CAN completes slope stabilisation project on M20

August 20, 2021

CAN, an RSK company, has successfully completed a five month slope stabilisation project on the M20 on behalf of VINCI and Taylor Woodrow. The team completed the project, part of the Junction 10a upgrade scheme in Ashford, in September 2019.

The development of a new motorway junction on the M20 in Kent required specialist support from the team at CAN. The newly excavated slip roads and junction needed to be stabilised in order to accommodate the expansion of the motorway network to improve local transport links. Creating one of the new slip roads on the extension involved the excavation of an existing slope that needed to be steepened to 60 degrees and thus required stabilisation work.

CAN excavated the embankment at the site, secured it with soil nails and sprayed concrete across the whole exposed face. The team installed 370 soil nails in total and sprayed 350 tonnes of concrete across the slope face. This process of stabilisation and excavation was conducted in stages and sequenced to work alongside the earthworks on the site. The team was able to utilise a 25-tonne zero tail swing excavator to “seamlessly spray and drill” with the same machinery, making efficient use of its time on site. Having removed the drilling rig and fitted a “remote-controlled shotcrete excavator attachment”, the team was able to spray the concrete facing as required while minimising the potential for delays.

After successfully installing the soil nails and concrete facing, the slope was further reinforced with a bespoke gabion facing, designed and constructed by the CAN team. This facing had the added benefit of improving the aesthetic appearance of the project. The gabion facing comprised a layer of welded mesh reinforcement with a drainage system over the concrete face, with the addition of wire mesh gabion facing filled with locally sourced stone on top.

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