灌浆料对海上风电大直径Ⅲ型嵌岩单桩承载性能的影响

Influence of Grouting Material on the Bearing Behavior of Type Ⅲ Rock-Socketed Monopile for Offshore Wind Turbines

基于福建南日岛海上风电工程项目设计资料,采用ABAQUS软件建立海上风电大直径Ⅲ型嵌岩单桩基础“桩-灌浆层-基岩”有限元模型,对灌浆料性能参数展开参数敏感性分析,研究其不同取值对嵌岩单桩水平承载性能以及桩土相互作用机理的影响程度。计算结果表明,增大灌浆层厚度有利于改善桩基入土段的应力情况并显著提升其水平承载性能;灌浆层厚度的增大能够避免灌浆层开裂以及岩土层的破坏;相比于改变灌浆料厚度,增大灌浆料的材料强度并未对嵌岩单桩的水平承载性能产生较大影响。该结果可以指导嵌岩单桩设计,以探究合适的钻孔及灌浆方法,为工程实际施工提供参考。

Based on the design data of Fujian Nanri Island offshore wind power project,the ABAQUS software is adopted to establish the"pile-grouting layer-bedrock"finite element model of type Ⅲ large diameter rock-socketed monopile foundation,and the sensitivity analysis of the grouting parameters is carried out to study the effect of different values on the horizontal bearing behavior of the rock-socketed monopile and the pile-soil interaction mechanism.The calculation results show that increasing the thickness of the grouting layer is beneficial to improving the stress condition of the pile foundation penetrating in sea-bed and significantly improving its horizontal bearing behavior.The increase of the thickness of the grouting layer can avoid the cracking of the grouting layer and the destruction of the soil layer.Compared with changing the thickness of grouting material,increasing the material strength has no great influence on the horizontal bearing performance of rock-sockted monopile.This result can guide the design of rock-socketed monopiles to explore suitable drilling and grouting methods,providing references for the actual construction of the project.