MICROSCALE OBSERVATION AND MODELING OF SOIL-STRUCTURE INTERFACE BEHAVIOR USING PARTICLE IMAGE VELOCIMETRY

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概要

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• The shearing behavior of a soil-structure interface governs the response of many geotechnical systems, in particular piled foundations. The shaft resistance of piled foundations is known to degrade with cyclic loading, although the governing mechanism is not well understood. This paper presents the results of a laboratory soil-structure investigation in which internal specimen deformations were obtained using particle image velocimetry (PIV) and the normal confining stress was permitted to vary according to a constant normal stiffness (CNS) condition. The PIV measurements showed the shear deformation and volume change to be concentrated within a shear band with a thickness of 5-7 particle diameters adjacent to the interface. During a single cycle the volume change within the shear band began with an initial contraction, followed by dilation to the failure envelop. For the cycling amplitude investigated this response led to a net specimen contraction. The benefit of quantifying the thickness and contraction of the shear band using PIV is that the progressive decrease in void ratio of the shear band can be linked to the limiting value imposed by the minimum void ratio. This provides a framework in which the contraction of the specimen depends on the potential contraction expressed as the difference between the current and minimum void ratio. A model for this contraction is presented, and linked to the decay in normal stress and the limiting loss of interface friction. This framework clarifies the mechanism of friction fatigue during installation and loading of displacement piles in sand.

• 社団法人地盤工学会の論文

著者

• White David

  Cambridge University Engineering Department

• Randolph Mark

  University Of Western Australia

• DEJONG JASON

  Civil and Environmental Engineering, University of California

• Dejong Jason

  Civil And Environmental Engineering University Of California

関連論文

• MICROSCALE OBSERVATION AND MODELING OF SOIL-STRUCTURE INTERFACE BEHAVIOR USING PARTICLE IMAGE VELOCIMETRY
• Interface Load Transfer Degradation during Cyclic Loading: A Microscale Investigation (IS-LYON 2003「地盤材料の変形特性」特集号)

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