The study of effective stress and pore water pressures in the foundation of a concrete gravity platform affected by loads due to waves, currents and wind in the Persian Gulf

Authors

1 Department of Marine structure Engineering, graduate school of Marine Science and Technology , Science and Research Branch , Islamic Azad University, Tehran, Iran

2 Iranian National Institute for Oceanography, Iran

3 Science and Research Branch Islamic Azad University Tehran, Iran

Abstract

It is proposed to use a single base platform in the Persian Gulf considering its low depth and more appropriate environmental conditions in comparison to North Sea and Mexico Gulf where this kind of platform is very popular. The pile of platform is responsible for transmission of environmental loads resulted from waves, currents, wind and dead loads to foundation of platform. Using SACS 5.3 software, we woke modeling of waves, currents and wind forces, stood the load combination resulted from these forces on the concrete pile and read for anchors analyzed by the software. Considering wave load is more important than wind and current loads, it is a prevailing load in load combination design. After changing the wave load design, we saw changes in anchor and force of pile. We used a concrete square basis of 1 depth in order to design foundation. After modeling the above mentioned basis by PLAXIS.3D FUNDATION software, forces and anchors resulted from load combination of currents, waves and wind. Layering and seabed soil type in the Persian Gulf is one of the most important parts in foundation design. Soil laboratory determined the kind of sea bed soil. These tests were done both as field tests and as laboratory tests carried on samples collected from the site. After modeling foundation and analyzing it, we read the stress under the foundation and pore water pressure and then compared it with environmental loads.

Keywords