as its content of polymer was higher. In contrast, its bond strength was shown to increase proportional to the content of a cementitious component especially at the early age.
Keywords
Thin spray-on liner; Polymer; Bearing capacity; Bonding; Tensile strength;
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