摘要
裙式吸力基础作为海洋平台的基础可以有效地提高基础承载力和减小其侧移量。基于数值模拟研究了6个荷载作用位置以及6种荷载作用角度影响下,分层土中裙式吸力基础的倾斜抗拔承载特性及土体变形规律。结果表明:裙式吸力基础的倾斜抗拔承载力随荷载作用点深度的增加呈现先增大后减小;不同荷载作用角度下,最大倾斜抗拔承载力时的荷载作用点位于基础顶面以下0.50~0.57倍基础埋深处;在不同荷载作用点处吸力基础的倾斜抗拔承载力与荷载作用角度均呈反比的规律;随着荷载作用角度的增大,极限状态下,基础周围土体滑动面与水平方向夹角也逐渐增大。
As the foundation of offshore platform, modified suction caisson(MSC) can effectively increase the bearing capacity and reduce the lateral deflection. Numerical simulations were conducted to investigate the inclined bearing capacity of MSC in layer soil. The effects of the loading point position and the loading angle(i.e. the angle between the loading direction and the vertical direction) on the inclined bearing behavior were discussed. Results showed that the inclined bearing capacity of the MSC first increased to the maximum value with increasing the loading point embedded depth, then decreased with future increase the loading point embedded depth. The maximum inclined bearing capacities under various loading angles were obtained when the loading point embedded depth equals 0.5-0.75 times of the MSC length. In addition, it was also found that the inclined bearing capacity of the MSC decreases with increasing the loading angle. In the limit state, the angle between the ground surface and the slip surface of the MSC increases with increase of the loading angle.
作者
王栋林
李大勇
张雨坤
WANG Donglin;LI Dayong;ZHANG Yukun(Shandong Provincial Key Laboratory of Civil Engineering Disaster Prevention and Mitigation,Shandong University of Science and Technology,Qingdao 266590,China;College of Civil Engineering and Architecture,Shandong University of Science and Technology,Qingdao 266590,China;College of Civil Engineering,Fuzhou University,Fuzhou 350116,China)
出处
《人民长江》
北大核心
2020年第2期166-171,共6页
Yangtze River
基金
国家自然科学基金资助项目(51879044,51808325)
山东科技大学科研创新团队资助项目(2015TDJH104)。
关键词
裙式吸力基础
倾斜抗拔承载力
荷载作用点
荷载作用角度
土体变形
skirted suction caisson
inclined uplift bearing capacity
load attachment point
load action angles
soil deformation
