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Mechanical behaviour of a sprayed concrete lining isolated by a sprayed waterproofing membrane
Graphical abstract Display Omitted
Highlights The mechanical behaviour of a SCL with a sprayed waterproofing membrane was examined. Laboratory tests were designed to simulate the conditions of a tunnel junction. Compound behaviour was observed both macroscopically and microscopically.
Abstract 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.
Mechanical behaviour of a sprayed concrete lining isolated by a sprayed waterproofing membrane
Graphical abstract Display Omitted
Highlights The mechanical behaviour of a SCL with a sprayed waterproofing membrane was examined. Laboratory tests were designed to simulate the conditions of a tunnel junction. Compound behaviour was observed both macroscopically and microscopically.
Abstract 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.
Mechanical behaviour of a sprayed concrete lining isolated by a sprayed waterproofing membrane
Nakashima, Masanari (author) / Hammer, Anna-Lena (author) / Thewes, Markus (author) / Elshafie, Mohammed (author) / Soga, Kenichi (author)
Tunnelling and Underground Space Technology ; 47 ; 143-152
2015-01-02
10 pages
Article (Journal)
Electronic Resource
English
Mechanical behaviour of a sprayed concrete lining isolated by a sprayed waterproofing membrane
| Online Contents | 2015
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Online Contents | 1997