Seyed Ali Ghoreishian Amiri

Norwegian University of Science and Technology | NTNU · Department of Civil and Environmental Engineering

This paper presents an elastoplastic constitutive model for the coupling of hydraulic and stress–strain behavior of unsaturated soils under isotropic loading conditions. The proposed model is capable of considering the influence of irrecoverable changes in water volume fraction on stress–strain behavior and plastic strain on hydraulic behavior. Bou...

The mechanical behavior of frozen soils is strongly affected by the amount of ice. The amount of ice depends on the temperature and the applied mechanical stresses. The influence of ice content and temperature on the mechanical behavior and the coupling effects on the reverse direction can be mentioned as the main difference between frozen and unfr...

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 based on the averaging theory. Applying the standard Galerkin finite element method to solve this system of partial differential e...

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 averaging theory, considering skeleton deformation, two-phase fluid flow, and heat transport. As applying the standard Galerkin fin...

This paper presents a fully coupled thermo-hydro-mechanical (THM) model which simulates frost heave in fully saturated soils. The model is able to simulate the formation and growth of multiple distinct ice lenses. The basic equations of the system were derived using the continuum theory of mixtures, nonequilibrium thermodynamics, and fracture mecha...

The approach of thermodynamics with internal variables, known as hyperplasticity, is used to develop a set of hyper-viscoplastic clay models that comply with the critical state soil mechanics and isotache viscosity. Different friction criteria of Drucker-Prager, Mohr-Coulomb, and Matsuoka-Nakai have been considered, and their conjugate features in...

In this paper, we describe a soil-fluid-structure interaction model that combines soil mechanics (saturated sediments), fluid mechanics (seawater or air), and solid mechanics (structures). The formulation combines the Material Point Method, which models large deformation of the porous media and the structure, with the Implicit Continuous-fluid Eule...

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 isotache viscosity and the paradigm of the critical state soil mechanics that is the uniqueness of the critical state friction...

This paper presents a constitutive model enabled to simulate monotonic and cyclic behaviour of clay and sand in a unified framework. The bounding surface concept has been utilized to predict a smooth transition from elastic to plastic state of the soil. A new dilatancy relation is proposed to capture the volumetric behaviour of sand and clay in a u...

In this paper, based on the bounding surface theory a new constitutive model for unified simulation of clay and sand is proposed. This model makes use of the critical state and state parameter concepts. To represent the volumetric behaviour of clay and sand in a unified manner, the model employs a general dilatancy rule. An isotropic hardening law...

A systematical testing program on frozen Onsøy clay under isotropic loading and undrained shearing at different temperatures (− 3 ~ − 10 °C), strain rates (0.2~5%/h) and initial Terzaghi effective stress (20~400 kPa) was conducted with the focus on pore pressure development. It is meant to increase the understanding and facilitate the development o...

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 examined the methods to interpolate, hindcast and forecast temperature measurements within the active layer and shallow permafrost...

In this paper, the transport of sub-cooled water across a partially frozen soil matrix (frozen fringe) caused by a temperature difference over the fringe, is described using non-equilibrium thermodynamics. A set of coupled transport equations of heat and mass is presented; implying that, in the frozen fringe, both driving forces of pressure and tem...

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 the ice lens to grow. Upon further penetration of the freezing front, the relative permeability of the soil around the growing...

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 consolidated value (K0NC), is often used. Where K0NC is as a function of friction angle (φ). These relationships do not disting...

Simulating the submarine debris flows is challenging as it involves a complexinteraction between debris flow (solid) and seawater (fluid). However, debris flow simulationin literature relied on only either particle-based method or Computational Fluid Dynamics(CFD). This paper presents a different approach to simulate the solid-fluid interaction (e....

This paper reviews eight geo-acoustic models applied to frozen soils: crystal growth models (grain cementing, grain coating, matrix supporting and pore filling), the weighted equation model (WE), Zimmerman and King's model (KT), the Biot-Gassmann theory modified by Lee (BGTL) and a Two-end member model. We verify the capacity of these models to est...

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. This means that existing formulations (i.e. of the flow potential) are thermodynamically sound. The key assumptions are that the fr...

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) and P-wave velocity Vp is a concave function. An increase of temperature, fine content, and salinity results in a decrease of...

Considering population growth and value of land, the precise modeling of tunneling would be revealed. Although various methods of tunneling exist, all of them are interacted with the porous media around excavation Field. Since all formations have their specific charac-terization, simulation should contemplate these geotechnical behavior through spe...

Modern soil mechanics (geotechnical engineering) was developed as a branch of civil engineering from the 1920's. While modern porous media physics was developed as a branch of physics and applied mathematics from roughly the same period of time. In soil mechanics the main concern is often on the deformations, resulting from mechanical, hydraulic, o...

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 of soil grains and ice. The model is able to represent the behavior of frozen soils in different temperatures and ice contents...

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 saturation on the mechanical behavior and in plastic deformation on the hydraulic behavior. The mechanical and hydraulic behaviors...

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 (FP7/2007–2013) of the EC under grant agreement PIAG-GA-2011-286397. The project aimed at establishing a consensus in creep...

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 amount of ice. The amount of ice depends on the temperature and the applied mechanical stresses. The influence of ice content and...

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 of ice depends on the temperature and the applied mechanical stresses. Considering the highly rate dependent behavior of ice, r...

The Gibs free energy for ice is less than unfrozen water. Hence, wherever ice and unfrozen water coexist, there is a pressure difference between them, which is called cryogenic suction. Cryogenic suction depends on temperature and it causes ice to absorb water. In case of frozen soils, this phenomenon makes the pore ice crystals and therefore the s...

In general, a saturated frozen soil sample, as a composite material, consists of soil grains, ice and unfrozen water. The mechanical behavior of this kind of geomaterial is strongly affected by the amount of ice that fills the pore spaces. On the other hand, the amount of ice in a frozen soil sample depends on temperature and applied mechanical str...

In this paper a constitutive model formulated in the framework of multilaminate concept is applied to analyse pipe-jacking processes. The multilaminate-based models consider various integration planes to formulate the stress-strain relationship. This basic feature of the framework has the advantage that yield criteria, flow and hardening rules are...

Simultaneous flow of two or three immiscible fluids in porous media is modeled by a system of coupled and highly nonlinear partial differential equations. These equations are reduced to a system of algebraic equations by the use of numerical methods. Selecting the proper primary variables is a critical step in efficiently solving of multiphase subs...

This is the second paper of a series where we introduce a control volume based finite element method (CVFEM) to simulate multiphase flow in porous media. This is a fully conservative method able to deal with unstructured grids which can be used for representing any complexity of reservoir geometry and its geological objects in an accurate and effic...

Simultaneous flow of two or three immiscible fluids in porous media is modeled by a system of coupled and highly nonlinear partial differential equations. These equations are reduced to a system of algebraic equations by the use of numerical methods. Selecting the proper primary variables is a critical step in efficiently solving of multiphase subs...

Simultaneous flow of two or three immiscible fluids in porous media is modeled by a system of coupled and highly nonlinear partial differential equations. These equations are reduced to a system of algebraic equations by the use of numerical methods. Selecting the proper primary variables is a critical step in efficiently solving of multiphase subs...

Applying the standard Galerkin finite element method for solving flow problems in porous media encounters some difficulties such as numerical oscillation at the shock front and discontinuity of the velocity field on element faces. Discontinuity of velocity field leads this method not to conserve mass locally. Moreover, the accuracy and stability of...

The differential equations governing the 3D dynamic behavior of saturated porous media are derived and solved with numerical algorithms. The finite elements and Newmark's methods are used to discrete the differential equations in spatial and time domain respectively. A cubic element with 20-nodes and 68 degree of freedom is applied for finite eleme...

A semi-micromechanical multilaminate model is introduced here to predict the mechanical behavior of soils. This model is like a bridge between micro and macro scale upon the satisfaction of minimum potential energy level during any applied stress/strain increments. The concept of this model is based on a certain number of sampling planes which cons...

Numerical solutions are widely used as screening tools for estimating the potential of contaminant transport in groundwater. Finite element with Galerkin method is common for numerical solution of these problems. However advection, diffusion terms and their interactions in the differential equation of contaminant transport caused some oscillations...

Pipe splitting is a recently developed technique that has been proposed for ‘online’ replacement of ductile iron and steel pipes. This technique has advantages associated with the continuous and pseudo-static form of expansion employed. One of the most important considerations for the design of pipe splitting operation is the pattern of ground disp...