Vibratory pile driving in water-saturated sand: Back-analysis of model tests using a hydro-mechanically coupled CEL method

Staubach, Patrick; Macháček, Jan; Skowronek, J.; Wichtmann, Torsten

doi:10.1016/j.sandf.2020.11.005

Cited by 34 publications

(22 citation statements)

References 27 publications

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“…numgeo is a finite-element code specialized on geotechnical boundary value problems. numgeo has been applied for the simulation of vibratory pile driving in saturated sand reported in [45,65] and for the investigation of the influence of the installation on the behaviour of piles subjected to lateral cyclic loading using the HCA model for sand in [63].…”

Section: Numerical Model Of the Centrifuge Testsmentioning

confidence: 99%

A high-cycle accumulation model for clay and its application to monopile foundations

et al. 2022

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A high-cycle accumulation (HCA) model predicting the accumulation of permanent strain or excess pore water pressure in clay under a large number of load cycles is presented. Data from an extensive laboratory testing program on kaolin under undrained cyclic loading has been analysed for that purpose. The influence of strain amplitude, void ratio, stress ratio, overconsolidation ratio and loading frequency on the accumulation rates is considered in the constitutive equations of the HCA model. The proposed model is validated first by the simulation of element tests. Subsequently, its application to offshore wind turbine foundations under long-term lateral cyclic loading is presented by the back-analysis of a centrifuge test on a monopile in soft clay. The results are in good accordance with the measurements in terms of pile displacement and bending moment versus number of applied cycles. It is concluded that the proposed model is feasible to describe the long-term behaviour of clay subjected to high-cyclic loading.

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Section: Numerical Model Of the Centrifuge Testsmentioning

confidence: 99%

A high-cycle accumulation model for clay and its application to monopile foundations

et al. 2022

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“…2 numgeo (Machaček & Staubach, see Ref. [35][36][37][38][39][40][41][42]75 and http://www.numgeo.de) is a stand-alone finite element program developed by the first two authors for the solution of non-linear, coupled (dynamic) geotechnical BVPs. 3 The stress tensor of the interface 𝝈 interface is not to be confused with the contact stress vector 𝒕 and its components.…”

Section: A C K N O W L E D G M E N T Smentioning

confidence: 99%

“…22numgeo (Machaček & Staubach, see Ref. 35–42,75 and http://www.numgeo.de) is a stand‐alone finite element program developed by the first two authors for the solution of non‐linear, coupled (dynamic) geotechnical BVPs.…”

mentioning

confidence: 99%

Novel approach to apply existing constitutive soil models to the modelling of interfaces

Staubach

Macháček

Wichtmann

2022

Num Anal Meth Geomechanics

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A novel scheme to apply constitutive (continuum) soil models to the mechanical modelling of soil-structure interfaces is presented. Opposite to existing approaches, all normal stress components of the interface depend directly on the normal stress components of the adjacent continuum. This allows to satisfy boundary conditions not only for the continuum but also for the interface. Interface models based on Hypoplasticity with intergranular strain extension and on Sanisand (version of 2004) are formulated. They are implemented in the framework of a mortar contact discretisation technique in a finite element code, which is available for download. A numerical differentiation scheme is used to secure consistent derivatives of contact forces with respect to displacement. The performance of the proposed interface models is evaluated by comparison with data from (cyclic) simple interface shear tests and an existing (hypoplastic) interface model proposed by Stutz et al. (2016). Subsequently, a large-scale cyclic interface shear test with complex geometry is simulated using the different interface models. It is concluded that only the novel interface formulation allows to appropriately consider the boundary conditions of the large-scale interface shear test in the interface.

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“…However, with the built-in CEL method, only perfectly drained or perfectly undrained conditions can be considered. The extension of the CEL method implemented in Abaqus allowing for partially drained analysis of watersaturated soils utilised in the simulations presented in the following is based on the work reported in (Hamann et al, 2015;Hamann, 2015;Staubach et al, 2020b;Staubach et al, 2021b). A u-p element formulation (Zienkiewicz and Shiomi, 1984), discretising the displacement of the solid phase and the pore water pressure, is employed.…”

Section: Numerical Simulation Of the Installation Processmentioning

confidence: 99%

“…A thermally coupled analysis is performed, but the temperature is reinterpreted as excess pore water pressure. Note that the shortcoming of this approach regarding the incorporation of soil-structure interface friction, where it was not possible to distinguish between effective and total normal contact stresses as reported in (Staubach et al, 2020b;Staubach et al, 2021b), can be circumvented to some extent. For this purpose, the friction coefficient is defined as temperature-dependent, reducing with increasing excess pore water pressure.…”

Section: Numerical Simulation Of the Installation Processmentioning

confidence: 99%

Long-Term Response of Piles to Cyclic Lateral Loading Following Vibratory and Impact Driving in Water-Saturated Sand

Staubach

Macháček

Bienen

et al. 2022

J. Geotech. Geoenviron. Eng.

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The influence of the pile installation by vibratory or impact driving on the response to subsequent cyclic lateral loading, as faced in the offshore environment, is investigated numerically. Largedeformation analyses of the pile installation process using the Coupled Eulerian-Lagrangian method considering partially drained conditions are performed. Following the installation, one million lateral load cycles are simulated using the high-cycle accumulation (HCA) model. The lower the hydraulic conductivity of the soil during driving, the higher the accumulation of lateral deformation when the pile is subjected to high-cyclic loading. The assumption of ideally drained conditions during pile driving results in a lower accumulation, in particular for the vibratory driven pile. Compared to the influence of the drainage conditions during driving, the influence of the installation method is found to be of less importance. While the vibratory driven piles tend to give less resistance to monotonic lateral loading for most conditions, slightly lower permanent pile head rotations after one million lateral loading cycles are observed compared to the impact driven piles.

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Vibratory pile driving in water-saturated sand: Back-analysis of model tests using a hydro-mechanically coupled CEL method

Cited by 34 publications

References 27 publications

A high-cycle accumulation model for clay and its application to monopile foundations

A high-cycle accumulation model for clay and its application to monopile foundations

Novel approach to apply existing constitutive soil models to the modelling of interfaces

Long-Term Response of Piles to Cyclic Lateral Loading Following Vibratory and Impact Driving in Water-Saturated Sand

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