冲刷作用下两种不同直径的单桩基础循环加载特性
Comparison of Cyclic Loading Behavior of Two Piles with Different Dimeters under Scouring
- 防灾减灾工程学报 2020年40卷第4期 页码：623-632
- 作者机构：
1.同济大学地下建筑与工程系，上海 200092
2.同济大学岩土及地下工程教育部重点实验室，上海 200092
- 作者简介：
于 锋（1988-）,男，博士研究生。主要从事基础工程方面的研究。Email: 15801786702@163.com
张陈蓉（1982-），女，副研究员，博士。主要从事桩基工程的教学与科研。Email: zcrong33@tongji.edu.cn
- 基金信息：国家自然科学基金项目(51779175);上海市科委科研计划项目(18DZ1202104)
DOI：10.13409/j.cnki.jdpme.2020.04.017
中图分类号： TU473.1收稿：2019-12-26，
修回：2020-04-07，
纸质出版：2020-08-15
- 稿件说明：
移动端阅览
于锋,张陈蓉,黄茂松.冲刷作用下两种不同直径的单桩基础循环加载特性[J].防灾减灾工程学报,2020,40(04):623-632.
YU Feng,ZHANG Chenrong,HUANG Maosong.Comparison of Cyclic Loading Behavior of Two Piles with Different Dimeters under Scouring[J].Journal of Disaster Prevention and Mitigation Engineering,2020,40(04):623-632.
于锋,张陈蓉,黄茂松.冲刷作用下两种不同直径的单桩基础循环加载特性[J].防灾减灾工程学报,2020,40(04):623-632. DOI： 10.13409/j.cnki.jdpme.2020.04.017.
YU Feng,ZHANG Chenrong,HUANG Maosong.Comparison of Cyclic Loading Behavior of Two Piles with Different Dimeters under Scouring[J].Journal of Disaster Prevention and Mitigation Engineering,2020,40(04):623-632. DOI： 10.13409/j.cnki.jdpme.2020.04.017.
摘要
海上风电大直径单桩基础长期承受来自环境效应的循环荷载以及海床的冲刷作用，冲刷条件下的水平受荷单桩的循环加载特性是海上风电桩基础设计关注的内容。开展了砂土中大直径和小直径单桩基础冲刷条件下长期循环加载的模型试验，探讨了冲刷深度和循环加载幅值对两种基础形式长期承载变形特性的影响。试验研究表明：砂土中循环加载提高了循环后的单桩承载力，其中小直径桩循环后的水平承载力提高更为显著。冲刷导致循环后的单桩承载力下降，随着冲刷深度增加该效果越明显。在循环加载初期，小直径桩残余累积变形的增加速度小于大直径桩。循环次数大于1 000次冲刷深度为2倍桩径条件下，小直径桩的累积变形趋于稳定，大直径桩的累积变形仍继续发展。通过在无量纲循环加载幅值参数中引入冲刷深度对承载力的影响，建立了冲刷条件下两种不同直径桩基的水平循环累积位移计算模型，适用于考虑冲刷影响的单桩长期水平循环累积变形预测。
Abstract
The monopile for offshore wind turbine sustains long-term cyclic load due to environment and scouring in the seabed. The long-term cyclic loading behavior of the pile foundation under scouring is an important problem in the design of monopile for an offshore wind turbine. Laboratory model tests were conducted to investigate the performance of a large diameter pile and a small diameter pile in sand subjected to scouring and long term lateral cyclic loadings
in which the influence of scour depth and cyclic loading amplitude on the long-term behavior of the two foundations was discussed. The test results show that the applied cyclic loading improves the post-cyclic capacity of single pile
especially for the small diameter pile. Scour leads to the reduction of post-cyclic capacity of single pile
the effect of which increases with the scour depth. Comparing with the large diameter pile
the increment of residual cumulative deformation of the small diameter pile is smaller in early cyclic loading stage. When the cycle number is larger than 1000 and the scouring depth is twice of the pile diameter
the development of the cumulative deformation of the small diameter pile approaches to be stable
while a further development of deformation appears in the large diameter pile. By bringing the scour affected capacity into the dimensionless cyclic loading amplitude parameters
the lateral cyclic cumulative displacement calculation model of the two kinds of piles under scouring is established
which is applicable to the prediction of long-term lateral cyclic cumulative deformation of single pile considering scouring.
关键词
Keywords
references
Kim K , Nam B H , Youn H . Effect of cyclic loading on the lateral behavior of offshore monopiles using the strain wedge model [J]. Mathematical Problems in Engineering 2015 : 1 - 12 .
Prendergast L J , Gavin K . A review of bridge scour monitoring techniques [J]. Journal of Rock Mechanics and Geotechnical Engineering , 2014 , 6 ( 2 ): 138 - 149 .
胡安峰 , 张光建 ， 贾玉帅 , 等 . 刚度衰减模型在大直径桩累积侧向位移分析中的应用 [J]. 浙江大学学报(工学版) , 2014 , 48 ( 4 ): 721 - 726 .
Hu A F , Zhang G J , Jia Y Sh , et al . Application of degradation stiffness model in analysis of cumulative lateral displacement of monopile foundation [J]. Journal of Zhejiang University (Engineering Science) 2014 , 48 ( 4 ): 721 - 726 . (in Chinese)
张 勋 , 黄茂松 , 胡志平 . 砂土中单桩水平循环累积变形特性模型试验 [J]. 岩土力学 , 2019 , 40 ( 3 ): 933 - 941 .
Zhang X , Huang M S , Hu Zh P . Model tests on cumulative deformation characteristics of a single pile subjected to lateral cyclic loading in sand [J]. Rock and Soil Mechanics , 2019 , 40 ( 3 ): 933 - 941 . (in Chinese)
张 宇 , 王忠涛 , 赵守正 . 双向水平循环荷载下单桩承载力的离心模型实验 [J]. 水利与建筑工程学报 , 2014 , 12 ( 4 ): 27 - 31 .
Zhang Y ， Wang Zh T ， Zhao Sh Zh . Centrifugal tests of single pile’s bearing capacity subjected to bidirectional cyclic lateral loading [J]. Journal of Water Resources and Architectural Engineering , 2014 , 12 ( 4 ): 27 - 31 . (in Chinese)
朱 斌 , 熊 根 , 刘晋超 , 等 . 砂土中大直径单桩水平受荷离心模型试验 [J]. 岩土工程学报 ， 2013 , 35 ( 10 ): 1 807 - 1 815 .
Zhu B , Xiong G , Liu J Ch , et al . Centrifuge modelling of a large-diameter single pile under lateral loads in sand [J]. Chinese Journal of Geotechnical Engineering , 2013 , 35 ( 10 ): 1 807 - 1 815 . (in Chinese)
陈仁朋 , 顾 明 , 孔令刚 , 等 . 水平循环荷载下高桩基础受力性状模型试验研究 [J]. 岩土工程学报 ， 2012 , 34 ( 11 ): 1 990 - 1 996 .
Chen R P , Gu M , Kong L G , et al . Large-scale model tests on high-rise platform pile groups under cyclic lateral loads [J]. Chinese Journal of Geotechnical Engineering , 2012 , 34 ( 11 ): 1 990 - 1 996 . (in Chinese)
胡 丹 , 李 芬 , 张开银 . 冲刷作用下单桩水平承载特性试验研究及数值模拟 [J]. 水利学报 , 2015 ( 增1 ): 271 - 274 .
Hu D ， Li F ， Zhang K Y . Experiment on the lateral load capacity of single piles under scour conditions [J]. Shuili Xuebao , 2015 ( Sup 1 ): 271 - 274 . (in Chinese)
杨少磊 , 马宏旺 . 考虑冲刷情况下海上风电单桩基础优化设计研究 [J]. 海洋技术学报 , 2018 , 37 ( 1 ): 74 - 80 .
Yang Sh L , Ma H W . Study on the optimum geometry of offshore wind turbine monopiles unprotected against scour [J]. Journal of Ocean Technology , 2018 , 37 ( 1 ): 74 - 80 . (in Chinese)
杨晓峰 , 张陈蓉 , 黄茂松 , 等 . 砂土中单桩基础冲刷的修正应变楔计算 [J]. 地震工程学报 , 2016 , 38 ( 4 ): 549 - 553 .
Yang X F , Zhang Ch R , Huang M S , et al . Modified strain wedge calculation of single pile in sand under scour [J] . China Earthquake Engineering Journal , 2016 , 38 ( 4 ): 549 - 553 . (in Chinese)
戴国亮 , 代 浩 , 杨炎华 , 等 . 冲刷作用下水平承载单桩计算方法及承载特性 [J]. 中国公路学报 , 2018 , 31 ( 8 ): 104 - 112 .
Dai G L , Dai H , Yang Y H , et al . Computation method and bearing characteristic of lateral bearing single pile foundation under scour condition [J]. China Journal of Highway Transportation , 2018 , 31 ( 8 ): 104 - 112 . (in Chinese)
蒋建平 , 陈文杰 , 杨 栓 . 局部冲刷对部分埋入单桩水平承载性状的影响 [J]. 水利水运工程学报 , 2017 ( 3 ): 64 - 70 .
Jiang J P ， Chen W J ， Yang Sh . Impacts of local scour on lateral bearing behavior of partially embedded single piles [J]. Hydro-Science and Engineering , 2017 ( 3 ): 64 - 70 . (in Chinese)
漆文刚 , 高福平 . 冲刷对海上风力机单桩基础水平承载特性的影响 [J]. 中国科学:物理学力学天文学 , 2016 , 46 ( 12 ): 124710 .
Qi W G , Gao F P . Effects of scour on horizontal bearing behavior of monopile foundations for offshore wind turbines [J]. Scientia Sinica Physica , Mechanica & Astronomica , 2016 , 46 ( 12 ): 124710 . (in Chinese)
Kuo Y S , Achmus M , Kao C S . Practical design considerations of monopile foundations with respect to scour [C]∥Proceedings of the 4th Global Wind Energy Conference and Beijing International Wind Energy Conference. Beijing, China:[s.n.] , 2008 .
Achmus M , Kuo Y S , Abdel-Rahman K . Numerical investigation of scour effect on lateral resistance of windfarm monopiles [C]// The Twentieth International Offshore and Polar Engineering Conference . International Society of Offshore and Polar Engineers, Beijing, China :[s.n.], 2010 .
梁发云 , 李彦初 , 陈海兵 . 冲刷作用下单桩循环加载特性的模型试验 [J]. 同济大学学报(自然科学版) , 2014 , 42 ( 10 ): 1 511 - 1 515 .
Liang F Y , Li Y Ch , Cheng H B . Influence of scour depth on vertically cyclic behaviors of single pile with model tests [J]. Journal of Tongji University (Natural Science) , 2014 , 42 ( 10 ): 1 511 - 1 515 . (in Chinese)
Poulos H G , Hull T . The role of analytical geomechanics in foundation engineering [C]∥ Proceedings of the 1989 Foundation Engineering Conference . Evanston, Illinois , 1989 : 1 578-1 606 .
Leblanc C , Houlsby G Y , Byrne B W . Response of stiff piles in sand to long-term cyclic lateral loading [J]. Géotechnique , 2010 , 60 ( 2 ): 79 - 90 .
Zhu B , Li T , Xiong G , et al . Centrifuge model tests on laterally loaded piles in sand [J]. International Journal of Physical Modelling in Geotechnics , 2016 , 16 ( 4 ): 160 - 172 .
Long J , Vannestev G . Effects of cyclic lateral loads on piles in sand [J]. Journal of Geotechnical Engineering , 1994 , 120 ( 1 ): 225 - 244 .
Lin S S , Liao J C . Permanent strains of piles in sand due to cyclic lateral loads [J]. Journal of Geotechnical and Geoenvironmental Engineering , 1999 , 125 ( 9 ): 798 - 802 .
0
浏览量
0
下载量
1
CSCD
- 网络PDF下载
- WORD下载
- Meta-XML下载
- BibTeX下载
- Endnote下载
- RefMan 下载
- NoteExpress下载
- NoteFirst下载
关联资源
相关文章
相关作者
相关机构
- 技术支持由北京北大方正电子有限公司提供 苏ICP备05012539号-11
苏公网安备32010202012147号 - 本系统建议在Chrome、 IE9+ 以上版本浏览器阅读本站内容，360浏览器请切换至极速模式
- Cookies帮助我们提供服务并提供个性化体验。使用本网站，即表示您同意我们使用Cookies
