Comparison of penetration resistance and vertical capacity of short piles installed by Standard Press-in in loose sand

TY - CONF

T1 - Comparison of penetration resistance and vertical capacity of short piles installed by Standard Press-in in loose sand

AU - Ishihara, Y

AU - Eguchi, M

AU - Brown, Michael

AU - Koseki, J

PY - 2021/6

Y1 - 2021/6

N2 - In the Press-in Method, a vertical jacking force required for installing a pile is automatically measured for every single pile. This information is expected to be utilized to confirm the vertical performance of the pile. In this paper, results of a series of large-scale model tests are reported to compare the resistance during installation and during static load test. The test pile was a closed or open-ended tubular pile with an outer diameter of 318.5 mm, embedded in a loose sand to around 6 m. Phenomena of pile set-up or set-down were observed in some cases. Through literature review and detailed analyses of the experimental data, the cause of the set-down was concluded to be mainly due to the pile installation being terminated at a depth where the soil strength decreased with depth and to a lesser extent because negative pore water pressure was generated during installation.

AB - In the Press-in Method, a vertical jacking force required for installing a pile is automatically measured for every single pile. This information is expected to be utilized to confirm the vertical performance of the pile. In this paper, results of a series of large-scale model tests are reported to compare the resistance during installation and during static load test. The test pile was a closed or open-ended tubular pile with an outer diameter of 318.5 mm, embedded in a loose sand to around 6 m. Phenomena of pile set-up or set-down were observed in some cases. Through literature review and detailed analyses of the experimental data, the cause of the set-down was concluded to be mainly due to the pile installation being terminated at a depth where the soil strength decreased with depth and to a lesser extent because negative pore water pressure was generated during installation.

KW - Press-in piles

KW - Pile foundation

UR - https://icpe-ipa.org/

M3 - Paper

SP - 208

T2 - Second International Conference on Press-in Engineering

Y2 - 19 June 2021 through 20 June 2021

ER -