The 2.5 mile (4.1km) Barton Hartshorn to Mixbury cutting, near Brackley, will be the project's longest cutting with 1.3 million cubic metres of material set to be excavated in stages over the next three years.
Almost 28,000 jobs are currently supported by the HS2 project, which is designed to improve transport links between London, the Midlands and the North and boost growth across the UK.
Running across the boundaries between Buckinghamshire and Oxfordshire, the cutting will be up to 11m deep and will be crossed by six road, foot and bridleway bridges in order to keep communities connected.
Material from the excavation will be reused elsewhere on the project to help create embankments, noise barriers and landscaping. Sourcing these materials on site also helps to reduce the number of lorries on local roads.
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HS2 Ltd's Project Client, Rohan Perin, said: "Construction is now well under way across the whole first phase of the HS2 project, with almost 28,000 jobs now supported across the UK and our initial earthworks made good progress over the summer. Some of the longest cuttings will be in Buckinghamshire and Oxfordshire, reducing noise and visual impact for local residents while carrying the new high speed line under a series of road and railway bridges. It’s great to see a strong start to work on site."
Excavation also recently started at the nearby Calvert cutting, which will take the line for 2.1 mile (3.4km) past the Buckinghamshire villages of Calvert Green and Steeple Claydon, roughly following the route of the disused Great Central Railway, which closed in the 1960s.
The cutting will take the line under four road bridges and the new East West Rail route, which is also currently under construction.
Around 685,000 cubic metres of material will be excavated to create the Calvert cutting which will be up to 9.7m deep and wide enough to allow extra local railway lines to be added alongside the HS2 main line at a later date. Other major cuttings, at Turweston in Northamptonshire, Waddesdon in Bucks, and Ladbroke, in South Warwickshire, are also well under way.
Construction of the two cuttings is being led by HS2's main works contractor, EKFB – a joint venture between Eiffage, Kier, Ferrovial Construction and BAM Nuttall.
