As Qikou 17-2 platform with bucket foundation and Bohai 8th self-elevating drilling ship for example

it was simulated by three steps for the extracting of pile shoe of drilling ship by using general purpose finite element program ANSYS

using 3D 8-node element and Drucker-Prager elastoplastic stress-strain theory. When the distance between pile shoe and bucket was certain

considering the sensitivity of soil parameters

three-dimensional finite element analysis of the influence on foundation strength of bucket foundation during pile pulling was carried out. It is shown that the effect on ground bearing capacity of platform caused by pile pulling of drilling ship is reducing with the decreasing of relative stiffness and the increasing of internal friction angle and cohesive strength; among natural parameters of foundation soil

as far as the effect on ground bearing capacity of bucket edge soil due to changes of elastic modulus

internal friction angle and cohesive strength is concerned; the effects regularity of the frontal two parts are more obvious than that of the latter one.