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- W567579771 abstract "The gravity base platform (GBS) at Troll will be founded on soft clay at a water depth of 300 meters, which is deeper than any existing GBS. For an optimised GBS at such depth, the design is governed by dynamics more than by bearing capacity, and good dynamic soil models are essential. In this paper, a new procedure to compute the dynamic stiffness is presented. The procedure couples a recently developed effective stress description of cyclic soil stiffness and stiffness degradation with models for cyclic pore pressure generation and pore pressure dissipation. The cyclic stiffness model uses the current effective stress level as a state for cyclic degradation. The stiffness also reduces with increasing cyclic shear mobilisation. Parameters for the model have been determined based on cyclic triaxial tests on Troll clay samples. The model is discussed in terms of kinematic hardening. The cyclic hysteresis loops from the model are compared with laboratory results. The pore pressure generation model can take into account varying cyclic shear stress amplitudes, and uses the generated excess pore pressure as a memory parameter when changing from one cyclic amplitude to another. The concept is implemented in finite element models and applied to the Troll platform. Nonlinear force-displacement and moment-rotation backbone curves are computed, to be applied as input to a nonlinear structural dynamic analysis." @default.
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- W567579771 date "1992-01-01" @default.
- W567579771 modified "2023-10-05" @default.
- W567579771 title "EFFECTIVE STRESS CONCEPT FOR DYNAMIC STIFFNESS OF CLAY" @default.
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