Guidelines for Calibration and Use of the Severn-Trent Sand Model in Modeling Cantilevered Wall-Supported Excavations

Rotisciani, G. M.; Miliziano, S.

doi:10.1061/(asce)gm.1943-5622.0000373

Cited by 12 publications

(3 citation statements)

References 14 publications

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“…(3) predominantly governs the initial (drained) stress-strain response and is influenced by the elastic constants ν and G 0 . Rotisciani and Miliziano (2014) concluded that ν does not significantly affect the response in a drained TXC test. Based on the general guidelines provided by Benz (2007), any value of ν between 0.1 and 0.3 works reasonably well for sands, under drained conditions.…”

Section: Deciding On the Initial Range For Elastic Parameters (G 0 ν)mentioning

confidence: 98%

Use of a bounding surface model in predicting element tests and capacity in boundary value problems

et al. 2021

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The paper examines the merit of a two surface plasticity model through an optimised calibration procedure and assesses the model performance in capturing the response at both element and system level. The governing equations are based essentially on the parent two surface plasticity model developed by Dafalias and Manzari (2004) with some simple yet practical changes to enable realistic predictions for monotonic loading along different load paths. This is achieved by scaling the influence of state parameter based on a normalised measure of anisotropy, thus leading to suitable change in dilatancy and plastic modulus for different loading directions. The paper presents a simple optimisation technique for calibrating the model parameters, providing an objective approach to reduce the uncertainties in parameter determination that leads to good agreement with responses measured in drained and undrained triaxial tests. The model has also been implemented for the boundary value problem of a buried circular plate anchor and a surface circular footing. Comparisons of the simulated responses with those measured in centrifuge tests demonstrate the potential of the model, whilst also pointing to the challenges in capturing the global response at all strain levels, even for rather simple boundary value problems.

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Section: Deciding On the Initial Range For Elastic Parameters (G 0 ν)mentioning

confidence: 98%

Use of a bounding surface model in predicting element tests and capacity in boundary value problems

et al. 2021

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“…For example, it can reproduce well the compression triaxial tests and extension triaxial tests of Toyoura sand. The model has also been successfully used to model the cantilevered wall-supported excavations [40,41].…”

Section: Severn-trent Sand Modelmentioning

confidence: 99%

Methods for Solving Finite Element Mesh-Dependency Problems in Geotechnical Engineering—A Review

et al. 2022

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The instabilities of soil specimens in laboratory or soil made geotechnical structures in field are always numerically simulated by the classical continuum mechanics-based constitutive models with finite element method. However, finite element mesh dependency problems are inevitably encountered when the strain localized failure occurs especially in the post-bifurcation regime. In this paper, an attempt is made to summarize several main numerical regularization techniques used in alleviating the mesh dependency problems, i.e., viscosity theory, nonlocal theory, high-order gradient and micropolar theory. Their fundamentals as well as the advantages and limitations are presented, based on which the combinations of two or more regularization techniques are also suggested. For all the regularization techniques, at least one implicit or explicit parameter with length scale is necessary to preserve the ellipticity of the partial differential governing equations. It is worth noting that, however, the physical meanings and their relations between the length parameters in different regularization techniques are still an open question, and need to be further studied. Therefore, the micropolar theory or its combinations with other numerical methods are promising in the future.

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“…The model has been proven to be effective in predicting sand behaviour for a wide range of boundary value problems (e.g. [1,37,51]). The constitutive parameters are carefully calibrated on the basis of element tests of Perth sand samples.…”

Section: Introductionmentioning

confidence: 99%

Numerical modelling of the effects of foundation scour on the response of a bridge pier

et al. 2022

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Foundation scour can have a detrimental effect on the performance of bridge piers, inducing a significant reduction of the lateral capacity of the footing and accumulation of permanent settlement and rotation. Although the hydraulic processes responsible for foundation scour are nowadays well known, predicting their mechanical consequences is still challenging. Indeed, its impact on the failure mechanisms developing around the foundation has not been fully investigated. In this paper, numerical simulations are performed to study the vertical and lateral response of a scoured bridge pier founded on a cylindrical caisson foundation embedded in a layer of dense sand. The sand stress–strain behaviour is reproduced by employing the Severn-Trent model. The constitutive model is firstly calibrated on a set of soil element tests, including drained and undrained monotonic triaxial tests and resonant column tests. The calibration procedure is implemented considering the stress and strain nonuniformities within the samples, by simulating the laboratory tests as boundary value problems. The numerical model is then validated against the results of centrifuge tests. The results of the simulations are in good agreement with the experimental results in terms of foundation capacity and settlement accumulation. Moreover, the model can predict the effects of local and general scour. The numerical analyses also highlight the impact of scouring on the failure mechanisms, revealing that the soil resistance depends on the hydraulic scenario.

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Guidelines for Calibration and Use of the Severn-Trent Sand Model in Modeling Cantilevered Wall-Supported Excavations

Cited by 12 publications

References 14 publications

Use of a bounding surface model in predicting element tests and capacity in boundary value problems

Use of a bounding surface model in predicting element tests and capacity in boundary value problems

Methods for Solving Finite Element Mesh-Dependency Problems in Geotechnical Engineering—A Review

Numerical modelling of the effects of foundation scour on the response of a bridge pier

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