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The Mechanics of Friction Fatigue in Jacked Piles Installed in Sand
The limit shaft resistance of displacement piles decreases with the number of axial loading cycles applied during pile installation (e.g., jacking, driving) or due to the nature of superstructure loading. This study examines the mechanisms governing the phenomenon of friction fatigue along piles jacked in sandy soils. Finite element analysis (FEA) of a thin disk of soil surrounding the pile shaft is performed. The pile installation process is modeled as a sequential combination of cylindrical cavity expansion and vertical shearing along the pile-soil interface. The soil disk is subjected to several vertical shearing cycles to simulate the successive application and removal of jacking loads. An advanced soil constitutive model based on two-surface plasticity and critical state theory is used in the FE simulations. FEAs examine the development and evolution of the normal stress acting on the pile shaft, which multiplied by an appropriate friction coefficient yields the value of mobilized shaft resistance. Results show that, in the absence of loading cycles, the normal stress attains values considerably larger than the in situ vertical stress. However, with subsequent application of loading cycles, the normal stress decreases at rates that increase with decreasing relative density and in situ vertical stress.
The Mechanics of Friction Fatigue in Jacked Piles Installed in Sand
The limit shaft resistance of displacement piles decreases with the number of axial loading cycles applied during pile installation (e.g., jacking, driving) or due to the nature of superstructure loading. This study examines the mechanisms governing the phenomenon of friction fatigue along piles jacked in sandy soils. Finite element analysis (FEA) of a thin disk of soil surrounding the pile shaft is performed. The pile installation process is modeled as a sequential combination of cylindrical cavity expansion and vertical shearing along the pile-soil interface. The soil disk is subjected to several vertical shearing cycles to simulate the successive application and removal of jacking loads. An advanced soil constitutive model based on two-surface plasticity and critical state theory is used in the FE simulations. FEAs examine the development and evolution of the normal stress acting on the pile shaft, which multiplied by an appropriate friction coefficient yields the value of mobilized shaft resistance. Results show that, in the absence of loading cycles, the normal stress attains values considerably larger than the in situ vertical stress. However, with subsequent application of loading cycles, the normal stress decreases at rates that increase with decreasing relative density and in situ vertical stress.
The Mechanics of Friction Fatigue in Jacked Piles Installed in Sand
Basu, Prasenjit (author) / Loukidis, Dimitrios (author) / Prezzi, Monica (author) / Salgado, Rodrigo (author)
Geo-Congress 2014 ; 2014 ; Atlanta, Georgia
2014-02-24
Conference paper
Electronic Resource
English
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