Responses of reinforced concrete pile group in two-layered liquefied soils: shake-table investigations

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.

Influence of structure on the aseismic stability and dynamic responses of liquefiable soil

“…Therefore, the problems of soil-structure dynamic interaction under seismic loadings should be more complicated involving the liquefaction of saturated sand. Study on soil liquefaction under seismic loadings is still an important research topic in geotechnical earthquake engineering [1], and many scholars have carried out a large number of studies on the liquefaction possibility discrimination of saturated sandy soil, lique ed soil-structure dynamic interaction and foundation failure of lique ed site by means of numerical calculation model [2][3][4][5], various experimental techniques [6][7][8][9][10][11] and theoretical method an analysis [12][13][14][15][16], and the seismic responses of various structures in liquefaction site were discussed in detail.…”

Influence of Structure on the Aseismic Stability and Dynamic Responses of Liquefiable Soil

“…Therefore, the problems of soil-structure dynamic interaction under seismic loadings should be more complicated involving the liquefaction of saturated sand. Study on soil liquefaction under seismic loadings is still an important research topic in geotechnical earthquake engineering [1], and many scholars have carried out a large number of studies on the liquefaction possibility discrimination of saturated sandy soil, lique ed soil-structure dynamic interaction and foundation failure of lique ed site by means of numerical calculation model [2][3][4][5], various experimental techniques [6][7][8][9][10][11] and theoretical method an analysis [12][13][14][15][16], and the seismic responses of various structures in liquefaction site were discussed in detail.…”