Abstract
Subjected to continuous wave loading, the responses of pile foundations and seabed develop gradually, severely affecting the serviceability of piled structures. This paper presents the results of a series of flume experiments on pile foundations in fine sandy and silty seabed under regular wave loading. Pile-head displacement and pore water pressure were measured and the effects of pile diameter, cross-section, pile stiffness and wave height were investigated. The experimental results indicate that the pore pressure in fine sandy seabed varied only slightly even under 640 s of wave loading but showed an increase of 15.7–25.9% around a pile. In silty seabed with much lower permeability, pore pressure accumulated quickly due to piles and oscillated impressively at the depth of soil liquefaction. Based on the comparison between the calculated and measured pile-head displacement, we found that the response of smaller-diameter piles in lower-permeability seabed was much more easily magnified by the induced pore pressure. Increasing the pile diameter and attaching fins could lead to a smaller response of piles. Wave height was a major factor in the experiments that affected the development of response.
Highlights
Eighty percent of current offshore turbines in regions with water depth less than 40 m are supported by pile foundations [1]
Waves can cause the cyclic responses of piles and accumulate pore water pressure in the seabed, which is related to the permeability of seabed sediments
An earlier rapid accumulation process of pore pressure was observed with higher wave height in T9(s-H10-D3p) and with an unstable response state containing of 15a descent period
Summary
Eighty percent of current offshore turbines in regions with water depth less than 40 m are supported by pile foundations [1]. The accumulation of pore pressure is often studied through experiments because of the relatively complex mechanism [21–24]. In these studies, pile foundations are commonly. Seabed are experiments in an integrated interaction relatively complex mechanism [21–24]. In these studies, pile foundations are commonly status, whereby separating the two aspects may not necessarily lead to conservative reneglected. A more promising approach to the study of piles in seabed is to use an integrated method by coupling the two aspects. This study utilized flume experiments via which the response of piles and seabed under wave loading were measured.
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