> Project Design

The key changes to the tunnel alignment from the reference project include:

 relocating the east-west tunnels at Lutwyche and Wooloowin to accommodate changes to the design of surface connections
 increasing the depth and length of the east-west tunnels
 reducing the depth of the north-south tunnel to allow construction access from a shared worksite with the Northern Busway at Truro Street
 avoiding cut and cover tunnel through much of Lutwyche Road, the Department of Emergency Services and Kedron State High School
 changing properties affected by volumetric tenure, particularly in Lutwyche and Wooloowin.

The Changed Project is now available for community comment.


What will the Project include?

The Airport Link Changed Projectis approximately 6.7km long, including about 5.3km of tunnels between Bowen Hills and Clayfield.

It includes:


Surface connections

The Airport Link Changed Project includes surface connections at Bowen Hills/Windsor, Lutwyche/Kedron and Clayfield/Toombul.

Bowen Hills/Windsor connection

The Bowen Hills/Windsor connection includes links to the Inner City Bypass, the North South Bypass Tunnel and the city and Fortitude Valley via Campbell Street and Lutwyche Road.

Key changes to the Bowen Hills/Windsor connection from the reference project include:

A detailed map of the Changed Project can be found here.


Kedron/Lutwyche connection

The connection at Kedron/Lutwyche includes links to and from Gympie Road and Stafford Road, and from Lutwyche Road to travel east to Toombul.

Key changes to the Kedron/Lutwyche connection from the reference project include:

A detailed map of the Changed Project can be found here.


Clayfield/Toombul connection

The connection at Clayfield/Toombul includes links to and from Sandgate Road and the East-West Arterial.

Key changes to the Clayfield/Toombul connection from the reference project include:

A detailed map of the project reference design can be found here.


How will Airport Link be built?

Tunnel construction for Airport Link will involve a combination of driven tunnelling (underground tunnelling using a tunnel boring machine or roadheader) and cut and cover construction near surface connections, where the tunnel is close to the surface.

Drilling and blasting would also be necessary in some areas with hard rock or where particularly difficult conditions exist.

Key changes to tunnelling from the reference project include:


Construction work sites

Construction worksites are proposed at Windsor, Lutwyche/ Kedron and Clayfield/ Toombul. Access to the construction work sites is generally via major roads to avoid disrupting residential streets.

The construction worksites generally incorporate a range of measures to reduce construction impacts, such as noise and dust.

The key changes to the construction worksites from the reference project are outlined below.

Bowen Hills/Windsor

Lutwyche/Kedron

Clayfield/Toombul


Spoil removal

Approximately 2.8 M bank cubic metres (bcm) of spoil (rock and soil) will be removed during construction of the tunnels of the Airport Link Change Project. This is higher than the amount of spoil expected from the construction of the reference project, due to more driven tunnelling and burying the ventilation stations.
 
Approximately 340,000 bcm of spoil will be reused on site, including for the backfill of cut and cover tunnels, retaining walls and other earth bearing structures.

A further 520,000 bcm of spoil from TBM construction is proposed to be transported by conveyor, avoiding the need for approximately 80,000 truck movements.

Approximately 1.95 M bcm of spoil will be transported by truck, resulting in approximately 300,000 truck movements.

Spoil removal from work sites could occur 24 hours a day during the week and 12 hours a day on Saturday (i.e. 6.30am Monday to 6.30pm Saturday). This would allow truck haulage outside peak hours. Spoil haulage would not occur on Sundays or public holidays.

The following key changes to spoil removal from the reference project include:


How long will construction take?

The Airport Link Changed Project would take about 45-month to construct, with completion anticipated for late 2012.


Geotechnical studies

Geological testing within the study corridor has been undertaken to help the project team gain an understanding of the soil and geology within the study corridor.

Geotechnical testing was undertaken during the development of the reference project, which included more than 50 boreholes. This included an assessment of the potential impacts on properties over the proposed path of the Airport Link tunnels.

The geology of the tunnel alignment includes a combination of Tingalpa Formation, Brisbane Tuff, Neranleigh Fernvale Beds, Aspley Formation and alluvium.

Appropriate tunnelling has been selected for the different material.