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
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.
Lei Su, Liang Tang, Xian-zhang Ling, Neng-pan Ju, Xia Gao. Responses of reinforced concrete pile group in two-layered liquefied soils: shake-table investigations. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2015, 16(2): 93-104.
