Soil-water coupling behavior of group-pile foundation in saturated / unsaturated medium-dense sandy ground subjected to earthquake loading

Q: What does this research mean for the field?

In saturated and unsaturated medium-dense sandy ground during earthquakes, the maximum bending moment on group-pile foundations occurs near the center of the ground layer rather than at the pile head, and its dependence on ground displacement becomes more than twice that of inertial force when the unsaturated layer constitutes 60% of the total thickness. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

Shu SUZUKI; Feng ZHANG

doi:10.3208/jgs.21.309

August 31, 2026Japanese Geotechnical JournalOpen Access

Soil-water coupling behavior of group-pile foundation in saturated / unsaturated medium-dense sandy ground subjected to earthquake loading

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Key Points

To evaluate the vibration characteristics and seismic mechanical response of group-pile foundations embedded in medium-dense sand under varying saturated and unsaturated layer depths.
Conducted 1G shaking table experiments on model group-pile foundations embedded in medium-dense sandy soil.
Tested multiple configurations by varying the thickness of the unsaturated soil layer relative to the underlying saturated layer.
The maximum pile bending moment occurred near the middle depth of the soil layer rather than at the pile head where inertial forces typically peak.
When the unsaturated layer reached 60% of total ground thickness, the influence of ground displacement on pile bending moment was more than twice as large as that of structural inertial force.

Implication

Shaking table study reveals maximum pile bending occurs at mid-depth in layered medium-dense sand, indicating ground displacement dominates over structural inertia during earthquakes.

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Cite This Study

SUZUKI et al. (2026) studied this question.

synapsesocial.com/papers/6a9934cf636c6408cfa7c7f0 https://doi.org/10.3208/jgs.21.309

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Soil-water coupling behavior of group-pile foundation in saturated / unsaturated medium-dense sandy ground subjected to earthquake loading

Key Points

Implication

Abstract

Discussion

Cite This Study

Soil-water coupling behavior of group-pile foundation in saturated / unsaturated medium-dense sandy ground subjected to earthquake loading

Key Points

Implication

Abstract

Discussion

Cite This Study

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