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Título

QUALITY SURVEY OF SHOTCRETE FOR ROCK TUNNEL SUPPORT BY NDT METHODS

Resumo

The use of a shotcrete layer is a common solution for underground excavations in rock masses, being used even to stabilize the excavation as a final layer of the constructed tunnel. The shotcrete has an important role supporting loose blocks. The load bearing capacity of this structural system depends on variables with large uncertainties incorporated. To verify the quality and reliability of this structural system several destructive testing’s are carried out during the tunnel construction to verify its layers thickness, adherence and mechanical properties. This paper discusses the applicability of Non-destructive testing to improve the shotcrete quality survey, showing a real case study with real application of ground penetration radar and impact eco to estimate de concrete thickness, rebar covering and shotcrete adherence, and discussing the applicability of the methods.

Palavras-chave

non-destructive testing; quality control; impact echo; ground penetration radar; GPR

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