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Saeed Yazdani - One of the best experts on this subject based on the ideXlab platform.
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influence of temperature on Soil Pile interface shear strength
Geomechanics for Energy and the Environment, 2019Co-Authors: Saeed Yazdani, Sam Helwany, Guney C OlgunAbstract:Abstract Geothermal Piles are subjected to daily and seasonal cyclic temperature changes during their life spans. These temperature changes (heat cycles) induce cyclic expansion/contraction along the Soil–Pile interface that may affect interface properties such as shear strength. A series of direct shear tests was conducted using a temperature controlled direct shear test apparatus to evaluate the effects of heat cycles on Soil–Pile interface strength. The interface temperature was cycled between 24 ° C and 34 ° C to simulate the real thermal conditions that an energy Pile may experience. Non-cyclic and cyclic thermal loading were applied under different stress states and histories. It was found that the shearing behavior of interface under thermal loading is described through thermally induced changes in Mohr–Coulomb’s parameters of the interface. Moreover, the thermally induced changes in interface strength are mainly controlled by the Soil stress state and the Soil stress history.
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Influence of temperature on Soil–Pile interface shear strength
Geomechanics for Energy and the Environment, 2019Co-Authors: Saeed Yazdani, Sam Helwany, C. Guney OlgunAbstract:Abstract Geothermal Piles are subjected to daily and seasonal cyclic temperature changes during their life spans. These temperature changes (heat cycles) induce cyclic expansion/contraction along the Soil–Pile interface that may affect interface properties such as shear strength. A series of direct shear tests was conducted using a temperature controlled direct shear test apparatus to evaluate the effects of heat cycles on Soil–Pile interface strength. The interface temperature was cycled between 24 ° C and 34 ° C to simulate the real thermal conditions that an energy Pile may experience. Non-cyclic and cyclic thermal loading were applied under different stress states and histories. It was found that the shearing behavior of interface under thermal loading is described through thermally induced changes in Mohr–Coulomb’s parameters of the interface. Moreover, the thermally induced changes in interface strength are mainly controlled by the Soil stress state and the Soil stress history.
C. Guney Olgun - One of the best experts on this subject based on the ideXlab platform.
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Influence of temperature on Soil–Pile interface shear strength
Geomechanics for Energy and the Environment, 2019Co-Authors: Saeed Yazdani, Sam Helwany, C. Guney OlgunAbstract:Abstract Geothermal Piles are subjected to daily and seasonal cyclic temperature changes during their life spans. These temperature changes (heat cycles) induce cyclic expansion/contraction along the Soil–Pile interface that may affect interface properties such as shear strength. A series of direct shear tests was conducted using a temperature controlled direct shear test apparatus to evaluate the effects of heat cycles on Soil–Pile interface strength. The interface temperature was cycled between 24 ° C and 34 ° C to simulate the real thermal conditions that an energy Pile may experience. Non-cyclic and cyclic thermal loading were applied under different stress states and histories. It was found that the shearing behavior of interface under thermal loading is described through thermally induced changes in Mohr–Coulomb’s parameters of the interface. Moreover, the thermally induced changes in interface strength are mainly controlled by the Soil stress state and the Soil stress history.
Guney C Olgun - One of the best experts on this subject based on the ideXlab platform.
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influence of temperature on Soil Pile interface shear strength
Geomechanics for Energy and the Environment, 2019Co-Authors: Saeed Yazdani, Sam Helwany, Guney C OlgunAbstract:Abstract Geothermal Piles are subjected to daily and seasonal cyclic temperature changes during their life spans. These temperature changes (heat cycles) induce cyclic expansion/contraction along the Soil–Pile interface that may affect interface properties such as shear strength. A series of direct shear tests was conducted using a temperature controlled direct shear test apparatus to evaluate the effects of heat cycles on Soil–Pile interface strength. The interface temperature was cycled between 24 ° C and 34 ° C to simulate the real thermal conditions that an energy Pile may experience. Non-cyclic and cyclic thermal loading were applied under different stress states and histories. It was found that the shearing behavior of interface under thermal loading is described through thermally induced changes in Mohr–Coulomb’s parameters of the interface. Moreover, the thermally induced changes in interface strength are mainly controlled by the Soil stress state and the Soil stress history.
Sam Helwany - One of the best experts on this subject based on the ideXlab platform.
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influence of temperature on Soil Pile interface shear strength
Geomechanics for Energy and the Environment, 2019Co-Authors: Saeed Yazdani, Sam Helwany, Guney C OlgunAbstract:Abstract Geothermal Piles are subjected to daily and seasonal cyclic temperature changes during their life spans. These temperature changes (heat cycles) induce cyclic expansion/contraction along the Soil–Pile interface that may affect interface properties such as shear strength. A series of direct shear tests was conducted using a temperature controlled direct shear test apparatus to evaluate the effects of heat cycles on Soil–Pile interface strength. The interface temperature was cycled between 24 ° C and 34 ° C to simulate the real thermal conditions that an energy Pile may experience. Non-cyclic and cyclic thermal loading were applied under different stress states and histories. It was found that the shearing behavior of interface under thermal loading is described through thermally induced changes in Mohr–Coulomb’s parameters of the interface. Moreover, the thermally induced changes in interface strength are mainly controlled by the Soil stress state and the Soil stress history.
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Influence of temperature on Soil–Pile interface shear strength
Geomechanics for Energy and the Environment, 2019Co-Authors: Saeed Yazdani, Sam Helwany, C. Guney OlgunAbstract:Abstract Geothermal Piles are subjected to daily and seasonal cyclic temperature changes during their life spans. These temperature changes (heat cycles) induce cyclic expansion/contraction along the Soil–Pile interface that may affect interface properties such as shear strength. A series of direct shear tests was conducted using a temperature controlled direct shear test apparatus to evaluate the effects of heat cycles on Soil–Pile interface strength. The interface temperature was cycled between 24 ° C and 34 ° C to simulate the real thermal conditions that an energy Pile may experience. Non-cyclic and cyclic thermal loading were applied under different stress states and histories. It was found that the shearing behavior of interface under thermal loading is described through thermally induced changes in Mohr–Coulomb’s parameters of the interface. Moreover, the thermally induced changes in interface strength are mainly controlled by the Soil stress state and the Soil stress history.
Kyriazis Pitilakis - One of the best experts on this subject based on the ideXlab platform.
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Experimental p-y loops for estimating seismic Soil-Pile interaction
Bulletin of Earthquake Engineering, 2009Co-Authors: E. Rovithis, Emmanuil Kirtas, Kyriazis PitilakisAbstract:Seismic Soil-Pile interaction is evaluated in this study based on back-calculated p-y loops constructed from sampled data of Pile bending moments. Fundamental properties of p-y loops are implemented to derive distributed springs and dashpots, thereby quantifying Soil-Pile interaction in the realm of a Beam on Dynamic Winkler Foundation modeling. The procedure is validated by means of well-documented centrifuge tests of a single Pile supported structure founded on a two-layer Soil profile that comprises of soft clay overlying dense sand. Two shaking levels of a real earthquake motion applied at the base of the Soil profile were examined and the generated seismic p-y loops were compared to cyclic p-y curves commonly used in Pile design practice. The results demonstrate the strong influence of intensity of the input motion on seismic p-y loops while cyclic p-y curves established for soft clays tend to overestimate Soil stiffness under strong excitation. Typical sets of recorded and computed structural response are presented, denoting the ability of the BDWF model related to p-y loops in reproducing adequately fundamental aspects of seismic Soil-Pile interaction.
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EVALUATION OF DYNAMIC Soil-Pile INTERACTION BASED ON BACK CALCULATED P-Y CURVES
2007Co-Authors: E. Rovithis, Emmanuil Kirtas, Kyriazis PitilakisAbstract:Soil-Pile interaction constitutes an important parameter in predicting the seismic response of Pilesupported structures. Towards a computationally attractive investigation of the interaction mechanism, the p-y method, where the Soil is represented as a series of independent springs distributed along the Pile shaft, has been extensively used. Along these lines several p-y curves for different Soil-Pile systems have been proposed which are mainly based on in-situ Pile tests under static or low frequency cyclic loading conditions. However, Soil-Pile interaction under seismic excitation becomes more complex due to the incident seismic waves scattered by the Pile, thus modifying the p-y relationship and introducing an additional damping mechanism at the Soil-Pile interface. In this paper, dynamic Soil-Pile interaction is estimated based on back-calculated p-y curves, disregarding in a first stage any potential Soil-Pile gapping mechanism. Pile displacements and Soil reactions are derived through double integrating and differentiating respectively the bending moments obtained along the Pile shaft. The p-y curves generated at each depth are utilized to derive frequency dependent springs and dashpots, which may then be implemented within the framework of a Beam on Dynamic Winkler foundation modeling of the Soil-Pile system. The proposed procedure is validated through centrifuge tests results of a coupled Soil-Pile-structure system under real earthquake excitation and is also compared to existing analytical formulas of frequency dependent springs and dashpots under steady state harmonic excitation applied on the Pile head. Analysis results reveal that for each one of the loading scenarios considered, Soil-Pile interaction mechanism is adequately captured while utilizing existing analytical expressions for the computation of dynamic Soil spring supports may under certain conditions lead to an overestimation of Pile and structural response when the coupled Soil-Pilestructure system is analyzed.