Journal
JOURNAL OF ZHEJIANG UNIVERSITY-SCIENCE A
Volume 16, Issue 2, Pages 93-104Publisher
ZHEJIANG UNIV
DOI: 10.1631/jzus.A1400093
Keywords
Liquefaction; Dynamic behavior; Pile group effect; Pile group; Shake-table experiment
Categories
Funding
- National Natural Science Foundation of China [51378161, 51108134]
- National Basic Research Program (973 Program) of China [2012CB026104]
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During earthquakes, the response of pile foundations in liquefiable sand reinforced by densification techniques is still a very complex dynamic soil-structure interaction problem. Two shake-table experiments were conducted to investigate the behavior of a reinforced concrete (RC) low-cap pile group embedded in liquefiable soils. Discussion is focused on the behavior of soil-pile-superstructure systems prior to and during liquefaction of the medium-dense and dense sand stratums, which are involved in restoring force characteristics at the superstructure and pile group effect. The test results demonstrated a stiffness reduction and dependent nonlinear behavior appearing in the liquefied medium-dense sand; however, an overall stiffening response was observed in liquefied dense sand. The pile group effect seemed insignificant in liquefied medium-dense sand, but was very significant in the liquefied dense sand.
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