| Civil and Mechanical Engineering |
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| Responses of reinforced concrete pile group in two-layered liquefied soils: shake-table investigations |
| Lei Su, Liang Tang, Xian-zhang Ling, Neng-pan Ju, Xia Gao |
| School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China; State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China |
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Abstract 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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Received: 07 April 2014
Published: 03 February 2015
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