Effect of Relative Density on Lateral Load Capacity of a Cyclic Laterally Loaded Pile in Sandy Soil

모래지반의 상대밀도에 따른 횡방향 반복재하 시 말뚝의 극한지지력 평가

Baek, Sung-Ha;Kim, Joon-Young;Lee, Seung-Hwan;Chung, Choong-Ki

  • Received : 2016.03.04
  • Accepted : 2016.04.16
  • Published : 2016.04.29


Pile foundations used as offshore support structures are dominantly subjected to cyclic lateral loads due to wind and waves. In this study, a series of cyclic lateral load tests were performed on a pre-installed aluminum flexible pile in sandy soil with three different relative densities (40%, 70% and 90%) in order to evaluate the effect of cyclic lateral loads on lateral load capacity of a pile. The cyclic lateral loads increased the lateral load capacity of a pile at 40% relative density, whereas they decreased it at 70% and 90% relative densities. This can be explained by the fact that the cyclic lateral loads slightly densified the surrounding soil in relatively loose sand (40%), while the surrounding soil was disturbed in relatively dense sand (70% and 90%). These effects were more obvious as the cyclic lateral load amplitude increased, being independent with the saturation. Also, from the test results, an empirical equation for the lateral load capacity of a cyclic laterally loaded pile in sandy soil was developed in terms of relative density of the soil and the cyclic lateral load amplitude.


Pile foundation;Model pile test;Lateral load capacity;Cyclic lateral load;Relative density


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