循环荷载下复合筒型基础地基孔隙水压力变化及液化分析

复合筒型基础是一种新型的宽浅式基础型式。在风、波浪、海流等动力荷载的作用下，复合筒型基础内外地基孔隙水压力的变化对结构安全产生影响。模拟了复合筒型基础受到的风浪流荷载，并将风浪流荷载合理叠加，采用三维有限元方法分析了风浪流联合作用下复合筒型基础地基动力响应规律。同时对复合筒型基础内外地基孔隙水压力的变化规律及液化范围进行了系统分析，通过分析发现：复合筒型基础附近海床液化深度随着饱和度、渗透系数、波浪周期、水深的增大而增大，随着泊松比的增大而减小。

Pore water pressure fluctuation and liquefaction analysis of subgrade for composite bucket foundation under cyclic loading

Composite bucket foundation which is wide and shallow is a new kind of foundation. The fluctuating pore water pressure around the foundation has bad influence on the safety of wind turbine under the wind, wave and current loads. In order to investigate the dynamic response of the foundation under the wind, wave and current loads, the numerical analysis is carried out. The combined effect among the wind, wave, current loads acted on the wind turbine structure and the subgrade is simulated reasonably based on the accurate simulation of various loads, and the model of the dynamic response of bucket foundation is presented with the three-dimensional finite element method. According to the numerical model, the dynamic response pattern of subgrade including the laws of the pore water pressure fluctuation and liquefaction locality around the bucket foundation are identified. It can be concluded that the liquefaction depth in the vicinity of composite bucket foundation increases with the growth of the saturation, permeability, wave period and water depth, and it decreases with the addition of the Poisson ratio.