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Lateral Capacity of Suction Caissons in Anisotropic, Purely Cohesive Soil

Author: ShenQunZuo
Tutor: WangDong
School: Dalian University of Technology
Course: Geotechnical Engineering
Keywords: Suction caisson Anisotropic Finite Element Horizontal bearing capacity
CLC: TU442
Type: Master's thesis
Year: 2007
Downloads: 80
Quote: 3
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Abstract

Suction caisson is a top closed thin-walled, large-diameter barrel infrastructure, commonly used in the deep-sea mooring floating oil platform. This new form the basis for the first time since 1981 in the European North Sea the GORM oilfield development has so far the suction caissons distributed more than 485 in over 50 waters. The suction caisson platform as a floating base typically withstand the pull of the horizontal direction. The use of model experiments so far, many domestic and foreign scholars, horizontal load limit analysis and finite element method under suction caissons or stability of bucket foundation to explore, but they focus on the isotropic soil and slender caissons research, ignoring the actual situation of the anisotropic characteristics of the soil and stubby caisson is widely used in coastal waters. Suction caissons to expand from two aspects: the combination the strength update algorithm with correction Hill anisotropic model to simulate anisotropic soil suction caisson soil interaction; examine the level of load under the rough the shorter caisson and slender caisson ultimate bearing capacity analysis caisson aspect ratio, Weight of Soil and next to the compressive strength values ??of discrete factors such as the ultimate bearing capacity. Hill elastoplastic model based on the introduction of the strain rate parameters, the parameters of the positive and negative strain rate is divided into the surrounding soil of the caisson triaxial extension and triaxial compression region. The subroutine interface provided by the ABAQUS, updated soil unit triaxial compressive and tensile strength. Finite element analysis of failure mode analysis for comparison, between the caissons lateral bearing capacity and caisson soil of interaction are in good agreement with the upper limit on the intensity of correction Hill anisotropic model update algorithm can correctly simulate the suction caisson foundation mechanical properties. The limit analysis needs presupposes failure mode, and only adapted explore slender caissons soil interactions. Finite element analysis need not assume that the failure mode, but also to consider the different test methods undrained coupling strength index, and therefore adapt to the aspect ratio of the caisson, at the same time you can change in the next parameter investigated compressive strength of horizontal ultimate bearing capacity the impact. By numerical simulation of the four typical anisotropic soil suction caisson chunky the caisson and slender caissons have different failure modes, slender caissons rotation destruction stubby caisson approximate translational destruction. The analysis of horizontal bearing capacity factor with L / D ratio curve when L / D> 1, the bearing capacity factor increases with increasing L / D, L / D <1, the bearing capacity coefficient of L / D increases. Anisotropic horizontal bearing capacity of the foundation and the pressuremeter strength index is closely related. Changes in parameters pressuremeter strength and the approximate range of undrained simple shear strength, strength anisotropy sharpest impact on the level of carrying capacity does not exceed 24%.

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