Abstract: Pile groups are widely used in offshore wind power generation as its foundation. The bearing capacity and deformation of foundation, with strict requirements for the wind power generations, is of great significance to be investigated under horizontal loads that is the control factor of the fans tower. Centrifuge model tests for offshore pile foundation and typical clay ground are conducted to actively study the pile behavior and the deformation characteristics of the surrounding soil. The test results show that: under horizontal loads, the displacement of pile top increases with the increasing load, while the increasing rate speeds up after the critical horizontal load. The bending moment of pile has a maximum in the 1/5 of burying depth and a minimum in the 3/5 of it, while there is a certain value at the bottom of the pile. The deformation of the soil around the pile, which is divided into active region and passive region, decreases as the distance from the pile increases, while the influence area expands with the increasing horizontal load, and finally stabilizes at twice the pile diameter range.

Key words: wind power generation, pile foundation, horizontal loading, centrifuge model test, deformation