Since 2009, Geo-Design have worked as Specialist Advisors to the Clifton Suspension Bridge Trust to assess the existing stability state of the slopes which support the bridge abutments.
Geo-Design’s engineers undertook an initial stability assessment of the 150 year old bridge, using engineering geological models developed from review of published data (recent and historical), detailed mapping of the slopes and a deep drilling campaign. The geological models were digitised and used in state-of-the-art computer analyses to assess the stability state of the foundations and slopes.
Over time the geological models have been updated and verified using geological mapping techniques such as laser scans (LiDAR) and photogrammetric surveys to collect accurate point cloud data. These data have been used to verify and refine the original 2D geological models.
Most recently, as part of Geo-Design’s ongoing role at the bridge, the team have been on site to supervise slope maintenance activities on the Clifton Southwest slope. The project comprised installation of rock bolts and dentition (infilling) of open joints in the rock to preserve the condition of the slope. The works were designed, tendered and supervised by Geo-Design working with COWI.
3D point cloud models of Clifton Suspension Bridge – Southwest Slope