Benchmarking selection of parameter values for the Barcelona basic model

D'Onza, F.; Wheeler, Simon J.; Gallipoli, Domenico; Bucio, M Barrera; Hofmann, Matthias; Lloret-Cabot, Martí; Morancho, Antonio Lloret; Mancuso, Claudio; Pereira, Jean‐Michel; Romero, E.; Sánchez, Marcelo; Sołowski, Wojciech Tomasz; Tarantino, Alessandro; Toll, D. G.; Vassallo, Roberto

doi:10.1016/j.enggeo.2015.06.022

Cited by 16 publications

(18 citation statements)

References 11 publications

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“…7 teams of experienced constitutive modelers provided with the same experimental results on an unsaturated soil to calibrate the parameter value for the BBM. Theoretically, the calibrated parameters were expected to be the same or very close, yet the selected values proved to be surprisingly scattered [2].…”

Section: Introductionmentioning

confidence: 98%

“…While some advances have been introduced to the former topic to characterize unsaturated soil behaviour in a faster and more accurate way [13][14][15], little progress was made in the latter one. Despite the fact that a great number of efforts have been recently dedicated to calibrating model parameters for the BBM [2,[12][13][14][15][16][17], concerns still exist on the correctness and robustness of such calibration procedures. The above statements were evidenced by a recent benchmark exercise on selection of parameter values for the BBM organized within a "Marie Curie" Research Training Network on "Mechanics of Unsaturated Soils for Engineering" (MUSE).…”

Section: Introductionmentioning

confidence: 99%

“…Concerns still exist on the correctness and robustness of such parameter value selection procedures. The above statements were evidenced by a recent benchmark exercise on selection of parameter values for the BBM organized within a "Marie Curie" Research Training Network on "Mechanics of Unsaturated Soils for Engineering" (MUSE) [2]. Experienced constitutive modelers in unsaturated soils from 7 prestigious teams were provided with the same experimental results on an unsaturated soil to calibrate the parameter values in the BBM.…”

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confidence: 99%

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Calibration of BBM Parameters using the Modified State Surface Approach

2023

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The Barcelona Basic Model (BBM) developed by Alonso et al. [1] is the first and the mostwidely used elasto-plastic model for unsaturated soils. The BBM successfully explained many key features of unsaturated soils and received extensive acceptance. However, there is lack of a well-establishedmethod for selecting parameter values for the BBM from laboratory tests, although a variety of methods have been recently developed for calibrating model parameters for the BBM. Concerns still exist on the correctness and robustness of such parameter value selection procedures. The above statements were evidenced by a recent benchmark exercise on selection of parameter values for the BBM organized within a "Marie Curie" Research Training Network on "Mechanics of Unsaturated Soils for Engineering"(MUSE)[2]. Experienced constitutive modelers in unsaturated soils from 7 prestigious teams were provided with the same experimental results on an unsaturated soil to calibrate the parameter values in the BBM. Theoretically, the calibrated parameters from different teams are expected to be the same or at leastvery close. However, the selected parameter values by the 7 teams are surprisingly widely different. This paper first discussed the limitations in the existing methods to calibrate the parameter values in the BBM. A novel approach was then proposed to calibrate the parameter values for the BBM. The approach takes advantage of the close-form solution of the BBM, which is derived based upon a newly proposed Modified State Surface Approach to study the unsaturated soils [3-6]. The same experimental data, used in the MUSE benchmark exercise, were reanalysed using the proposed approach to calibrate parameters for the BBM. The results were compared with those in the MUSE benchmark exercise from which thesimplicity, effectiveness, and robustness of the proposed method were evaluated.

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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confidence: 99%

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Calibration of BBM Parameters using the Modified State Surface Approach

2023

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“…Validation exercises and benchmarks aimed at exploring the capability of models and modelers to simulate unsaturated soil behavior have been reported (e.g. Rampino et al 2000;Geiser et al 2000;Barrera et al 2002;Zhou and Sheng 2009;D'Onza et al 2011;D'Onza et al 2015).…”

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confidence: 99%

Mechanical behavior of an unsaturated clayey silt: an experimental and constitutive modelling study

et al. 2019

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This paper reports an experimental study and subsequent constitutive modelling focused on the stress-strain and volumetric responses during deviatoric stress application of a partially saturated clayey silt. The material was statically and isotropically compacted at constant water content towards a pre-defined pre-consolidation stress. A series of strain-controlled triaxial compression tests on a state of the art device and isotropic experiments are presented and discussed. The triaxial tests started at the same stress state (i.e., identical matric suction and mean net stress) and were conducted at the same constant suction. Several stress paths under isotropic conditions (i.e., drying–wetting, loading–unloading, and wetting–drying) were followed to induce different overconsolidated states before shearing the specimens. The test results are initially interpreted using the elastoplastic Barcelona Basic Model (BBM). Independent tests were selected to determine the model parameters associated with the volumetric behavior of the soil. The BBM was not able to capture the dilatant behavior observed during shearing. An enhancement of the BBM is proposed in this work, which includes both, a more general hardening law and sub-loading concepts. The main capabilities and limitations of the original BBM and the enhanced model are discussed and compared. The modified BBM was able to handle the dilatancy observed in the experiments and provided a more realistic description of the experimental stress-strain response.

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“…Proper distinction between saturated and unsaturated states is not only relevant for a more comprehensive representation of the occurrence and magnitude of plastic volumetric compression (e.g. [3,5,6,10,20,28,33,44,65,66,76]) but also for a more reliable prediction of shear strength (e.g. [11,12,22,48,73,79]).…”

Section: Introductionmentioning

confidence: 99%

From saturated to unsaturated conditions and vice versa

et al. 2017

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Representing transitions between saturated and unsaturated conditions, during drying, wetting and loading paths, is a necessary step for a consistent unification between saturated and unsaturated soil mechanics. Transitions from saturated to unsaturated conditions during drying will occur at a nonzero air-entry value of suction, whereas transitions from unsaturated to saturated conditions during wetting or loading will occur at a lower nonzero air-exclusion value of suction. Air-entry and airexclusion values of suction for a given soil will differ (representing hysteresis in the retention behaviour) and both are affected by changes in the dry density of the soil or by the occurrence of plastic volumetric strains. The paper demonstrates, through model simulations and comparison with experimental data from the literature (covering drying, wetting and loading tests), that the Glasgow Coupled Model (GCM), a coupled elasto-plastic constitutive model covering both mechanical and retention behaviour, represents transitions between unsaturated and saturated behaviour in a consistent fashion. Key aspects of the GCM are the use of Bishop's stress tensor for mechanical behaviour, the additional influence of degree of saturation on mechanical yielding, inclusion of hysteresis in the retention behaviour, and the role of plastic volumetric strains (and not total volumetric strains) in the description of the water retention response. The success of the GCM in representing consistently transitions between saturated and unsaturated conditions, together with subsequent mechanical and retention responses, demonstrates the potential of this coupled constitutive model for numerical modelling of boundary value problems involving saturated and unsaturated conditions.

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Benchmarking selection of parameter values for the Barcelona basic model

Cited by 16 publications

References 11 publications

Calibration of BBM Parameters using the Modified State Surface Approach

Calibration of BBM Parameters using the Modified State Surface Approach

Mechanical behavior of an unsaturated clayey silt: an experimental and constitutive modelling study

From saturated to unsaturated conditions and vice versa

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