The NSW Government granted permission to BHP Billiton to extract coal by longwall mining at their Appin West Colliery. The longwalls extend beneath the Hume Highway and Main Southern Railway, north-east of Douglas Park. The highway carries more than 37,000 vehicles a day at speeds up to 110 km/h. The Main Southern Railway carries XPT services at 125 km/h as well as local trains. Some areas of the highway are expected to subside by up to 1.5 m.
PSM was engaged to assess and monitor potential movement along geotechnical structures, closure slots within the Hume Highway pavement and joint monitors on the Douglas Park Bridge.
The impact and scale of potential disruptions attracted a high level of public interest of this main road infrastructure between Sydney and Melbourne.
Engineering and technical opportunities included:
Following a rigorous site investigation and ground model development, PSM’s innovations included:
Premier’s Award 2011
Successful development of an award-winning tailored monitoring system which fulfilled the client’s requirements.
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