Rocky Lane, St Agnes Eco Lodge DevelopmenT​

SWG were appointed ground investigation and geotechnical design engineer for the development of 12 high specification timber lodge houses perched on a mined steep valley side overlooking Trevaunance Cove, St Agnes. The site represents one of the biggest geotechnical challenges in the south west, with major issues including:

• Ground contaminated by both natural and mining processes
• Unrecorded mining voids including adits, shafts and lode stope workings
• Rock slope instability
• Fill slope instability
• Deep foundation requirements

Following detailed investigation, solutions designed to overcome these site specific problems have included:

• Inert capping layers to isolate contaminated fill
• Filling and grouting of worked stopes
• Capping of mineshafts
• Re-profiling fill slopes with geogrid reinforcement
• Supporting new cut slopes with soil nails and shotcrete or proprietary matting
• Supporting unstable rock slopes with anchors and heavy duty meshing
• Rock-socketed piling to support new structures

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Mining features identified from historical records and photographs.

Typical geotechnical works included soil nailing, shotcreting and erosion protection associated with stabilising proposed plot.

Capping of mineshaft