Abstract

Double suction plate anchor is consisted of two small suction anchors and plate. Multi-anchor has an advantage that they can withstand the horizontal load and moment and designed the structure stiffer. The simulations have been conducted for the bearing capacity of double suction plate anchor in clay with CEL(Coupled Eulerian-Lagrangian) Method and Standard analysis. The bearing capacity between CEL Method and Standard analysis were compared and evaluated. CEL Method cannot depict the effect of suction pressure. To improve this limitation, this research adopted the concept of the mobilized factor as 0.15 to 0.45 from Cho et al. (2000) and the adhesion factor as 0.2 to 0.5 from API (2005). The decreased cohesion of clay means the soil strength reduction due to the water flow caused by the applied suction pressure during installation. In this research, the simulations have been conducted for estimating the behavior of double suction plate anchor using CEL Method with decreased cohesion. Based on the results, the capabilities of the new CEL approach are evaluated and validated.

Introduction

As offshore floating structures get enlarged, the suction anchors or buckets as foundations of offshore floating structures are demanded to withstand heavy loads. Therefore, the size of suction anchor becomes large. A suction anchor is a hollow circular tube closed by a lid at the upper end. It resembles an upturned can. The anchor lid can be a stiffened flat plate. Suction anchors are installed in to the desired depth by first allowing them to penetrate into soil under their self-weight. The water is pumped out of the anchor interior, which creates a net pressure difference across the lid that penetrates the caisson into soil to the targeted depth (Tran, 2005). Suction anchor has many advantages over traditional methods. A significant advantage of suction anchors is cost effectiveness (Tjelta, 2001; Bussmaker, 2005). This cost includes geotechnical investigation cost, steel and fabrication cost, and installation cost (Feld et al, 1991; Feld, 2001, Tran, 2005).

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