MECHANISM ANALYSIS OF HORIZONAL LIMIT BEARING OF RIGID MONOPILE ON SLOPE SEABED
The failure mechanism of horizontally loaded rigid monopile on slope seabed is investigated by using 3-D limit analysis software Optum G3.The failure mechanism and ultimate bearing capacity of monopile with various aspect ratios,pile-soil interface friction coefficient,soil strength and slope angles are analyzed.It is found that when the aspect ratio of monopile is small,the failure modes mainly include wedge failure at shallow seabed and spherical failure in deep soil.With the increase of aspect ratio of the monopile,the full flow failure mode appears between wedge failure and spherical failure.With the further increase of aspect ratio,another full-flow failure mode is formed below the spherical failure mode.The corresponding horizontal bearing capacity coefficient(Np)firstly decreases and then increases with the increase of aspect ratio of monopile,and finally keeps constant.Furthermore,the factor Np increases with the increase of friction coefficient and loading angle,but decreases with the increase of soil strength gradient and slope angle.Additionally,the factor Np of the single-sided failure mode is smaller than that of two-sided failure mode,indicating that it is safer to design the ultimate bearing capacity of the monopile according to the single-sided failure mode.
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