The Jamuna river crossing represents one of the most challenging projects in bridge design and construction. The project was threatened by large-scale liquefaction flow slides within the underwater slopes of the guide bunds. The river sediment comprises a 70m thickness of loose micaceous sands which are highly susceptible to liquefaction on both static and dynamic loading.
GCG’s role was to advise on the design of the underwater slopes following catastrophic failures during construction. This required an extensive programme of laboratory testing and characterization of the alluvial materials.
The work was followed by advice on the river protection scheme to the north of the bridge site, where similar conditions and problems were being encountered.