Infinite elements in problems of geomechanics

Donida, G.; Bruschi, Roberto; Bernetti, R.

doi:10.1016/0045-7949(88)90172-1

Cited by 6 publications

(1 citation statement)

References 4 publications

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“…If adequate boundaries are not established to manage excessive motion, waves may be reflected back into the structure rather than propagating out of the model. Consequently, a differential equation based solution may result in inaccurate field measurements (Donida et al, 1988).…”

Section: Introductionmentioning

confidence: 99%

Implementation and verification of direct infinite elements in axisymmetric problems

Bakhtaoui,

Chelghoum

2024

J. Geomec. Geoeng.

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In the field of dynamic soil-structure interaction, the simulation of geotechnical massifs under non-vanishing time-averaged loads is often challenging, depending on factors such as load variations, the 3D model representation and the chosen model boundaries. This study aims to evaluate the effectiveness of the method developed recently by the authors under non-vanishing time-averaged loads. The evaluation involves comparing the results of a homogeneous axisymmetric model at two control points and the simulation of an axisymmetric bilayer. The aim is to demonstrate the robustness of the method in contrast to widely used dissipative devices in scenarios involving sudden loading. Using an implicit integration scheme in the time domain, the method is shown to be effective and correlations with reliable solutions and comparisons with common dissipative devices for sudden-load models are presented. This analysis leads to the conclusion that the proposed procedure adeptly addresses the challenges associated with the simulation of geotechnical masses under non-vanishing time-averaged loads.

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Section: Introductionmentioning

confidence: 99%

Implementation and verification of direct infinite elements in axisymmetric problems

Bakhtaoui,

Chelghoum

2024

J. Geomec. Geoeng.

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Finite element modelling of rock‐socketed piles

Leong

Randolph

1994

Num Anal Meth Geomechanics

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SUMMARYRock socketed piles have a number of features which differentiate them from other types of piles. The generally stubby geometry leads to more even distribution of capacity between shaft and base. However, the low ratio of pile modulus to rock modulus leads to high compressibility and this, coupled with a tendency for the load transfer response along the shaft to exhibit strain-softening, gives rise to an overall response where the shaft capacity may be fully mobilized, and potentially degraded, before significant mobilization of base load.The paper presents results of finite element analyses of the response of rock-socketed piles, with particular attention to the shaft response with and without intimate base contact. The shaft interface uses a model, developed from principles of tribology, that includes dilation (and strain-hardening) prior to peak shaft friction, followed by strain-softening at larger displacements. The results of the study are shown to be consistent with field measurements, and to capture effects of the absolute pile diameter on the peak shaft friction. It is also shown that intimate base contact mitigates significantly the degree of strain-softening of the shaft response.

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