海上风电大直径单桩自沉与溜桩分析  

Statistical Analysis of Self-Weight Penetration and Pile Running for Large Diameter Monopiles in Offshore Wind Farm

作　　者：王洪庆 孙伟 刘东华 任灏 汤东升 方辉[3] WANG Hongqing;SUN Wei;LIU Donghua;REN Hao;TANG Dongsheng;FANG Hui(China Energy Engineering Group Guangdong Electric Power Design Institute Co.,Ltd.,Guangzhou 510663,Guangdong,China;Fugro(Hong Kong)Engineering Consulting Co.,Ltd.,Hong Kong 999077,China;Ocean University of China,Qingdao 266100,Shandong,China)

机构地区：[1]中国能源建设集团广东省电力设计研究院有限公司,广东广州510663 [2]辉固(香港)工程顾问有限公司,中国香港999077 [3]中国海洋大学,山东青岛266100

出　　处：《南方能源建设》2023年第1期64-71,共8页Southern Energy Construction

基　　金：广东省促进经济发展专项基金“基于大数据的海上风电场支撑结构强度与疲劳实时评估研究”(粤自然资源合[2019]019)。

摘　　要：[目的]为了能够更加准确、快捷地预测海上大直径单桩的自沉深度,降低施工风险,分别采用了基于设计参数的方法和基于CPT原位测试的方法进行分析计算并根据现场实际施工数据进行初步分析。[方法]通过API推荐的桩基承载原理,利用现场沉桩数据,结合误差分析,将理论计算结果与实际沉桩数据进行比较,修正设计输入参数。[结果]分析结果表明:计算粘土的自沉与溜桩分析过程中,折减强度系数Sr的不同,对沉桩预测差异很大;同时,自沉过程与溜桩过程折减强度系数Sr的选取不同。[结论]通过对比分析,得到了广东沿海海域粘土强度折减系数Sr取值范围,可以为后面海上沉桩作业提供设计参考,此外,研究发现利用CPT数据能够更好地预测自沉和溜桩现象。[Introduction]This paper adoptes the methods based on parametric study and CPT in-situ test for analysis and calculation,the preliminary analysis is carried out according to the actual construction data.By doing this,the self-weight penetration of monopiles can be better and faster predicted and the risks in monopile installation are significantly reduced.[Method]Modified the design input parameters by API recommended pile capacity theory,combined with error analysis,the predicted self-weight penetration was compared to the real data on site.[Result]The analysis results show that there is a great difference in prediction of self-weight penetration due to the different reduction strength coefficient Srin the process of calculating clay self-weight penetration and pile running analysis.At the same time,the selection of reduction strength coefficient is different between the self-weight penetration and pile running process.[Conclusion]Through comparative analysis,the value range of clay strength reduction coefficient Srof Guangdong sea area is obtained,which can provide a design reference for the following offshore pile penetration operations.It’s also proved that the CPT can be used to better predict self-weight penetration and pile running phenomenon.

关 键 词：海上风电 大直径单桩 自沉 溜桩 土阻力 

分 类 号：TK89[动力工程及工程热物理—流体机械及工程] TU473.1[建筑科学—结构工程]