关键词: 海上风机基础, 钢管桩, 关键参数, 现场试验, 承载力, 动力反应

Abstract: In order to investigate the key parameters of high-piled foundation for Donghai Bridge offshore wind turbine, a series of field tests were conducted. The horizontal bearing capacity of offshore steel-pipe vertical pile and batter pile was achieved by the horizontal static load field test; and the vertical bearing capacity of pile was tested by the Osterberg method. The wave force on the steel-pipe pile which was connected and unconnected to the test platform was tested; and the acceleration versus time data and natural vibration frequency were obtained. The results show that the horizontal bearing capacity of the positive batter pile is better than that of the negative batter pile. When the pile is not connected to the test platform, the wave-induced displacement of pile is obviously greater than that of the pile connected to the test platform. The natural vibration frequency of steel-pipe pile is between 1.05 Hz and 1.3 Hz, among which the natural vibration frequency of batter pile is higher than that of vertical pile. The research results are applied to the design for high-piled foundation in this project.

Key words: foundation for offshore wind turbine, steel-pipe pile, key parameters, field test, bearing capacity, dynamic response