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在近海风力发电工程中桩基是常用的基础型式,海上风力发电机桩基础一般建立于复杂软土地基、承受着海上风浪、潮流等近似水平向的循环荷载作用,而风力发电机组运行对基础的承载力和变形有严格的要求。因此,研究水平循环荷载下桩土系统变形规律和相互作用机制具有重要的意义。针对典型的近海风机单桩基础,选取典型的饱和砂性土地基,通过离心模型试验的方法研究了水平循环荷载下的风机桩基础的受力变形规律。试验结果表明,水平向循环作用下,桩周围土体中变形主要呈现为挤压或塌陷产生的沉降和水平向变形,变形主要集中在桩周围较小的范围内;变形呈现逐渐累积特性,其大小随着循环次数的增加而增加;桩身弯矩峰值出现在埋深上1/3处,多次循环后的弯矩大小和分布变化不大;桩周围土体中不同位置产生不同的超静孔隙水压力,孔隙水压力发展对土体变形有一定影响。
In the offshore wind power project pile foundation is commonly used as the basic type, offshore wind turbine pile foundation is generally built on complex soft soil foundation, to withstand the offshore wind waves, tidal currents and other similar horizontal cyclic loading, and wind turbine operation on the basis of The bearing capacity and deformation have strict requirements. Therefore, it is of great significance to study the deformation law and interaction mechanism of pile-soil system under horizontal cyclic loading. For a typical offshore wind turbine monopile foundation, a typical saturated sandy soil foundation is selected. The stress and deformation laws of the wind turbine pile foundation under horizontal cyclic loading are studied by centrifugal model test. The experimental results show that under horizontal cyclic loading, the deformation in the soil around the pile is mainly the settlement and horizontal deformation caused by the extrusion or collapse, and the deformation mainly concentrates in the smaller range around the pile. The deformation shows the gradual accumulation characteristics The size increases with the increase of the number of cycles; the peak value of pile bending moment appears at 1/3 of the depth of the pile, the bending moment does not change much after multiple cycles; different positions in the soil around the pile produce different super Static pore water pressure and pore water pressure have certain influence on soil deformation.