海上风电大直径植入型嵌岩单桩关键技术
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浙江大学

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Key technologies of large diameter embedded rock-socketed monopile for offshore wind turbines
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Zhejiang University

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    摘要:

    欧洲已经建设的海上风电场,桩基进入的岩层主要以砂岩和砾岩为主,岩石的单轴抗压强度也较低,而中国国内部分近海海域的地质存在着埋藏较浅,且岩石硬度非常高的基岩,部分弱风化岩层的强度可以达到130MPa以上。海上风电大直径植入型嵌岩单桩基础方案作为一种新型的基础创新方案非常适合中国的基岩地质条件。针对软土覆盖层浅,基岩强度大的“植入型”单桩基础嵌岩方案,建立了“桩-基岩-灌浆料”模型,对植入型嵌岩单桩基础进行了受力分析,分析结果表明单桩最大应力与灌浆料最大应力均满足极端情况下的风电基础设计要求,同时介绍了钢管桩与岩孔间填充材料的选择、灌浆施工工艺,以及海上风电大直径嵌岩单桩风险点及解决措施,对海上风电大直径嵌岩单桩的设计开发具有一定的启发作用。

    Abstract:

    In the offshore wind farms that have been built in Europe, the rock strata into which the pile foundation enters are mainly sandstone and gravel, and the uniaxial compressive strength of the rock is also relatively low. However, in the geology of some offshore waters in China, there are bedrock which is shallow buried and very hard, and the strength of some weakly weathered rocks can reach more than 130MPa. As a new foundation scheme, the large diameter embedded rock-socketed monopile foundation scheme for offshore wind turbines is very suitable for the bedrock geological conditions in China. For the topography with shallow overburden and strong bedrock, established a "pile - bedrock - grouting material" model, The stress analysis of embedded rock-socketed monopile foundation is carried out, the analysis results show that the maximum stress of the monopile and grouting material satisfy the requirements of extreme cases of wind turbine foundation design,at the same time introduces the selection of filling materials between steel pile and rock hole, grouting technology, as well as the risk and solutions of large-diameter rock-socketed monopile for offshore wind turbines. Therefore, it has some enlightening effect on the design and development of large diameter rock-socketed monopile for offshore wind turbines.

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  • 收稿日期:2021-01-08
  • 最后修改日期:2021-01-08
  • 录用日期:2021-01-20
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