A heuristic model inversion for coupled thermo-hydro-mechanical modelling of triaxial experiments

Lin, J. J.; Sari, Mustafa; Alevizos, Sotiris; Veveakis, Manolis; Poulet, Thomas

doi:10.1016/j.compgeo.2019.103278

Cited by 6 publications

(6 citation statements)

References 27 publications

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“…The growing interest in the behavior of DS and diatomites has focused on determining their critical conditions and formulating constitutive models describing their response patterns [31][32][33]40]. In most cases, diatomite is a "soft rock" [11,12] or a "mudstone" [12,14]. In their composition, they show a considerable percentage of diatomaceous fossils simultaneously with other elements, predominantly clayey or volcanic.…”

Section: Emergent Issues Of Ds In Geotechnical Researchmentioning

confidence: 99%

“…Lin et al [14] propose a methodology that considers thermo-hydro-mechanical variables to facilitate theoretical modelers to refine their elastic-viscoplastic models. For this, volumetric and deflection data were calibrated from several sets of triaxial tests on samples of "diatomaceous mudstone" (1% sand, 66% silt, 33% clay) and "sandstone".…”

Section: Emergent Issues Of Ds In Geotechnical Researchmentioning

confidence: 99%

“…For the case of the DS, the drained triaxial test records were evaluated, with whose stress-strain results the model was calibrated. From the background used by the authors, a correct fit with the failure envelope defined by the extended Cam-clay model was identified [14].…”

Section: Emergent Issues Of Ds In Geotechnical Researchmentioning

confidence: 99%

“…The literature review has allowed us to identify recent lines of study regarding DS. In the first instance, the trend in the development of constitutive models that seek to explain the unconventional responses (high LL, high friction angle, unpredictable secondary compressibility) of this type of deposit is recognized; computational tools support this and include concepts such as "soft rocks", boundary surface, geomaterials and elasticviscoplastic models, among others [10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

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Diatomaceous Soils and Advances in Geotechnical Engineering—Part II

Zuluaga-Astudillo,

Slebi-Acevedo,

Ruge

et al. 2023

Buildings

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In the geotechnical area, advances in diatomaceous soil research are laconic and mainly oriented towards understanding the primary soil response (typical characterization methods) considering observation and experience (failures in construction processes or unexpected laboratory results) more than following a scientific method. Coincident results have been evidenced in the correspondence between the content of frustules, the effective friction angle and the water retention capacity. However, the variables and processes that control some mechanical behaviors have yet to be documented in the literature, such as the level of fracturing of the frustules and its relation with interlocked behavior, compressibility and shear strength. In addition to the bibliographic background, SEM microscopy records are presented. These facilitate the understanding of the described phenomena. The images highlight the level of deterioration, the environment, the morphology and the pores present in diatoms of different origins. The morphology (as a function of the species) of intact or fractured frustules (depending on the stress record) affects the mechanical responses and volumetric variations of the diatomaceous deposits. Furthermore, this review presents some emerging research lines in diatomaceous soils, such as the subjection of structures to geotechnical centrifuge conditions, some constitutive models and the criteria for developing water retention curves.

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Section: Emergent Issues Of Ds In Geotechnical Researchmentioning

confidence: 99%

Section: Emergent Issues Of Ds In Geotechnical Researchmentioning

confidence: 99%

Section: Emergent Issues Of Ds In Geotechnical Researchmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Diatomaceous Soils and Advances in Geotechnical Engineering—Part II

Zuluaga-Astudillo,

Slebi-Acevedo,

Ruge

et al. 2023

Buildings

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“…An important source of computational cost comes from the fact that non-trivial constitutive plastic law are usually implemented to reproduce the behaviour of the material. Indeed, characterising the plastic behaviour of a real material is no easy feat as there exist numerous constitutive models [29], some of which that require many parameters to be calibrated [26]. Additionally for geomaterials, that cost is then amplified by the size of the mesh, noting that high resolutions are needed to match the REV with accurate grain shapes.…”

Section: Introductionmentioning

confidence: 99%

Predicting the yield stress of a 3D printed porous material from its internal structure

Lesueur¹,

Poulet²,

Veveakis³

2023

Preprint

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The design of any engineering structure requires the knowledge, and therefore determination, of the yield, i.e. limit of elasticity, for the building material. Whilst destructive experimental testing is currently necessary to do so, our work is part of initiatives which aim at deriving the yield without such laboratory experiments. The seminal work of Gurson (1977) on a simplified pore structure, a single spherical pore, first provided a theoretical relationship between the yield stress and the porosity. Specifically, it showed that the presence of pore space is responsible for the existence of a compression cap in plasticity, in addition to lowering the yield stress. This contribution extends the approach to determine the macroscopic yield of a porous material by taking explicitly into account its internal structure. As the yielding of a porous material is controlled by the geometry of its internal structure, we postulate that it is nearly independent of the constitutive plastic behaviour of the material. Here, we show that the influence of that internal structure on the yield could be retrieved from a finite element computation with just an elasto-plastic ideal material equivalent of the skeleton’s. With some basic knowledge about the skeleton’s mechanical properties, this process allows the determination of the yield stress without requiring the experimental compression of the material. We showcase the predictive power of the method against experimental testing, initially for a unique spherical void in a 3D-printed cylinder sample following Gurson, before demonstrating its applicability on a complex 3D-printed rock microstructure, reconstructed from segmented micro-Computerised Tomography scans.

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