Influence of relative acceleration in saturated sand: Analytical approach and simulation of vibratory pile driving tests

Staubach, Patrick; Macháček, Jan

doi:10.1016/j.compgeo.2019.03.027

Cited by 27 publications

(17 citation statements)

References 19 publications

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“…u-p elements discretize the displacement of the solid phase u and the pore water pressure p w . As has been shown in [62], u-U elements (discretizing the displacement of solid phase u and the displacement of water u w ) could be advantageous in case of low hydraulic conductivities and small time increments since the matrix conditioning of the resulting left-hand side is superior to the one of u-p elements. The well-known oscillations in pore water pressure occurring when using u-p elements are absent using u-U elements.…”

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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“…The performance of the calibration software is investigated by calibrating the parameters of the hypoplastic material model for two different sands. The first sand is the socalled Karlsruhe Sand (KSa): a medium coarse sand which has already been the basis for numerous model tests [54] and simulations [8,33,46]. The laboratory tests of this sand comprise oedometric compression tests and drained monotonic triaxial tests and were carried out at the Karlsruhe Institute of Technology.…”

Section: Experimental Data and Reference Parameter Setsmentioning

confidence: 99%

On the automatic parameter calibration of a hypoplastic soil model

et al. 2022

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This paper presents an approach for the automatic parameter calibration (AC) of a hypoplastic constitutive soil model. The calibration software developed in this work simplifies the parameter calibration, reduces the subjective “human” factor on the calibration result and lowers the entry hurdle for the use of the hypoplastic constitutive model. The performance of the software was demonstrated by comparing automatically calibrated parameter sets for two sands and their related simulations of the underlying experimental data with simulations using two reference parameter sets. The first reference parameter set was calibrated the classical way, "by hand", and the second was calibrated using the AC tool ExCalibre. Two different optimization methods were used, namely the Differential Evolution (DE) and the Particle Swarm Optimization (PSO). The simulations performed with the parameters obtained from the AC agree well with the experimental data and show improvements over the reference parameter sets. With respect to the optimization method, the performance of the DE proved superior to that of the PSO. Various measures of comparison were examined to quantify the discrepancy between experiment and simulation. By repeating 500 calibration runs, the dispersion of parameters was determined and correlations between different parameters of the hypoplastic model were found.

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“…Both criteria are simultaneously met for the analysis of vibratory pile driving in sandy soils. Therefore, preliminary investigations of the simulation of vibratory pile driving using the u-p-U and u-U element formulation, both considering the relative acceleration, reported in (Staubach and Machaček, 2019), were conducted. The relative acceleration was found to be of little importance, justifying the application of the u-p element formulation for the analysis of vibratory pile driving in soils with high values of hydraulic conductivity (up to k w ≈ 10 −3 m/s with a frequency of f ≈ 50 Hz).…”

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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Influence of relative acceleration in saturated sand: Analytical approach and simulation of vibratory pile driving tests

Cited by 27 publications

References 19 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

On the automatic parameter calibration of a hypoplastic soil model

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

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