Staged construction of surcharged embankments over peat for a national road in Co. Donegal, Ireland
Kissane, Paul Ward, F. J. McCabe, Bryan A. Fattahi Masrour, Farimah Towey, F.
Kissane, Paul
Ward, F. J.
McCabe, Bryan A.
Fattahi Masrour, Farimah
Towey, F.
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Publication Date
2024-08-26
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Type
conference paper
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Citation
Kissane, P., Buggy, F. J., Ward, G., McCabe, Bryan A., Fattahi Masrour, F., & Towey, F. (2024). Staged construction of surcharged embankments over peat for a national road in Co. Donegal, Ireland: Construction etagé pour des remblais surchargés sur des sols tourbe pour un route national à Donegal en Irlande. Paper presented at the ECSMGE 2024 XVIII European Conference on Soil Mechanics and Geotechnical Engineering, Lisbon, Portugal, 26-30 August.
Abstract
The paper describes innovative geotechnical methods to implement staged construction of surcharged embankments up to 5.5 m high on very soft blanket peat soils in north west Ireland. Shear wave velocities, CPT ball tests and direct simple shear tests were used to assess the undrained strength of the peat. Intermediate hold periods and consolidation benefits were exploited to optimise the filling schedule. Changes to instrumentation, basal reinforcement, anchorage detailing and filling rates were implemented to assure stability. Detailed interpretation of settlement and pore pressure responses during loading and unloading at instrument clusters is presented, including back-calculated field coefficients of consolidation and observed deformation ratios.
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Publisher
ECSMGE24
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Attribution-NonCommercial-NoDerivatives 4.0 International