| 南海海域典型粉质黏土动模量衰减曲线试验研究 |
| Experimental Study on the Dynamic Shear Modulus of Offshore Silty Clay in the South China Sea |
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| DOI：doi：10.3969/j.issn.1003-2029.2025.04.010 |
| 中文关键词: 粉质黏土 动剪切模量 循环单剪试验 共振柱试验 |
| 英文关键词:silty clay dynamic shear modulus cyclic direct simple shear test resonant column test |
| 基金项目:广东省海洋经济发展（海洋六大专项） 项目（粤自然资合〔2022〕25） |
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| 中文摘要: |
| 桩土相互作用刚度对海上风机整机频率影响重大，对准确预测风机结构疲劳损伤至关
重要。多数情况下，它将主导风机基础的尺寸设计，甚至影响海上风机基础形式的类型。随着
基于土体应力-应变曲线推求桩土相互作用普适性p-y 弹簧模型的建立，土单元层面的应力-应
变曲线成为应用该p-y 弹簧模型的前提。对于海上风机这一动力结构，在应用p-y 弹簧模型时需
要考虑土体的循环特性。为此，应采用土体归一化动剪切模量推求归一化应力-应变曲线的方法
来捕捉土体的循环特征。我国海域粉质黏土分布广泛，对粉质黏土的动剪切模量特性开展针对
性研究至关重要。本文采用共振柱和循环单剪试验联合测试土体低-中-高应变范围内的动剪切
模量，并与应用较为广泛的动剪切模量经验模型的预测结果进行了对比。结果显示：粉质黏土
的归一化动剪切模量-循环剪应变曲线仍然呈现倒“S”形，动剪切模量试验结果与经验模型吻
合较好。在实际工程中，缺少试验数据时推荐采用经验模型计算粉质黏土动剪切模量，研究成
果对海上风电地震工程与结构优化设计具有积极意义。 |
| 英文摘要: |
| The stiffness of soil-pile interaction has a significant impact on the overall frequency of offshore wind turbines and is crucial for
accurately predicting the fatigue damage of turbine structures. In most cases, it dictates the design dimensions of turbine foundations and
may even influence the type of offshore wind turbine foundation. With the establishment of a generalized p-y spring model for soil-pile interaction based on soil stress-strain curves, it is essential to obtain stress-strain curves at the soil element level as a prerequisite for applying
this p-y spring model. Additionally, for the dynamic structure of offshore wind turbines, it is necessary to consider the cyclic properties of
the soil when applying the p-y spring model. Therefore, a method based on the normalized dynamic shear modulus of the soil is recommended to derive a normalized stress-strain curve that captures the cyclic characteristics of the soil. Silty clay is widely distributed in China's sea areas, and conducting targeted research on the dynamic shear modulus characteristics of silty clay is essential. This study uses resonant column and cyclic simple shear tests to measure the dynamic shear modulus of soil within low, medium, and high strain ranges and
compares the results with predictions from widely used empirical models of dynamic shear modulus. The results show that the normalized
dynamic shear modulus-cyclic shear strain curve of silty clay still exhibits an inverted “S”shape, and the experimental results of dynamic
shear modulus are in good agreement with the empirical models. In practical engineering applications, when experimental data are lacking,
it is recommended to use empirical models to calculate the dynamic shear modulus of silty clay. The research findings have positive implications for offshore wind power seismic engineering and structural optimization design. |
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