A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Rapid and economical evaluation of concrete tunnel linings with impulse response and impulse radar non-destructive methods
Concrete tunnel linings, whether pre-cast or cast in place, are designed to distribute external soil pressures as uniformly as possible through the tunnel shell. To this effect, the contact between the lining and the surrounding soil is usually assured by grouting the annular space between. Any voiding in the grout at this interface negates the purpose of the grout. This paper describes the use of non-destructive testing to examine the efficiency of tunnel lining grouting programmes, with particular emphasis on results obtained by the impulse response and impulse radar methods. The rail, water supply and sewer tunnels discussed in this article vary in diameter between 1 and 5 m, and emphasis is placed on the rapid results obtained by these methods. The impulse response method is a rapid and effective test method for the evaluation of pre-cast or cast-in-place tunnel linings and their support quality, as demonstrated by the case histories in this article. In addition to the examples presented here, the method is presently in use for the detection of voiding in the grouted support to pre-cast lining units in metro tunnels under construction in Denmark, and is proving to be a very rapid and successful control technique.
Rapid and economical evaluation of concrete tunnel linings with impulse response and impulse radar non-destructive methods
Concrete tunnel linings, whether pre-cast or cast in place, are designed to distribute external soil pressures as uniformly as possible through the tunnel shell. To this effect, the contact between the lining and the surrounding soil is usually assured by grouting the annular space between. Any voiding in the grout at this interface negates the purpose of the grout. This paper describes the use of non-destructive testing to examine the efficiency of tunnel lining grouting programmes, with particular emphasis on results obtained by the impulse response and impulse radar methods. The rail, water supply and sewer tunnels discussed in this article vary in diameter between 1 and 5 m, and emphasis is placed on the rapid results obtained by these methods. The impulse response method is a rapid and effective test method for the evaluation of pre-cast or cast-in-place tunnel linings and their support quality, as demonstrated by the case histories in this article. In addition to the examples presented here, the method is presently in use for the detection of voiding in the grouted support to pre-cast lining units in metro tunnels under construction in Denmark, and is proving to be a very rapid and successful control technique.
Rapid and economical evaluation of concrete tunnel linings with impulse response and impulse radar non-destructive methods
Schnelle und preiswerte zerstörungsfreie Untersuchungsmethoden für Betontunnelauskleidungen mit Impulsantwort und Impulsradar
Davis, A.G. (author) / Lim, M.K. (author) / Petersen, C.G. (author)
NDT&E International ; 38 ; 181-186
2005
6 Seiten, 6 Bilder, 5 Quellen
Article (Journal)
English
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