波浪에 의한 海底 配管에 미치는 地盤 液狀化 및 海底斜面 安定性에 대한 硏究

Abstract

In this study, the liquefaction and slope stability of seabed at nearshore is discussed, which is divided with none breaking and breaking wave based on the viewpoint of marine geotechnical and pipeline engineering.

A submarine pipeline buried in sandy seabed could be floated since sandy seabed is easy to be liquefied and unstabilized on the slope of seabed resulting from the change of the effective stresses of pipeline due to hydrodynamic pore pressure induced by oscillation of wave profile, which can cause the unstability of submarine pipeline during its life.

Also, the seabed slope stability should be analyzed due to various wave profile. If seabed could not secure the stability of certain section, structural and external stability of submarine pipeline cannot be secured due to the movement of seabed, which brings out many issues from the aspect of environmental and functional.

Therefore, the effect from the view of stability of the seabed should be reviewed regarding the stability of seabed.

Accordingly, the stability of environmental and structural of submarine pipeline should be secured, by securing and reviewing the submarine pipeline flotation and the stability of seabed slope at the initiatory stage.

In deciding waveform, applying the profile of Airy, Cnoidal, Stock's Solitary and Stream function, it shall be based on vs .

In the wave profile theories mentioned above, by analysing the hydrodynamic pressure and calculating the pore pressure that acts depending on the depth of the ground, the seabed soil liquefaction, flotation and slope stability will be reviewed. In addition, the flotation should be reviewed as an effect done on the buoyancy of submarine pipeline induced by the pore pressure even if the liquefaction does not happen of the seabed.

There is no impact on the submarine pipeline induced by the collapse of seabed, as long as there is no problem of the overall stability of slope even if there is a sectional problem of stability in the review of seabed stability of slope.

Therefore, this study is to confirm the effect and additional measure to consider so as to secure the flotation of submarine pipeline and slope stability of seabed, and liquefaction of seabed-related, by explaining the essential hydrodynamic load.