粤东海域粉质土的循环加载特性研究  

Study on cyclic loading characteristics of silty soils offshore eastern Guangdong

作　　者：黎鹏飞 毕乾 张友虎 严华刚 任博 慕仝 LI Pengfei;BI Qian;ZHANG Youhu;YAN Huagang;REN Bo;MU Tong(China Nuclear Power Engineering Co.,Ltd.,Shenzhen 518100,China;School of Civil Engineering,Southeast University,Nanjing 211189,China)

机构地区：[1]深圳中广核工程设计有限公司,广东深圳518100 [2]东南大学土木工程学院,江苏南京211189

出　　处：《海洋通报》2024年第4期497-509,共13页Marine Science Bulletin

基　　金：国家自然科学基金(52109117);中央高校基本科研业务费专项资金。

摘　　要：风-浪-流等海洋环境因素以及风机运行引发的振动都会导致海上风机基础长期处于循环荷载的作用下,因此,掌握地基土在循环加载条件下的力学特性对海上风电基础设计至关重要。我国南海海洋地质条件复杂,粉质土分布广泛,当前针对南海浅表地层粉质土循环加载力学特性尚缺乏系统性研究,是该区域开展海上风电基础设计的重要挑战之一。本文依托粤东某海上风电工程,针对该风场的若干代表性粉质土层开展了系统性试验研究。基于系统性单调及循环加载单剪(DSS)试验结果,研究获得了代表性粉质土层归一化剪切强度、应变及孔隙水压力的等值线云图。该套循环加载等值线云图不仅有力支撑了依托项目风机基础的工程设计,也可为该海域其他海上风电项目基础设计提供重要参考。Marine environmental factors such as wind,wave and current as well as the vibration caused by the operation of the offshore wind turbine lead to sustained cyclic loading on offshore wind turbine foundations.It is therefore very important to understand the mechanical properties of the seabed soils under cyclic loading conditions for the design of foundations.The geological conditions in the Nanhai Sea are complex and silty soils are widely distributed.At present,there is a lack of systematic research on the cyclic loading properties of the shallow silty soils in the Nanhai Sea,which presents a major challenge for the design of offshore wind turbine foundations in the area.In this paper,based on an offshore wind farm project in eastern Guangdong,a systematic experimental study was carried out on several representative silty soil layers.Based on the results of systematic monotonic and cyclic loading direct simple shear(DSS)tests,normalized monotonic shear strength,cyclic contour diagrams of strain and pore pressure were obtained.The set of cyclic loading contour diagrams not only effectively supported the design of wind turbine foundations of the project,but also provides an important reference for other projects in the region.

关 键 词：循环加载 单剪试验 等值线云图 海上风电 

分 类 号：P75[天文地球—海洋科学] TU435[建筑科学—岩土工程]