Homebush Bay Rail Link l 700 lineal metres of precast concrete arch l 9 different profiles.8 x 2.5 to 19 x 8 l 900 units. l Reinforced soil with precast concrete facing. l 6 bridges.9,000 Square metres. l Aquatic centre basement walls, 3,000 square metres l 3 different panel types/finishes. l Reinforced soil with steel mesh facing. l 2,000 square metres. l Arch foundations plus basement walls.

Precast Concrete Arches l 2 piece, 3 pinned precast concrete arch system l Advanced design techniques and a flexible moulding system supplies a customised shape and size to suit your needs

Arch Design l Finite Element Analysis l Elasto-plastic soil properties with varying elastic modulus (“Duncan model”); concrete linear elastic l Vertical and horizontal soil pressure and soil structure interaction determined by finite element analysis l Construction sequence modelled in the analysis, including compaction loading l Friction elements to allow slip between soil and arch

Arch Construction l Once the first 4 units are installed, 1 crane can be used for installation

Constraints on Arch Design l Cover over crown of arch l Volume of excavation l Stability under train impact loading l Complex geometry l Waterproofing of the precast joints

Typical Arch Sections

Arch Profiles

Twin Tunnels and the Station

Section Through Twin Arches

Arches supported on steel mesh faced reinforced soil walls

Conclusion l Fast-track design and construct programme l Driven tunnel reduced disruption l Architectural finishes developed in conjunction with architects and suppliers l Precast arch solution to the cut and cover tunnels provided economic and rapid construction without loss of construction flexibility l Design applied principles of Ecologically Sustainable Development l Reinforced soil and arch structures are inherently energy efficient, using soil-structure interaction to utilise the compressive strength of soil

Green concrete at the Homebush Bay Rail Link