This paper reports three centrifuge model tests to investigate the responses of one semi-open pile (i.e., H-shaped cross-section) and two solid piles (i.e., circular and rectangular cross-sections) in a consolidating clay stratum.
BUMPY ROAD SHAKER SKIN
© 2018 Institute of Rock and Soil Mechanics, Chinese Academy of SciencesĪlthough semi-open H piles have been widely used, geometric effects (GEs) on H-shaped piles in consolidating ground subjected to negative skin friction (NSF) and downdrag are still not well investigated or understood. Calcareous sand has lower viscous flow effects compared with silica sand at HSRs.
As the applied loading increases, the particle crushing of calcareous sand develops from local instability to whole breakage. However, porous calcareous sand shows yielding and strain-hardening responses that are always followed by particle crushing. The axial stress-strain response of silica sand is mainly governed by the deformation of individual grain and soil skeleton, and particle crushing. The apparent dynamic stiffness of calcareous sand is approximately 10% of that for silica sand due to different particle shapes and mineral compositions. To understand the response of calcareous sand at HSRs, a series of dynamic tests is performed using the split Hopkinson pressure bar (SHPB) with steel sleeve, including 6 validation tests of bar-against-bar and 16 comparative tests relevant to the relative density and strain rate of calcareous and silica sands. This is closely related to pile driving, aircraft wheel loading and mining activities. Calcareous sand has distinct characteristics in comparison with silica sand, such as dynamic behavior at high strain rates (HSRs).
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