海上风电复合筒型基础下沉过程现场试验研究 English Version
Field tests on the penetration process of composite bucket foundation for offshore wind turbines
-
摘要: 复合筒型基础是近年来海上风电领域发展的一种基础结构型式，其下沉特征的研究对该种基础成功推广应用至关重要。在江苏如东东部海域进行了海上风电复合筒型基础下沉过程现场试验，分析了下沉过程中基础整体倾角、仓内压力、筒壁-土界面孔隙水压力及土压力的变化规律，探讨了筒壁-土界面接触对筒壁内、外有效界面土压力响应规律的影响。试验结果表明：复合筒型基础在真实风浪流复杂环境荷载作用下顺利下沉至海床地基土预定标高，下沉完毕后基础倾角为0.018?；下沉过程中基础外壁孔隙水压力受潮位及接触土层排水条件影响，而筒内负压作用导致了基础内壁界面土压力峰值较外壁下降约46.7%。此外，研究还提出筒壁-土界面的渗流减阻效应和挤土增阻效应是造成筒壁内、外有效界面土压力的差异性分布主要原因，同时筒壁-土界面泥皮的存在较好地解释了基础穿越粉砂夹粉土层时筒壁所出现的有效界面土压力响应滞后问题。研究成果可为后续复杂地质条件下复合筒型基础的精准下沉提供参考。Abstract: Composite bucket foundation is a type of foundation structure developed in the field of offshore wind power in recent years. The research on its sinking characteristics is very important for the successful popularization and application of this kind of foundation. The field test of the sinking process of offshore wind power composite cylindrical foundation is carried out in the eastern sea area of Ru dong, Jiangsu Province. The variation laws of the overall inclination of the foundation, the pressure in the silo, the pore water pressure and earth pressure at the cylinder wall soil interface during the sinking process are analyzed, and the influence of the cylinder wall soil interface contact on the earth pressure response law of the effective interface inside and outside the cylinder wall is discussed. The test results show that the composite cylindrical foundation sinks smoothly to the predetermined elevation of seabed foundation soil under the complex environmental load of real wind, wave and current, and the foundation inclination is 0.018? after sinking; During the sinking process, the pore water pressure of the outer wall of the foundation is affected by the tide level and the drainage conditions of the contact soil layer, and the negative pressure in the cylinder leads to the peak value of the interface earth pressure of the inner wall of the foundation decreasing by about 46.7% compared with the outer wall. In addition, the study also puts forward that the seepage drag reduction effect and soil squeezing drag increase effect of the cylinder wall soil interface are the main reasons for the differential distribution of the effective interface earth pressure inside and outside the cylinder wall. At the same time, the existence of the mud skin at the cylinder wall soil interface can better explain the lag of the effective interface earth pressure response of the cylinder wall when the foundation passes through the silty sand mixed with silty soil. The research results can provide reference for the accurate sinking of composite tubular foundation under complex geological conditions.
-
期刊类型引用(8)
1. 介玉新. Rowe剪胀方程及一种新的推导方法. 水力发电学报. 2024(01): 109-123 . 
百度学术
2. 蔡新合，陈子玉，李国英. 考虑颗粒破碎能耗的堆石料剪胀方程及其应用. 水利水运工程学报. 2024(03): 127-135 . 百度学术
3. 王步雪岩，孟庆山，钱建固. 基于体积变化的珊瑚砂砾破碎率研究. 岩土力学. 2024(07): 1967-1975 . 百度学术
4. 蔡新合，朱雨萌，李国英. 基于广义塑性理论框架的堆石料变形计算. 水利水运工程学报. 2024(04): 127-139 . 百度学术
5. 程诗芸，彭杨旭，张紫怡，郝晨曦，丰家俊，郭鸿. 土颗粒破碎机理的研究进展. 安徽建筑. 2023(01): 141-143 . 百度学术
6. 王柳江，刘啸宇，刘斯宏，扎西顿珠，沈超敏. 改进hhu-SH模型及其在面板堆石坝工程中的应用. 河海大学学报(自然科学版). 2023(02): 64-72 . 百度学术
7. 陈榕，武智勇，郝冬雪，高宇聪. 高应力下石英砂三轴剪切颗粒破碎演化规律及影响. 岩土工程学报. 2023(08): 1713-1722 . 本站查看
8. 迟世春，郭宇，马锡钰，贾宇峰. 颗粒流变破碎与堆石料流变应变计算. 水力发电. 2023(10): 77-84+91 . 百度学术
其他类型引用(8)
计量
- 文章访问数: 0
- HTML全文浏览量: 0
- PDF下载量: 0
- 被引次数: 16
下载:
