Dowgas Mining Subsidence, Cornwall, UK

Synopsis:
Site investigation, risk analysis, shaft stabilisation, track formation stabilisation, permanent way design
Contractor:
Carillion (formally Alfred McAlpine Capital Projects) under the GWESPA alliance
End Client:
Network Rail
Award:

A remediation scheme was required to stabilise ancient mine workings on a railway line between Probus and Burngullow in Cornwall.

Tony Gee was appointed to examine the feasibility of various options for stabilising the new double track alignment over the mine. The favoured option was to install a heavily reinforced concrete slab below the ballast that is capable of supporting the worst credible subsidence condition.

Tony Gee’s appointment continued with the detailed design. This included temporary and permanent track alignment to tie into the overall redoubling scheme, enabling work to be switched from one track alignment to the other under a tight programme using short possessions.

The design significantly reduced safety and environmental risks whilst eliminating the risk of project overrun.

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Dowgas Mining Subsidence