鲁东大学学报(自然科学版)

海上光伏系统的安全运行受到多种因素影响，其中桩基础是确保系统稳定性的关键组成部分。为研究海上光伏螺旋桩结构的动力响应特性，建立风浪荷载作用下的土体-螺旋桩基础-上部光伏支架结构的整体数值分析模型，研究了不同海况下海上光伏螺旋桩支撑结构的动力响应，并进一步分析了土体参数对螺旋桩支撑结构动力特性的影响。研究结果表明：随着海况风浪流环境荷载的增加，螺旋桩支撑结构在桩顶及泥面处的位移均显著增大，且发生与所处海况波浪频率一致的循环往复位移；考虑桩土相互作用后，3种典型土质环境下螺旋桩支撑结构的自振频率均相对降低，其中第一阶自振频率分别降低13.2%、17.1%、26.6%;相对于粉土和砂土，在黏土条件下螺旋桩支撑结构位移相对较大，桩顶最大位移增大了约1.1、1.3倍，泥面处最大位移增大了约1.4、2.0倍，土质参数对泥面处剪力及弯矩影响较小。

The safe operation of offshore photovoltaic system is affected by various factors, and pile foundation is a key component to ensure system stability.In order to study the dynamic response characteristics of offshore photovoltaic helical pile structure, the overall structural model of soil-helical pile-the upper photovoltaic support under the action of wind and wave loads was established.Then the dynamic response of the offshore photovoltaic helical pile support structure under different sea conditions was investigated, and the influence of the soil parameter on the dynamic characteristics of the helical pile support structure was further analyzed.The results are shown as follows. With the increase of the environmental load, the displacements of the helical pile support structure at the top of the pile and at the mud surface increase significantly, and the cyclic frequency of displacements is consistent with the wave frequency.After considering the pile-soil interaction, the natural frequency of the helical pile support structure decreases in three typical soil conditions.The first order natural frequency is reduced by 13.2%,17.1% and 26.6%,respectively.Relative to the pulverized soil and sandy soil, the displacement of the helical pile support structure is relatively large under clay conditions, with maximum displacements at the top of the pile increasing by about 1.1 and 1.3 times, and at the mud surface by about 1.4 and 2.0 times.The soil parameters have less influence on the shear force and bending moment at the mud surface.