Mechanical behaviour of a sprayed concrete lining isolated by a sprayed waterproofing membrane
Tunnelling and Underground Space Technology
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Nakashimaa, M., Hammer, A., Thewes, M., Elshafie, M., & Soga, K. (2015). Mechanical behaviour of a sprayed concrete lining isolated by a sprayed waterproofing membrane. Tunnelling and Underground Space Technology, 47 152-143. https://doi.org/10.1016/j.tust.2015.01.004
A waterproofing membrane has an important role in a sprayed concrete lined (SCL) tunnel. In this study, the mechanical behaviour of an SCL with a sprayed waterproofing membrane was investigated by laboratory testing. Two different types of tests were performed to examine the behaviour at different parts of an SCL tunnel linings around a tunnel junction. A four-point bending test was conducted to investigate the behaviour of tunnel linings under a large bending moment, which would represent a section near the opening of a tunnel junction. An eccentric compression test was conducted to investigate the behaviour of tunnel linings under a large compressive axial force (hoop stress) and a relatively small bending moment, which would represent a section at the opposite side of the opening of a tunnel junction. Both test results indicate that an SCL with a sprayed waterproofing membrane behaved as a composite section with very limited slip at the interfaces. Designing the primary lining, the waterproofing membrane and the secondary lining of an SCL tunnel as a composite section could have significant practical implications including time and cost savings.
Sprayed concrete lining, Waterproofing membrane, 4-Point bending test, Eccentric compression test
The authors would like to acknowledge the great support offered by technicians at the structural testing laboratory of Ruhr-University-Bochum.
External DOI: https://doi.org/10.1016/j.tust.2015.01.004
This record's URL: https://www.repository.cam.ac.uk/handle/1810/247074