Full scale testing of rebar and SFRC segmental lining using independent and wireless instrumentation systems.
Development and acceptance of steel fibre reinforced concrete (SFRC) segmental tunnel lining requires an accurate understanding of the performance of the SFRC segments under real load conditions. An innovative instrumentation scheme has been implemented during the construction of the Liantang Lung Shan highway tunnels in Hong Kong to evaluate the distribution of the loads in the segments during erection and tunnelling and for comparison with the design assumptions obtained by numerical simulations. The monitoring system used embedded microelectronic technology and was designed to be independent and wireless allowing data to be collected throughout the full lining erection process. The instrumentation program included 10 segments, both conventionally and steel-fibre reinforced. This paper will present the development of the instrumentation, the installation methods and initial data obtained.
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