Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
An axial load transfer model for piles driven in chalk
A wide range of onshore and offshore structures are founded on piles driven in chalk, which is encountered under large areas of Northern Europe and other locations worldwide. Their safe and economical design is made difficult by current uncertainties regarding their axial capacity and load-displacement behaviour. This paper builds on recent research into the axial capacity of open-ended driven piles by proposing new shaft and base load transfer models for chalk that employ geotechnical properties measured directly in laboratory and in-situ tests. After setting out a new closed-form elastic analysis of the initial tension loading response, a new non-linear shaft model is proposed that captures the radial variation in properties induced by pile installation in chalk and uncouples the piles’ stiffness responses from their ultimate local shaft resistances, which are predicted independently. A new base model is also outlined that predicts the loading response based on the chalk’s small-strain stiffness and CPT cone resistances. The models are shown to offer good load-displacement predictions for 0.139 m to 1.8 m diameter piles tested between 20 days and 600 days after driving at several sites. Improved reliability and accuracy are demonstrated through comparison with existing load-transfer methods.
An axial load transfer model for piles driven in chalk
A wide range of onshore and offshore structures are founded on piles driven in chalk, which is encountered under large areas of Northern Europe and other locations worldwide. Their safe and economical design is made difficult by current uncertainties regarding their axial capacity and load-displacement behaviour. This paper builds on recent research into the axial capacity of open-ended driven piles by proposing new shaft and base load transfer models for chalk that employ geotechnical properties measured directly in laboratory and in-situ tests. After setting out a new closed-form elastic analysis of the initial tension loading response, a new non-linear shaft model is proposed that captures the radial variation in properties induced by pile installation in chalk and uncouples the piles’ stiffness responses from their ultimate local shaft resistances, which are predicted independently. A new base model is also outlined that predicts the loading response based on the chalk’s small-strain stiffness and CPT cone resistances. The models are shown to offer good load-displacement predictions for 0.139 m to 1.8 m diameter piles tested between 20 days and 600 days after driving at several sites. Improved reliability and accuracy are demonstrated through comparison with existing load-transfer methods.
An axial load transfer model for piles driven in chalk
Wen, Kai (Autor:in) / Kontoe, Stavroula (Autor:in) / Jardine, Richard J. (Autor:in) / Liu, Tingfa (Autor:in)
07.09.2023
Wen , K , Kontoe , S , Jardine , R J & Liu , T 2023 , ' An axial load transfer model for piles driven in chalk ' , Journal of Geotechnical and Geoenvironmental Engineering , vol. 149 , no. 11 , 04023107 . https://doi.org/10.1061/JGGEFK.GTENG-11368
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch