• A hybrid numerical model for multiphase fluid flow in a deformable porous medium 

      Ghoreishian Amiri, Seyed Ali; Sadrnejad, S. A.; Ghasemzadeh, H. (Journal article; Peer reviewed, 2017)
      In this paper, a fully coupled finite volume-finite element model for a deforming porous medium interacting with the flow of two immiscible pore fluids is presented. The basic equations describing the system are derived ...
    • An elastic-viscoplastic model for saturated frozen soils 

      Ghoreishian Amiri, Seyed Ali; Grimstad, Gustav; Kadivar, Mehdi (Journal article; Peer reviewed, 2017)
      From the material science point of view, saturated frozen soil is a natural particulate composite, composed of solid grains, ice and unfrozen water. The mechanical behaviour of such a material is strongly affected by the ...
    • Bearing Capacity Analysis Over Mudmat Foundations Under Multidimensional Loading 

      HERAVI, GHAZALEH (Master thesis, 2018)
      The ultimate bearing capacity is at its maximum when the foundation is under pure vertical loading. In the field, pure vertical loading is the least likely load combination to happen but, it is mostly combined loading ...
    • Comparison of Geoacoustic Models for Unfrozen Water Content Estimation 

      Lyu, Chuangxin; Ghoreishian Amiri, Seyed Ali; Grimstad, Gustav; Høyland, Knut Vilhelm; Ingeman-Nielsen, Thomas (Peer reviewed; Journal article, 2020)
      This paper reviews eight geoacoustic models applied to frozen soils: crystal growth models (grain cementing, grain coating, matrix supporting, and pore filling), the weighted equation (WE) model, Zimmerman and King's model ...
    • Constitutive Model for Long-Term Behavior of Saturated Frozen Soil 

      Ghoreishian Amiri, Seyed Ali; Grimstad, Gustav (Chapter, 2017)
      In this paper a two stress-state variables model with solid phase stress and cryogenic suction is introduced for simulating the long-term behavior of frozen soils. The solid phase stress is introduced as the combined stress ...
    • Creep of geomaterials – some finding from the EU project CREEP 

      Grimstad, Gustav; Karstunen, Minna; Jostad, Hans Petter; Sivasithamparam, Nallathamby; Mehli, Magne; Zwanenburg, Cor; Evert, den Haan; Ghoreishian Amiri, Seyed Ali; Boumezerane, Djamalddine; Kadivar, Mehdi; Haji Ashrafi, Mohammad Ali; Rønningen, Jon A. (Journal article; Peer reviewed, 2017)
      This paper gives a summary of some of the main findings of the EU founded project “Creep of geomaterials”, CREEP. CREEP was an Industry-Academia Partnerships and Pathways (IAPP) project funded from the 7th Framework Programme ...
    • Elastoplastic model for hydro-mechanical behavior of unsaturated soils 

      Ghasemzadeh, H.; Sojoudi, M.H.; Ghoreishian Amiri, Seyed Ali; Karami, M.H. (Journal article; Peer reviewed, 2017)
      A coupled elastoplastic constitutive model is presented for describing the hydraulic and mechanical behaviors of unsaturated soils. The model is capable of considering the influence of the irreversible changes in water ...
    • Enhanced permafrost creep model– user manual and documentation 

      Ghoreishian Amiri, Seyed Ali; Kadivar, Mehdi (Research report, 2016)
      The mechanical behavior of frozen soils is one of the challenging topics in the field of geotechnical engineering. The behavior of frozen soils is strongly affected by the amount of ice, while on the other hand, the amount ...
    • Finite Element Analysis of Coupled Thermo-Hydro-Mechanical Processes in Fully Saturated, Partially Frozen Soils 

      Rostami, Hooman (Master thesis, 2017)
      Interest in permafrost, or seasonally frozen ground, has been increasing over the last decades. Nearly 24% of the northern hemisphere, is covered with permafrost. Humankind's need for energy and raw materials has pushed ...
    • Formation and growth of multiple, distinct ice lenses in frost heave 

      Gao, Hao; Ghoreishian Amiri, Seyed Ali; Kjelstrup, Signe; Grimstad, Gustav; Loranger, Benoit; Scibilia, Elena (Peer reviewed; Journal article, 2022)
      This paper presents a fully coupled thermo-hydro-mechanical (THM) modelwhich simulates frost heave in fully saturated soils. The model is able tosimulate the formation and growth of multiple distinct ice lenses. The ...
    • Frost protection in roads using insulation materials 

      Grimstad, Gustav; Ghoreishian Amiri, Seyed Ali; Watn, Arnstein; Hoff, Inge (Chapter, 2018)
    • A hybrid finite element model for non-isothermal two-phase flow in deformable porous media 

      Ghoreishian Amiri, Seyed Ali; Taheri, Ehsan; Arash, Alimardani Lavasan (Peer reviewed; Journal article, 2021)
      This paper presents a numerical method to model the coupled thermo-hydro-mechanical (THM) processes in porous media saturated with two immiscible fluids. The basic equations of the system have been derived based on the ...
    • Investigation of Development of the Earth Pressure Coefficient at Rest in Clay During Creep in the Framework of Hyper-Viscoplasticity 

      Grimstad, Gustav; Long, Michael; Dadrasajirlou, Davood; Ghoreishian Amiri, Seyed Ali (Peer reviewed; Journal article, 2021)
      The in situ earth pressure coefficient at rest (K0) for clay has been widely discussed in the literature. In engineering practice, the empirical relationships between K0, the overconsolidation ratio (OCR), and the normally ...
    • Joint Acoustic and Electrical Measurements for Unfrozen Water Saturation Estimate—A Review 

      Lyu, Chuangxin; Ghoreishian Amiri, Seyed Ali; Gao, Hao; Ingeman-Nielsen, Thomas; Grimstad, Gustav (Chapter, 2019)
      The previous laboratory study of joint electrical resistivity and acoustic velocity measurements is reviewed for both consolidated and unconsolidated permafrost in this paper. The relation of logarithm of resistivity log(R) ...
    • Modelling creep in clay using the framework of hyper-viscoplasticity 

      Grimstad, Gustav; Dadrasajirlou, Davood; Ghoreishian Amiri, Seyed Ali (Peer reviewed; Journal article, 2020)
      This paper addresses the derivation of creep models using the framework of hyper-viscoplasticity. It demonstrates that the formulations widely used already can easily be obtained using the hyper-viscoplastic formalism. ...
    • Modelling the seasonal variations of soil temperatures in the Arctic coasts 

      Islam, Mohammad Akhsanul; Lubbad, Raed; Ghoreishian Amiri, Seyed Ali; Isaev, Vladislav; Shevchuk, Yaroslav; Uvarova, Alexandra Vladimirovna; Afzal, Mohammad Saud; Kumar, Avinash (Peer reviewed; Journal article, 2021)
      The soil temperature within the Arctic coasts within the continuous permafrost is not widely measured; the temporal and spatial resolutions of the measured temperature observations are relatively high. In this study, we ...
    • Numerical modeling to estimate the impact of built infrastructure on permafrost degradation - Case study from Ilulissat, Greenland 

      Näke, Luisa (Master thesis, 2023)
      Infrastruktur i permafrostlandskap påvirker bakkens termiske regime og kan øke permafrostens nedbrytning. Stabiliteten og brukbarheten til infrastrukturen avhenger likeledes av de termiske forholdene i undergrunnen. ...
    • Numerical modelling of distinct ice lenses in frost heave 

      Ghoreishian Amiri, Seyed Ali; Grimstad, Gustav; Gao, Hao; Kjelstrup, Signe (Peer reviewed; Journal article, 2021)
      Frost heave happens when three conditions coincide: the temperature is below the normal freezing point of bulk water, the sub-cooled water is connected to a water reservoir, and the mechanical conditions of the soil allows ...
    • On the isotache viscous modelling of clay behaviour using the hyperplasticity approach 

      Dadrasajirlou, Davood; Grimstad, Gustav; Ghoreishian Amiri, Seyed Ali (Journal article; Peer reviewed, 2022)
      The thermodynamically based hyperplasticity framework is employed to develop a hyper-viscoplastic constitutive model describing clay's creep and rate-dependent behaviour. The proposed model complies with the concept of the ...
    • Pile Loading Test in Permafrost - Back Analysis of Settlements Using an Elasto-Viscoplastic Model 

      Farnes Hennum, Tilla (Master thesis, 2023)
      Løsmasser i permafrost vil ha en høyere bæreevne og en lavere setningsrate en tilsvarende ikke-frosne løsmasser. Tradisjonelt har derfor løsmasser i permafrost vært et stabilt og pålitelig materiale for fundamentering. ...