Title
Numerical modeling of the vegetation and atmosphere effect on the behaviour of civil infrastructure embankments: doctoral dissertation
Creator
Pujević, Veljko, 1985-
CONOR:
63247113
Copyright date
2021
Object Links
Select license
Autorstvo-Nekomercijalno-Bez prerade 3.0 Srbija (CC BY-NC-ND 3.0)
License description
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Language
Serbian
Cobiss-ID
Theses Type
Doktorska disertacija
description
Datum odbrane: 30.09.2021.
Other responsibilities
Academic Expertise
Tehničko-tehnološke nauke
University
Univerzitet u Beogradu
Faculty
Građevinski fakultet
Alternative title
Numeričko modeliranje uticaja vegetacije i atmosfere na ponašanje nasipa građevinske infrastrukture
Publisher
[V.B. Pujević]
Format
XVII, 187 str.
description
Civil Engineering - Geotechnical Engineering / Gradjevinarstvo -Gradjevinska geotehnika
Abstract (en)
The soil-vegetation-atmosphere interaction is a dynamic process, which governs the continuous
change of soil hydrological conditions. These changes directly affect the seasonal and long-term
performance of infrastructure cut and embankment slopes. It has been established that the combined
effect of vegetation and precipitation induces seasonal cycles of shrinkage and swelling, which give
rise to serviceability issues and consequential high maintenance costs.
Numerous researchers attempted to incorporate the effect of the soil-vegetation-atmosphere system
interaction in the analysis of boundary value problems. The goal was to improve the understanding
of the effects of this complex interaction on the hydro-mechanical response of infrastructure
embankments. However, the proposed approaches were unable to quantitatively reproduce the
observed hydraulic behaviour.
Within the framework of the present thesis, a different approach is proposed. It is based on the fully
coupled flow-deformation analysis, combined with unsaturated soil mechanics theory and
sophisticated climatic boundary conditions, implemented within the ICFEP numerical code. Two
types of unsaturated constitutive models were applied, elasto-plastic unsaturated Mohr-Coulomb type
model and advanced BBM model. The instrumented railway embankment located in the UK,
suffering from poor track ride quality related to the presence of vegetation on the slopes, is used for
validation purposes. The comparative analysis suggests that proposed models are plausible
representative of reality.
Subsequently, a comprehensive parametric analysis is conducted. The results indicate that
unsaturated hydraulic properties of clay fill represent the key factors governing the embankment
response to seasonal wetting-drying patterns.
Abstract (sr)
Interakcija između atmosfere, vegetacije i tla je dinamičan proces koji je direktno odgovoran za
kontinuiranu promenu stanja vode u tlu. Ove promene imaju značajan, često nepovoljan uticaj kako
na sezonsko, tako i na dugoročno ponašanje brojnih geotehničkih zemljanih konstrukcija, kao što su
nasipi i useci. Praksa je utvrdila da je delovanjem vegetacije i atmosfere posebno ugrožena
upotrebljivost infrastrukturnih nasipa izgrađenih od glinovitih materijala, što se ogleda u značajnom
porastu nepredviđenih troškova održavanja.
Brojni su pokušaji da se efekat predmetne interakcije implementira u analizi graničnih problema kako
bi se unapredilo razumevanja njenog uticaja na hidro-mehaničko ponašanje infrastrukturnih nasipa.
Medjutim, numeričke prognoze dosadašnjih proračunskih pristupa nisu bile konzistentne sa in-situ
merenjima.
U okviru ove disertacije predložen je drugačiji pristup koji se zasniva na spregnutoj filtraciono-
defromacionoj analizi uz primenu hidrauličkih i mehaničkih konstitutivnih modela za nezasićene
geomaterijale u kombinaciji sa sofisticiranim klimatskim graničnim uslovima. Razmatrana su dva
nezasićena konstitutivna modela (BBM i nezasićeni Mohr-Coulom) različitog stepena složenosti.
Numeričke analize sprovedene su u programu ICFEP. Visoka pozdanost predloženog pristupa
verifikovana je uporednom analizom sa rezultatima terenskog osmatranja eksperimentalne deonice
železničkog nasipa na jugu Engleske koji je podložan prekomernim cikličnim deformacijama
bubrenja i skupljanja prouzrokovanih delovanjem vegetacije.
U nastavku, sprovedena je detaljna parametarska analiza koja je kao ključne faktore koji kontrolišu
sezonske-ciklične varijacije pornih pritisaka i deformacija identifikovala nezasićene hidrauličke
karakteristike glinovite ispune.
Authors Key words
embankment, clay fill, ash, unsaturated soils, vegetation, precipitation, soil-
atmosphere interaction, serviceability, slope stability
Authors Key words
nasip, glinovita ispuna, pepeo, nezasićeni geomaterijali, vegetacija, presipitacija,
interakcija sistema tlo-atmosfera
Classification
624.135:624.131.22(043.3)
Type
Tekst
Abstract (en)
The soil-vegetation-atmosphere interaction is a dynamic process, which governs the continuous
change of soil hydrological conditions. These changes directly affect the seasonal and long-term
performance of infrastructure cut and embankment slopes. It has been established that the combined
effect of vegetation and precipitation induces seasonal cycles of shrinkage and swelling, which give
rise to serviceability issues and consequential high maintenance costs.
Numerous researchers attempted to incorporate the effect of the soil-vegetation-atmosphere system
interaction in the analysis of boundary value problems. The goal was to improve the understanding
of the effects of this complex interaction on the hydro-mechanical response of infrastructure
embankments. However, the proposed approaches were unable to quantitatively reproduce the
observed hydraulic behaviour.
Within the framework of the present thesis, a different approach is proposed. It is based on the fully
coupled flow-deformation analysis, combined with unsaturated soil mechanics theory and
sophisticated climatic boundary conditions, implemented within the ICFEP numerical code. Two
types of unsaturated constitutive models were applied, elasto-plastic unsaturated Mohr-Coulomb type
model and advanced BBM model. The instrumented railway embankment located in the UK,
suffering from poor track ride quality related to the presence of vegetation on the slopes, is used for
validation purposes. The comparative analysis suggests that proposed models are plausible
representative of reality.
Subsequently, a comprehensive parametric analysis is conducted. The results indicate that
unsaturated hydraulic properties of clay fill represent the key factors governing the embankment
response to seasonal wetting-drying patterns.
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