Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Design and Performance of Low Capacity Roads on Peat Foundation Soils in Ireland
https://orcid.org/https://orcid.org/0000-0003-3515-9380
https://orcid.org/https://orcid.org/0000-0002-1809-7096
Peat soils exhibit very high organic and moisture contents with corresponding very high compressibility and creep characteristics and very low strength. These poor engineering properties make peat soils particularly unsuitable as a foundation material for road pavements with attendant high risks of instability during both initial construction and in service with unpredictable and often excessive long-term deformations. Almost 20% of Ireland is peatland and roads have been historically constructed directly on peat, albeit with mixed results and often high, long-term maintenance costs. Ground improvement by means of excavation and replacement of peat is frequently adopted and more recently piled embankments are increasingly used in areas of deep peat deposits in Ireland for major roads. However, these mitigation measures can have high construction costs and attendant risks as well as large resultant waste volumes and environmental sustainability impacts. The paper briefly reviews the historical approaches to road construction in peat soils both in Ireland and internationally. Analytical methods to assess flexible pavement foundation stability and deformation under static embankment and dynamic traffic loading are reviewed. A number of case histories of low capacity (less than 2000 AADT) road foundation design and performance on Irish peat soils are described. The benefits of surcharge upon the creep performance of peats are discussed and back calculated, and field performance data from one site is presented. Some conclusions are drawn as to the potential for increased application of geosynthetic base reinforcement and ground improvement approaches in peat soils which are less commonly adopted at present in Ireland.
Design and Performance of Low Capacity Roads on Peat Foundation Soils in Ireland
https://orcid.org/https://orcid.org/0000-0003-3515-9380
https://orcid.org/https://orcid.org/0000-0002-1809-7096
Peat soils exhibit very high organic and moisture contents with corresponding very high compressibility and creep characteristics and very low strength. These poor engineering properties make peat soils particularly unsuitable as a foundation material for road pavements with attendant high risks of instability during both initial construction and in service with unpredictable and often excessive long-term deformations. Almost 20% of Ireland is peatland and roads have been historically constructed directly on peat, albeit with mixed results and often high, long-term maintenance costs. Ground improvement by means of excavation and replacement of peat is frequently adopted and more recently piled embankments are increasingly used in areas of deep peat deposits in Ireland for major roads. However, these mitigation measures can have high construction costs and attendant risks as well as large resultant waste volumes and environmental sustainability impacts. The paper briefly reviews the historical approaches to road construction in peat soils both in Ireland and internationally. Analytical methods to assess flexible pavement foundation stability and deformation under static embankment and dynamic traffic loading are reviewed. A number of case histories of low capacity (less than 2000 AADT) road foundation design and performance on Irish peat soils are described. The benefits of surcharge upon the creep performance of peats are discussed and back calculated, and field performance data from one site is presented. Some conclusions are drawn as to the potential for increased application of geosynthetic base reinforcement and ground improvement approaches in peat soils which are less commonly adopted at present in Ireland.
Design and Performance of Low Capacity Roads on Peat Foundation Soils in Ireland
https://orcid.org/https://orcid.org/0000-0003-3515-9380
https://orcid.org/https://orcid.org/0000-0002-1809-7096
Peat soils exhibit very high organic and moisture contents with corresponding very high compressibility and creep characteristics and very low strength. These poor engineering properties make peat soils particularly unsuitable as a foundation material for road pavements with attendant high risks of instability during both initial construction and in service with unpredictable and often excessive long-term deformations. Almost 20% of Ireland is peatland and roads have been historically constructed directly on peat, albeit with mixed results and often high, long-term maintenance costs. Ground improvement by means of excavation and replacement of peat is frequently adopted and more recently piled embankments are increasingly used in areas of deep peat deposits in Ireland for major roads. However, these mitigation measures can have high construction costs and attendant risks as well as large resultant waste volumes and environmental sustainability impacts. The paper briefly reviews the historical approaches to road construction in peat soils both in Ireland and internationally. Analytical methods to assess flexible pavement foundation stability and deformation under static embankment and dynamic traffic loading are reviewed. A number of case histories of low capacity (less than 2000 AADT) road foundation design and performance on Irish peat soils are described. The benefits of surcharge upon the creep performance of peats are discussed and back calculated, and field performance data from one site is presented. Some conclusions are drawn as to the potential for increased application of geosynthetic base reinforcement and ground improvement approaches in peat soils which are less commonly adopted at present in Ireland.
Design and Performance of Low Capacity Roads on Peat Foundation Soils in Ireland
Lecture Notes in Civil Engineering
Tutumluer, Erol (Herausgeber:in) / Nazarian, Soheil (Herausgeber:in) / Al-Qadi, Imad (Herausgeber:in) / Qamhia, Issam I.A. (Herausgeber:in) / Reilly, Ciaran (Autor:in) / Buggy, Fintan (Autor:in)
17.09.2021
13 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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