Learnings from Detailed Design of Tunnel Pavements

Paper and Presentation by Chloe Leng from ASCP 4th Concrete Pavements Conference 2017

The recent infrastructure boom in Sydney will provide the city with three new road tunnels by the end of the decade. While the Austroads Guide to Pavement Technology and the various model drawings by state road authorities provide thorough guidelines for the design, maintenance and rehabilitation of highway pavements, guidelines for the design and construction of tunnel pavements are very limited.

The space constraints and associated safety concerns of tunnel paving contribute to unique construction challenges not usually encountered in road pavement design. Space proofing and interface coordination with other disciplines, such as drainage and underground structures, became significant drivers of design.

This presentation will discuss general learnings from the detailed design of tunnel pavements and highlight common issues encountered during the design process. Although all three tunnel projects have adopted continuously reinforced concrete pavement (CRCP), a comparison of key tunnel features across different projects will provide an insight to the advantages and disadvantages of their impacts to pavement design and construction.

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