砂土中裙式吸力基础复合承载特性数值模拟  

Numerical Simulation of Bearing Characteristics of Modified Suction Caissons in Sand under Combined Loads

作　　者：张雨坤[1] 王冲冲 李大勇[1,2] 亓义菘 ZHANG Yu-kun;WANG Chong-chong;LI Da-yong;QI Yi-song(Shandong Provincial Key Laboratory of Civil Engineering Disaster Prevention and Mitigation,Shandong University of Science and Technology,Qingdao 266590,China;College of Civil Engineering,Fuzhou University,Fuzhou 350108,China)

机构地区：[1]山东科技大学,山东省土木工程防灾减灾重点实验室,青岛266590 [2]福州大学土木工程学院,福州350108

出　　处：《科学技术与工程》2021年第4期1515-1521,共7页Science Technology and Engineering

基　　金：国家自然科学基金(51879044,51808325);山东科技大学科研创新团队支持计划(2015TDJH104)。

摘　　要：海上风电基础在服役过程中,长期受到上部结构传递的竖向荷载以及风、波浪等产生的水平荷载及倾覆力矩作用。这些荷载同时作用于基础,导致基础的复合承载特性复杂。针对海上风电裙式吸力基础开展数值模拟,研究裙式吸力基础在复合加载条件下的承载能力:在复合加载条件下,裙式吸力基础的承载能力更大;随着裙结构宽度和高度的增大,裙式吸力基础的复合承载力逐渐增大;绘制了吸力基础在二维复合荷载(竖向荷载-水平荷载、竖向荷载-弯矩荷载、水平荷载-弯矩荷载)作用情况下的破坏包络线图形以及在三维复合荷载(竖向荷载-水平荷载-弯矩荷载)作用情况下的破坏包络面,得到了裙式吸力基础破坏表达式,可指导工程实践。The offshore wind turbine foundation encounters vertical loads from the upper structure and horizontal loads and overturning moments generated by wind and waves.These loads often act on the wind power foundation simutaneously,resulting in a very complex bearing capacity of the foundation.Numerical simulation was conducted to investigate the bearing capacity of the modified suction caissons under the combined loading.It is found that the combined bearing capacity of the modified suction caissons is significantly larger than the traditional suction foundation.With the increase of skirt width and skirt height,the combined bearing capacity of the modified suction caissons also increases.The failure envelope of the suction foundation under the two-dimensional combined load(vertical load-horizontal load,vertical load-moment,moment-horizontal load)is drawn.In addition,the failure envelope surface under the three-dimensional combined load(vertical load-horizontal load-moment),the expression of the skirt suction foundation damage is obtained for engineering practice.

关 键 词：裙式吸力基础 数值模拟 复合荷载下的承载力 破坏包络线 

分 类 号：TU476.9[建筑科学—结构工程]