Effect of shaft rotation of spiral piles under its installation on vertical bearing capacity

SATO Takahiro, HARADA Takeo, IWASA Naoto, HAYASHI Satoshi, OTANI Jun

doi:10.3208/jgs.10.253

This study explores the production of a new type of pile. This new spiral pile is made of a twisted steel plate, creating a continuous spiral shape. Before starting the large-scale production of these piles, it is necessary to experimentally investigate their bearing properties, which are related to admissible displacement and installation method. It is also necessary to develop an analytical model to determine their bearing capacity. The purpose of this study is to investigate the bearing properties of the spiral pile and the behavior of the surrounding ground. Considering this, the first objective is to examine the effect of the shape of the pile. The installation method and penetration resistances are thoroughly discussed on the basis of the results of static loading tests using model piles. The static penetration tests were conducted under various shaft rotary conditions. It was confirmed that the shaft rotary condition has a significant impact on the penetration resistance and vertical bearing capacity of the spiral pile. The second objective is to show the behavior of the ground during penetration using X-ray computerized tomography (CT). An industrial X-ray CT scanner was used to observe changes in the density of the sand surrounding the spiral piles during penetration. The disturbance area of the ground surrounding the spiral pile was observed using CT images; the images revealed that the disturbance area surrounding the spiral pile was significantly affected by shaft rotary conditions.

Effect of shaft rotation of spiral piles under its installation on vertical bearing capacity

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