Cyclic Soil Data for Design of Gravity Structures

Andersen, Knut H.; Kleven, Arne; Heien, Dag

doi:10.1061/(asce)0733-9410(1988)114:5(517)

Cited by 117 publications

(40 citation statements)

References 6 publications

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“…The weakening effect of cyclic loading on the strength of soft soil is well recognised in design practice, and methodologies for determining the cyclic 'fatigue' of clay during undrained cyclic loading are well established (Andersen et al, 1988;Andersen, 2015). However, undrained capacity assessments often neglect the effects of drainage and consolidation that will inevitably occur in practice after installation and through long-term operations.…”

Section: Background and Motivationmentioning

confidence: 99%

An effective stress framework for estimating penetration resistance accounting for changes in soil strength from maintained load, remoulding and reconsolidation

2019

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Some offshore foundations are subjected to intermittent episodes of remoulding and reconsolidation during installation and operational processes. The maintained and cyclic loads, and subsequent reconsolidation processes, cause changes in the geotechnical capacity, particularly in soft clays. This changing capacity affects the in-service behaviour, including changes to the safety margin, the extraction resistance, the stiffness and structural fatigue rates and also the overall system reliability. This paper provides a new analysis framework to capture these effects, based on estimation of the changing soil strength. The framework is developed using critical state concepts in the effective stress domain, and by discretising the soil domain as a one-dimensional column of soil elements. This framework is designed as the simplest basis on which to capture spatially varying changes in strength due to maintained and cyclic loads, and the associated remoulding and reconsolidation processes. The framework can be used to interpret cyclic penetrometer tests, as well as foundation behaviour. This provides a basis for the approach to be used in design, by scaling directly from penetrometer tests to foundation behaviour. Centrifuge tests are used to illustrate the performance of this approach. The penetration resistance during cyclic T-bar penetrometer tests and spudcan footing installation with periods of maintained loading and consolidation is accurately captured. The framework therefore provides a basis to predict the significant changes in penetration resistance caused by changing soil strength, and can bridge between in situ penetrometer tests and design assessments of soil-structure interaction.

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Section: Background and Motivationmentioning

confidence: 99%

An effective stress framework for estimating penetration resistance accounting for changes in soil strength from maintained load, remoulding and reconsolidation

2019

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“…Detailed evaluation of the importance of the average and cyclic shear stress components for cyclic behavior is given by (Andersen, 1998) on plastic Drammen Clay. Randoph and Gourvene (2011) also produced such contour diagrams and presented results of the asymmetric cyclic simple shear test performed on normally consolidated Drammen Clay.…”

Section: Design Graphsmentioning

confidence: 99%

Effects of cyclic shear stress and average shear stress on the cyclic loading failure of marine silty sand

Kim

Son

Ryu

et al. 2015

LTI

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This paper presents the cyclic direct simple shear (CDSS) tests to explain the long term cyclic behavior of marine soil deposits. Cyclic behavior of marine soil deposits depend on the number of loading cycles, vertical effective stress, cyclic shear strain amplitude, relative density, and cyclic and average shear stresses. In addition, the study investigates the effect of cyclic and average shear stresses on the cyclic behavior of marine soil deposits subjected to long term cyclic loading. Design graphs are plotted from the CDSS test results. These results are then modeled and can be used to design offshore structures such as offshore wind turbine foundations, and also used to assess the cyclic shear strength of soil beneath the foundation.

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“…Below 26 m, hard clays are interbedded with sand layers to a great depth. In situ cone penetration tests before installation of the tank indicated that the sand was very dense with a relative density of about 100 per cent in the upper few meters [9]. The permeability of the sand in the Eko"sk "eld is of the order of 10\ m/s [4].…”

Section: Dexnition Of the Problemmentioning

confidence: 99%

A semi‐empirical method for the liquefaction analysis of offshore foundations

Taiebat

Carter

2000

Int. J. Numer. Anal. Meth. Geomech.

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SUMMARYThis paper presents a relatively simple method for three-dimensional liquefaction analysis of granular soil under o!shore foundations. In this method, the Mohr}Coulomb model, which de"nes the elasto}plastic stress}strain relationship under monotonic loading, is modi"ed to accommodate the plastic strains generated by cyclic loading. The e!ects of cyclic loading, evaluated from the results of laboratory tests on saturated samples of soil, are incorporated into the model. The method is implemented in an e$cient "nite element program for analyses of three-dimensional consolidating soil. The practicability of the model is demonstrated by analysis of a typical o!shore foundation, and the predictions of the numerical analysis are compared with the observed behaviour of the foundation.

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Cyclic Soil Data for Design of Gravity Structures

Cited by 117 publications

References 6 publications

An effective stress framework for estimating penetration resistance accounting for changes in soil strength from maintained load, remoulding and reconsolidation

An effective stress framework for estimating penetration resistance accounting for changes in soil strength from maintained load, remoulding and reconsolidation

Effects of cyclic shear stress and average shear stress on the cyclic loading failure of marine silty sand

A semi‐empirical method for the liquefaction analysis of offshore foundations

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