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    Modeling Aging of Displacement Piles in Natural Soft Clay

    Source: Journal of Geotechnical and Geoenvironmental Engineering:;2019:;Volume ( 145 ):;issue: 010
    Author:
    Mats Karlsson
    ,
    Jorge Yannie
    ,
    Jelke Dijkstra
    DOI: 10.1061/(ASCE)GT.1943-5606.0002110
    Publisher: American Society of Civil Engineers
    Abstract: A multitude of mechanisms will affect the evolution of the pile response over time, each with their respective time scale. It is shown that most of the processes can be linked to the pile installation stage, which alters the soil surrounding the pile. As a result, there is a change in the mechanical properties of the soil that will influence the subsequent pile response over time. These long-term mechanisms include the dissipation of excess pore pressures from pile installation and the creep in the soil. This paper presents a numerical approach that combines the strain-path method, an advanced effective stress–based constitutive model for soft soils, and a multiphase numerical framework that enables the modeling of the pile installation and subsequent change of pile bearing capacity over time. The presented results demonstrate that the degree of remolding of the soil during the pile installation stage is closely linked to the subsequent pile response. For the Onsøy test case studied, the increase in shaft capacity over time, demonstrated to be linked to undrained strength recovery, could be faithfully reproduced during and after dissipation of excess pore pressures. Hence, pile aging of displacement piles installed in clay is strongly linked to installation effects and the creep and relaxation processes in the soil. Further study is required to fully reveal the physicochemical mechanisms that underpin these processes.
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      Modeling Aging of Displacement Piles in Natural Soft Clay

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4260465
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    contributor authorMats Karlsson
    contributor authorJorge Yannie
    contributor authorJelke Dijkstra
    date accessioned2019-09-18T10:42:10Z
    date available2019-09-18T10:42:10Z
    date issued2019
    identifier other%28ASCE%29GT.1943-5606.0002110.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4260465
    description abstractA multitude of mechanisms will affect the evolution of the pile response over time, each with their respective time scale. It is shown that most of the processes can be linked to the pile installation stage, which alters the soil surrounding the pile. As a result, there is a change in the mechanical properties of the soil that will influence the subsequent pile response over time. These long-term mechanisms include the dissipation of excess pore pressures from pile installation and the creep in the soil. This paper presents a numerical approach that combines the strain-path method, an advanced effective stress–based constitutive model for soft soils, and a multiphase numerical framework that enables the modeling of the pile installation and subsequent change of pile bearing capacity over time. The presented results demonstrate that the degree of remolding of the soil during the pile installation stage is closely linked to the subsequent pile response. For the Onsøy test case studied, the increase in shaft capacity over time, demonstrated to be linked to undrained strength recovery, could be faithfully reproduced during and after dissipation of excess pore pressures. Hence, pile aging of displacement piles installed in clay is strongly linked to installation effects and the creep and relaxation processes in the soil. Further study is required to fully reveal the physicochemical mechanisms that underpin these processes.
    publisherAmerican Society of Civil Engineers
    titleModeling Aging of Displacement Piles in Natural Soft Clay
    typeJournal Paper
    journal volume145
    journal issue10
    journal titleJournal of Geotechnical and Geoenvironmental Engineering
    identifier doi10.1061/(ASCE)GT.1943-5606.0002110
    page04019070
    treeJournal of Geotechnical and Geoenvironmental Engineering:;2019:;Volume ( 145 ):;issue: 010
    contenttypeFulltext
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