Abstract
A suction anchor is an appealing anchoring solution for floating production. However, the possible effects of residual pore pressure can be rarely found any report so far in term of the research and design. In this study, the residual pore pressure distribution characteristics around the suction anchor subjected to vertical cyclic loads are investigated in a soft clay seabed, and a three-dimensional damage-dependent bounding surface model is also proposed. This model adopts the combined isotropic-kinematic hardening rule to achieve isotropic hardening and kinematic hardening of the boundary surface. The proposed model is validated against triaxial tests on anisotropically consolidated saturated clays and normally consolidated saturated clays. The analytical results show that the excess pore water pressure accumulates primarily on the outside of the suction anchor, whereas negative pore water pressure mainly on the inside. The maximum values of both sides appear in the lower part of the seabed. According to the distribution characteristics of the residual pore pressure, a perforated anchor is proposed to reduce the accumulation of excess pore water pressure. A comparative study generally shows that the perforated anchor can effectively reduce the accumulation of excess pore water pressure.
Highlights
IntroductionVarious types of offshore platforms are applied for energy production in deep-water environments
Various types of offshore platforms are applied for energy production in deep-water environments.As the water depth increases, the offshore platform that rests upon the seabed and relies on gravity base foundations or traditional pile foundations is uneconomical and impractical
With the increase in the cyclic numbers, excess pore water pressure is developed and accumulated in a soft clay seabed; the soft clay structure is degraded, followed by degradation in strength and a reduction in stiffness [3]. Such a phenomenon may reduce the uplift capacity of the suction anchor, and it is, essential to assess the accumulation of the pore water pressure within the seabed around the suction anchor subjected to vertical cyclic loads
Summary
Various types of offshore platforms are applied for energy production in deep-water environments. Et studied the response of the suction caisson foundations with cyclic loads in soft clay by means of Wallace centrifuge al. The present model is efficient at capturing the development of pore water pressure in vertical cyclic loading conditions. A damage parameter and initial anisotropic tensors are the soft clay seabed subjected to cyclic loads It is validated against available experimental laboratory introduced into the bounding surface model, to represent the remolding of the soil structure and data. According to distribution water pressure in the soft clay seabed subjected to cyclic loads. It is validated against available characteristics of the residual pore pressure, an improved rational structure named the perforated experimental laboratory data. According to distribution ofApproach the residual pore pressure, an improved rational
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