摘要
埕北地区海洋水动力环境复杂,在风、波浪、海流等环境因素作用下会引起海上构筑物周围的土体产生冲刷和淘蚀。采用有限元法对冲刷作用对桩基竖向承载力产生的影响进行分析,结果表明,当桩靴在表层粉土较厚(地层结构为厚层粉土—软弱粉质黏土型)的区域就位时,如果选择表层粉土层作为桩靴持力层,冲刷作用将对桩基承载能力产生显著的不利影响,造成持力层有效厚度的减小以及桩靴入土深度变浅,进而导致桩基承载力下降,造成桩脚额外贯入甚至引发刺穿失稳。
The hydrodynamic environment of the Chenbei area is very complex. The joint action of wind, wave, current and other environmental factors will cause erosion or scouring around the drilling platform piles. The finite element analysis suggests that in the area with thick layer of silt overlying soft silty clay, if we choose the thick layer of silt as the pile shoes bearing layer, the scouring process should have significant effect on its bearing capacity. The pile shoe penetration depth and the thickness of effective bearing layer will reduce and the bearing capacity of the foundation will decrease, that will cause extra penetration and/or instability.
出处
《海洋地质前沿》
2013年第9期54-58,共5页
Marine Geology Frontiers
基金
胜利石油管理局重点科技攻关项目"胜利海区地基土对自升式平台桩基作用的响应研究"(GKZ1215)
关键词
桩基
承载力
冲刷
有限元分析
pile foundation
bearing capacity
scour
finite element analysis
