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Event Organiser: ICE

Slope Stabilisation on the A465 Heads of the Valleys Section 2, webinar

  • Webinar
  • Online
  • 23 September 2021
  • 13:00 - 14:00
Slope Stabilisation on the A465 Heads of the Valleys Section 2, webinar

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South Wales is one of the most complex areas in the UK for geotechnical works, with numerous geological hazards, anthropogenic hazards and environmental challenges. These complexities make both the design and installation of geotechnical works challenging, particularly where the A465 passes through the steep sided valley of the Clydach Gorge.

The A465 Heads of the Valleys Section 2 project focused on the 8km stretch of road from Gilwern to Brynmawr, and forms part of a larger Welsh Government scheme to install a dual carriageway over a total of 40km of the A465 between Hirwaun and Abergavenny.

Costain began construction on site in January 2015, with BAM Ritchies becoming involved in 2016. Over the course of the next year, BAM Ritchies installed over 3,700 soil nails and rock bolts across three separate slopes on the project. Ground conditions quickly proved complex, with variable levels of glacial till overlying rockhead and boulders within the till causing complications during excavation.

The presentation will highlight the combination of drilling methods and techniques that BAM Ritchies utilised to overcome the challenges and successfully deliver the works which also included the installation of Deltax, Greenax & Maccaferri meshes.


Hollie Colville

Hollie Colville

Hollie joined BAM Ritchies in 2016 and completed a year’s placement as part of the Engineering Geology & Geotechnics degree at the University of Portsmouth. Following graduation in July 2018, she returned full time to BAM Ritchies Geotechnical Division and began work as an Assistant Geotechnical Engineer on a range of projects. This included piling works at the M25 / A2 intersection, void remediation grouting works & several slope stabilisation schemes in the South Wales area.

Hollie has since progressed to Geotechnical Engineer and more recently has been managing several soil nailing and rock bolting schemes on various railway cuttings in the South of England.

Event venue

United Kingdom

For more information please contact:

Felicity White

e: [email protected]