Design and construction carbon reductions for HS2 Station Road Network Rail Overbridge with polymer geogrid reinforced soil wall abutments and wingwalls on shallow foundations
Design and construction carbon reductions for HS2 Station Road Network Rail Overbridge with polymer geogrid reinforced soil wall abutments and wingwalls on shallow foundations
Tensar International Limited was subcontracted by Arcadis Setec COWI (ASC) DJV working for Eiffage Kier Ferrovial BAM (EKFB) JV delivering the design and construction of Britain’s High Speed Rail Main Works Civils Contract C23, to carry out the design of the load bearing bridge abutments and wing walls that will support an overbridge over Network Rail tracks at Station Road. The original concept design comprised reinforced concrete (RC) bridge abutments and L-Shaped wing walls, all founded on piled foundations. The alternative design replaced the piled RC bridge abutments and wing walls with polymer geogrid reinforced soil bridge abutments and wing walls founded on shallow foundations. Coffey Geotechnics Ltd subsequently partnered with Tensar to undertake a comparative assessment of a reinforced soil wall system against the original piled RC retaining system. This paper presents the technical solution eventually adopted by EKFB and a comparison of the embodied carbon related to the two design options. The carbon emissions compared in this assessment includes the embodied carbon at the factory gate for the main materials and carbon emissions associated with transportation, on-site construction activities and waste disposal. The paper also presents cost savings from adopting the alternative retaining system both in design and construction.
Chaido Doulala-Rigby; M. Dalwadi; J. Belton; Michelle Duffy-Turner; R. Blackmore; Georgios Katsigiannis; H. M. B. Al-Hashemi
18th European Conference on Soil Mechanics and Geotechnical Engineering (ECSMGE2024)
E - Environment, water and energy
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