Abstract
In deep water, pipelines are usually laid directly on the seabed. During the laying process, the pipe typically penetrates into the seabed by a fraction of a diameter. The vertical embedment of pipeline and formation of berm during penetration have a significant effect on the pipeline stability. This study aims to investigate the vertical pipeline penetration at uniform and normal consolidated clay, by carrying out a series of numerical analyses, in which the coupled Eulerian-Lagrangian method (CEL) is incorporated to enable large deformation simulation. These analyses have been compared with collapse loads calculated using the theory solution. The results show that the CEL method is very suitable for simulating large-deformation pipesoil interaction.
Highlights
Submarine pipe is an important part of offshore oil and natural gas development
The trajectory of the material flowing in the grid is determined by calculating the Eulerian Volume Fraction (EVF) in each cell
The PIP situation of submarine pipe subsidence is studied, the relationship between the subsidence resistance and the subsidence displacement of the submarine pipe in both the non-heavy homogeneous clay and the normal heavy consolidated clay is obtained by using Coupled Euler-Lagrange (CEL) finite element method
Summary
Submarine pipe is an important part of offshore oil and natural gas development. It is no necessary to protect the submarine pipe, so they are not ditched or buried but laid directly on the seabed. For a typical single-hole submarine pipe, its subsidence depth is about 0.1 ~ 0.5 times the pipe diameter during the laying process [1]. During the process of transporting oil and natural gas in the submarine pipe, it is necessary to apply certain temperature and pressure, and the joint action of temperature and pressure causes additional stress in the pipe. The depth of self-subsidence is an important parameter to determine the lateral resistance and analyze the in-situ stability of pipes
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