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Thermo-mechanical simulation of frost heave in saturated soils.
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.ORCID iD: 0000-0002-4395-2541
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.ORCID iD: 0000-0001-7333-1140
(English)Manuscript (preprint) (Other academic)
Abstract [en]

Roads are subjected to various deteriorating mechanisms during their lifespan. The effects of the environment and climate on pavement deterioration are particularly severe in winter when humidity and subfreezing temperatures prevail. Of damages ascribed to winter conditions, frost heave occurs when the porewater in the soil is subjected to freezing temperatures. The study of frost heave requires conducting a multiphysics analysis including the thermal field, the mechanical field, and the hydraulic field. In the current study, a coupled thermo-mechanical approach is used to simulate frost heave in saturated soils. To couple the thermal and mechanical field analyses, a function predicting porosity evolution is implemented. This function implicitly takes into account the effect of the hydraulic field by ascertaining the consequence of water seepage inside the soil. To show the capabilities of the method, different case study scenarios with uniform and non-uniform boundary conditions are considered. The results of the simulations indicate that the thermo-mechanical model captures various processes involved in the frost heave phenomenon such as water fusion, porosity variation, cryogenic suction force generation, soil expansion, etc. The characteristics and consequences of each process are determined and discussed separately. Furthermore, it is shown that non-uniform thermal boundaries result in uneven ground surface deformations. 

Keywords [en]
frost heave; multiphysics analysis; thermo-mechanical approach; saturated ‎soils;‎
National Category
Civil Engineering
Research subject
Civil and Architectural Engineering
Identifiers
URN: urn:nbn:se:kth:diva-321677OAI: oai:DiVA.org:kth-321677DiVA, id: diva2:1712289
Funder
Swedish Transport Administration, TRV 2020/19896‎
Note

QC 20221129

Available from: 2022-11-21 Created: 2022-11-21 Last updated: 2022-11-29Bibliographically approved
In thesis
1. Modeling frost heave damages throughout the asphalt layer
Open this publication in new window or tab >>Modeling frost heave damages throughout the asphalt layer
2022 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

There are various distresses arising from traffic loads and the surrounding environment to whichan asphalt pavement is subjected during its life span. The environment-associated damages aremore severe during winter when abundant moisture and freezing temperature are presentsimultaneously. Damage caused by frost heave is one of the important winter-related damagesresulting in severe cracks and bumpy road surfaces. Since the frost heave-induced cracks areusually wide, they can make the pavement more prone to other types of damage by leaving theopen space for water and moisture penetration. Simulating the response of the pavement whenit is subjected to frost heave is the aim of this licentiate thesis. Attaining this objective requirescoupling a frost heave model with a damage model representing the mechanistic behavior ofthe asphalt material. With regard to the brittle behavior of the asphalt at cold temperatures, aviscoelastic damage model for asphalt material is coupled with a thermomechanical frost heavemodel. The thermomechanical approach couples the physical processes involved in frost actioninside the soil. To elucidate more, in this method the thermal and mechanical fields are coupledby the porosity evolution function which implicitly takes into account the effect of the hydraulicfield. On the other hand, the continuum viscoelastic damage model for asphalt material isdeveloped within the infinitesimal strain context by applying the thermodynamical restrictionsof irreversible processes. The suggested framework was employed in different finite elementmodels to simulate damages caused by frost heave in asphalt pavements. The results indicatethat it predicts the damage distribution and evolution in the asphalt. Furthermore, it was shownthat the uneven frost heave and physical processes taking place in the soil during frost actionsuch as cryogenic suction force creation, porosity evolution, ice formation, etc., can also besimulated.

Abstract [sv]

Det finns olika typer av påfrestningar som uppstår från trafikbelastningar och den omgivandemiljön som en asfaltbeläggning utsätts för under sin livslängd. De miljörelaterade skadorna ärallvarligare under vintern när fukt och kalla temperaturer är närvarande samtidigt. Skadororsakade av tjällyft är en av de allvarliga vinterrelaterade skadorna som resulterar i sprickor ochskadade vägsytor. Eftersom de tjällyftsinducerade sprickorna vanligtvis är breda kan de görabeläggningen mer utsatt för andra typer av skador genom vatten- och fuktinträngning. Syftetmed denna licentiatavhandling är att simulera beläggningens reaktion när den utsätts för tjällyft.För att uppnå detta mål krävs att en tjällyftsmodell kopplas till en skademodell somrepresenterar asfaltmaterialets mekanistiska beteende. När det gäller asfaltens spröda beteendevid kalla temperaturer, är en viskoelastisk skademodell för asfaltmaterial kopplad till entermomekanisk tjällyftsmodell. Det termomekaniska tillvägagångssättet kopplar de fysiskaprocesserna som är involverade i frostverkan inuti jorden. För att klarlägga detta mer, är determiska och mekaniska fälten kopplade med porositetsutvecklingsfunktionen som implicit tarhänsyn till effekten av det hydrauliska fältet. Å andra sidan är den kontinuumviskoelastiskaskademodellen för asfaltmaterial utvecklad inom det oändliga töjningssammanhanget genomatt tillämpa de termodynamiska begränsningarna av irreversibla processer. Det föreslagnaramverket användes i olika finita elementmodeller för att simulera skador orsakade av tjällyft iasfaltbeläggningar. Resultaten indikerar att den förutsäger skadefördelningen och utvecklingeni asfalten. Dessutom har det visat sig att det ojämna tjällyft och fysiska processer som äger rumi marken under frostpåverkan, såsom skapande av kryogen sugkraft, porositetsutveckling,isbildning, etc., också kan simuleras.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2022. p. 31
Series
TRITA-ABE-DLT ; 2243
Keywords
Asphalt pavement, Frost heave, Viscoelastic damage model, Thermomechanical approach., Asfaltbeläggning, tjällyft, viskoelastisk skademodell, termomekanisk ansats.
National Category
Civil Engineering
Research subject
Civil and Architectural Engineering, Structural Engineering and Bridges
Identifiers
urn:nbn:se:kth:diva-321679 (URN)978-91-8040-440-2 (ISBN)
Presentation
2022-12-16, E2, Osquars backe 2, KTH campus, videolänk saknas, Stockholm, 09:00 (English)
Opponent
Supervisors
Funder
Swedish Transport Administration, TRV 2020/19896‎
Note

QC 20221124

Available from: 2022-11-24 Created: 2022-11-21 Last updated: 2022-11-24Bibliographically approved

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Vosoughian, SaeedBalieu, Romain

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