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Keywords

Seismic interaction, Pile groups, Shaking table tests, Bending moment, Layered clay, Pile spacing

Document Type

Article

Abstract

This study experimentally investigates the seismic bending-moment response of a five-pile group embedded in layered cohesive soil comprising soft clay overlying stiff clay. A series of 1-g shaking-table tests was conducted using a 0.8 × 0.6 × 0.84 m laminar shear box and a 1:50-scale physical model to examine the effects of seismic intensity, pile spacing, pile position, and soil condition. Two excitation levels (0.10g and 0.47g), two pile spacings (3D and 5D), and homogeneous and layered clay profiles were investigated. The results showed that increasing the excitation intensity generally increased the bending-moment response, with the magnitude of the increase depending on pile spacing, pile position, soil condition, and depth. In layered clay under 0.47g excitation, increasing the pile spacing from 3D to 5D increased the maximum corner-pile bending moment from 13.45 to 15.50 N· m and the middle-pile moment from 5.46 to 8.10 N· m, corresponding to increases of 15.2% and 48.4%, respectively. Corner piles generally developed higher bending moments than middle piles under strong shaking. A secondary bending response was observed near the soft–stiff clay interface at approximately 430 mm depth. Direct comparison with homogeneous clay demonstrated that the influence of soil stratification was dependent on pile spacing, pile position, and depth rather than following a uniform trend. The findings highlight the combined influence of seismic intensity, soil stratification, pile spacing, pile position, and depth on the seismic bending-moment distribution of pile groups.

DOI

10.30684/2412-0758.2415

First Page

80

Last Page

100

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