Causes of post-installation penetration of jack-up spudcan foundations in clays.
Causes of post-installation penetration of jack-up spudcan foundations in clays.
复制标题
自升式桩桩基础在粘土中安装后渗透的原因
DOI：
10.1371/journal.pone.0206626
复制
发表时间：
2018
期刊：
影响因子：
3.7
通讯作者：
Lee FH
中科院分区：
文献类型：
--
作者：
Li YP;Yang Y;Yi JT;Ho JH;Shi JY;Goh SH;Lee FH
本文采用离心模型试验和小应变有限元分析相结合的方法，研究了预压后产生附加沉降的可能原因，其中考虑了空洞塌陷引起的沉降、固结沉降和循环荷载引起的沉降。对墨西哥湾七座自升式钻井平台的反分析表明，在大多数情况下，即使是完全的空腔坍塌也只能解释部分测量到的额外沉降。小应变有限元分析还表明，在所考虑的场地中，砂箱固结沉降可能比空腔塌陷更少地占额外沉降。另一方面，离心模型试验表明，大幅度的循环摇摆对锚碇沉降有非常显著的影响，即使一半的预载荷已经被移除。然而，这种效应不能用屈服包络线的不确定性来解释，因为荷载组合没有超过屈服包络线。一种可能的解释是在循环荷载下土壤的刚度和强度退化。有鉴于此，在预加载后不久预计会出现大幅循环摇摆（如风暴荷载引起的摇摆）的情况下，建议采用保守方法。格腿的存在被发现，以减少在大振幅周期摇摆过程中的drocan沉降。
This paper examines possible causes of additional spudcan settlement after preloading using both centrifuge model tests and small strain finite element analysis, in which spudcan settlement due to cavity collapse, consolidation settlement and settlement due to cyclic loading are incorporated. Back-analyses of seven jack-up rigs in the Gulf of Mexico show that even complete cavity collapse could only explain part of the measured additional settlements in the majority of the cases. Small strain finite element analyses also show that spudcan consolidation settlement is likely to account for even less of the additional settlement than cavity collapse in the sites considered. On the other hand, centrifuge model tests show that large amplitude cyclic rocking has a very significant effect on spudcan settlement, even if half of the preload has been removed. However, this effect cannot be explained by the exceedance of the yield envelope since the loading combination had not exceeded the yield envelope. One possible explanation is the stiffness and strength degradation of the soil under cyclic loading. In view of this, a conservative approach is recommended in instances where large amplitude cyclic rocking, such as that arising from storm loading, is expected shortly after preloading. The presence of lattice legs is found to reduce the spudcan settlement during large amplitude cyclic rocking.
登录
查看更多内容
影响因子：
5.8
作者：
Hossain, MS;Hu, Y;White, DJ
通讯作者：
White, DJ
影响因子：
5.8
作者：
WROTH, CP
通讯作者：
WROTH, CP
DOI：
10.1061/(asce)gt.1943-5606.0000943
发表时间：
2013-12-01
影响因子：
3.9
作者：
Bienen, Britta;Cassidy, Mark Jason
通讯作者：
Cassidy, Mark Jason
影响因子：
5.8
作者：
Houlsby, GT;Martin, CM
通讯作者：
Martin, CM
DOI：
10.1061/(asce)gt.1943-5606.0000054
发表时间：
2009-09-01
影响因子：
3.9
作者：
Hossain, Muhammad Shazzad;Randolph, Mark F.
通讯作者：
Randolph, Mark F.