基于离心试验和数值模拟的加翼单桩水平承载性能研究  

Centrifuge model tests and numerical simulations of horizontal bearing behaviors of monopiles with wings

作　　者：李波[1] 李炜 LI Bo;LI Wei(Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources,Changjiang River Scientific Research Institute,Wuhan 430010,China;HYDRO CHINA Huadong Engineering Corporation,Hangzhou 310014,China)

机构地区：[1]长江科学院水利部岩土力学与工程重点实验室,湖北武汉430010 [2]中国电建集团华东勘测设计研究院有限公司,浙江杭州310014

出　　处：《岩土工程学报》2022年第S02期211-214,共4页Chinese Journal of Geotechnical Engineering

摘　　要：采用离心模型试验和三维有限元法,探讨海上风机基础的大直径单桩及加翼单桩的水平承载性能。共进行3组离心模型试验,得到层状地基中不同翼板长度的水平承载性能随分级加载过程的变化曲线,以及相应的桩身弯矩分布规律。基于离心模型试验的基本参数建立三维有限元模型,采用层状地基模拟离心场中地基的特性。计算结果与离心模型测试结果的对比验证模型建立的合理性,并进一步研究地层特性对加翼单桩的水平承载性能的影响。研究结果表明:大直径单桩基础加装稳定翼后,能充分发挥近地表浅层土的土抗力,可显著提高单桩基础的水平承载性能;增大翼板长度,可有效提高其水平承载力。The horizontal bearing behaviors of a large-diameter monopile and that with wings for offslore wind turbines are studied through the centrifuge tests and three-dimensional finite element methods.Three centrifugal model tests are conducted on the purpose of exploring the variation curves of the horizontal bearing capacity of the monopiles with different wings during the stepped horizontal loading process,and the distribution laws of their bending moment.Based on the fundamental parameters of the centrifugal model tests,three-dimensional finite element models are established to carry out the comparison with the results of the centrifuge tests.The layered foundation is adopted to factually simulate the strength features of foundation in the centrifuge field.Comparison of the calculated results with the measured results of the centrifugal model tests identifies the rationality of the established model.Furthermore,the effects of the foundation properties on the horizontal bearing capacity are studied through the numerical method.The results show that the horizontal bearing behaviors of the large-diameter monopile with wings are much more than those without wings because of the full use of the soil resistance of the shallow layer of the foundation.Increasing the length of the wing plate can effectively improve its horizontal bearing capacity.

关 键 词：桩基 风机基础 水平承载力 离心模型试验 三维有限元 

分 类 号：TU473[建筑科学—结构工程]