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桩基础是近海风力发电中经常采用的基础形式,承受着包括低频风循环荷载在内的复杂荷载组合。为了采用离心模型试验来研究风机桩基础特性,研制了离心场中风机桩基础复杂加载测试设备。该套设备除了可以施加水平向和竖向静力荷载外,还实现了离心场中长时间低频率的水平循环加载,并能够实现多种荷载同时或者先后施加。通过一系列测试试验,验证了该套设备的有效性,满足离心模型试验中对模拟风机桩基础的复杂荷载要求。初步试验结果表明,桩顶水平位移随着水平荷载循环周数的增加而增大,但增长速率逐渐减小,至一定周数后,桩顶位移趋于稳定,土体变形主要集中在桩周一定区域内。
Pile foundation is a frequently used form of offshore wind power and is subjected to complex load combinations including low-frequency wind cycles. In order to study the foundation characteristics of wind turbine pile by centrifugal model test, a complex loading test equipment for centrifugal pile foundation is developed. In addition to applying horizontal and vertical static loads, the device also achieves long-term, low-frequency horizontal cyclic loading in a centrifugal field and enables multiple loads to be applied simultaneously or sequentially. Through a series of test tests, the effectiveness of the device is verified and the complex load requirements of simulating wind turbine pile foundation in centrifugal model test are satisfied. The preliminary test results show that the horizontal displacement of pile top increases with the increase of the number of horizontal load cycles, but the growth rate decreases gradually. After a certain number of weeks, the displacement of pile top tends to be stable. The soil deformation mainly concentrates on pile circumference Within a certain area.