Project Description
Transport for NSW’s M6 Stage 1 project features twin 4km tunnels linking the M8 Motorway at Arncliffe to President Avenue at Kogarah. The works involve complex roadheader tunnelling through varying geology, the construction of a dive portal structure, and upgrades and tie-ins to existing road infrastructure.
– 4km twin road tunnels
– Excavation:
– Roadheaders in Hawkesbury Sandstone
– Excavators in sands and clay with jet-grouting treatment
– 125m open cut + 230m cut & cover excavation (with top-down construction method)
– 2 caverns: section up to 267m²
– 3-lane tunnels: section up to 182m²
– 27 cross passages
