利用有限元法模拟较大桩靴拔出对筒型基础平台地基的影响

自升式钻井船和筒型基础平台都属于浅基础结构物。在完成钻井作业后 ,桩靴较大的自升式钻井船在拔桩中会对筒型基础平台的地基产生一定的影响。利用通用的有限元程序ANSYS软件 ,以渤海 8号自升式钻井船和歧口 17 2筒型基础平台为对象 ,在相同荷载和约束下分 3步模拟了自升式钻井船桩靴的拔出过程 ,就桩靴在拔出过程中对筒型基础平台地基强度的影响进行了三维有限元分析。分析结果表明 ,在设计中将地基承载力提高 10 % ,自升式钻井船就可以在桩靴距筒型基础筒体 12 5m以外作业

Simulation of influence of biggish pile shoe pulling out on foundation of bucket foundation platform with finite element program

Both jackup drilling rig and bucket foundation platform belong to shallow foundation structures. After drilling, the jackup drilling rig with biggish pile shoes will produce a certain influence on foundation of bucket foundation platform during pile extracting. Taking Qikou 17-2 bucket foundation platform and jackup drilling rig Bohai No.8 as an example, the general-purpose finite element program ANSYS is used to simulate the pile shoe's extracting process of jackup drilling rig by three steps under the same loads and constraints. At the same time, three-dimensional finite element analysis is carried out for the influence on foundation strength of bucket platform produced by pulling out of pile shoes. It is shown that jackup drilling rig can operate normally when the distance between pile shoe and bucket foundation is larger than 12.5 m, as long as bearing capacity of foundation soil increases 10 percent in design.