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A40 Brecon Bypass landslide: investigation, remediation and asset management

Event organised by ICE

27 October 2022

This event has now ended

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Between 15-16th February 2020, a 300m3 failure of part of the westbound A40 Brecon Bypass cutting occurred, leading to the initial closure of all four lanes of the dual carriageways.

The slope failure took place during a month in which Wales was impacted by three named storms, record-breaking rainfall and associated widespread flooding.

The presentation will cover the approach to management of geotechnical risk for the scheme, from desk study through implementation of an on-slope ground investigation and interim risk mitigation, to design and implementation of the remedial measures. The talk will describe the nature and trigger of the failure, the site constraints that were overcome during the site works and finally measures taken to manage residual risk and ensure ease of maintenance.


For more information please contact:

Eleanor Kelman