The influence of coupled physical swelling and chemical reactions on deformable geomaterials

Ma, Yue; Chen, Xiaohui; Hosking, Lee J.; Yu, Hai‐Sui; Thomas, Hywel Rhys; Norris, Simon

doi:10.1002/nag.3134

Cited by 7 publications

(4 citation statements)

References 34 publications

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“…Only borehole problems are considered to illustrate the present theoretical development, however this technique can be employed for any THM coupled problems. It can be also extended to other numerical method involving the time derivative terms or THM problems coupling with chemical reaction 31 …”

Section: Discussionmentioning

confidence: 99%

A hybrid Laplace‐Galerkin method for thermo‐hydro‐mechanical coupling in fluid saturated porous media: Application for borehole problems

Nguyen‐Sy

Nguyen

2021

Num Anal Meth Geomechanics

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A hybrid Laplace‐Galerkin method is proposed for modeling thermo‐hydro‐mechanical coupled problems of fluid saturated porous media in unsteady state regime. It consists of transforming the weak form equations into the Laplace space where they are solved by the Galerkin finite element method. Results in time space are then obtained by the Stehfest method of inverse Laplace transformation. This technique does not require any time stepping comparing to the traditional implicit or explicit time discretization method. Its exactitude is confirmed by comparing with existent analytical results as well as the one obtained by the implicit time stepping method.

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Section: Discussionmentioning

confidence: 99%

A hybrid Laplace‐Galerkin method for thermo‐hydro‐mechanical coupling in fluid saturated porous media: Application for borehole problems

Nguyen‐Sy

Nguyen

2021

Num Anal Meth Geomechanics

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“…This theory uses entropy production as the driving force to build a unified multi-field coupled theory which covers both coupling effects between solid deformation, hydraulic field, heat transfer, and chemical reaction, and the phenomenological interaction between fluid flow, chemical flow and heat flow. Mixture Coupling Theory has been used to derive the hydro-geomechanical (Chen, 2013;Chen and Hicks, 2011), hydro-geomechanical-chemical and THGC models (Chen and Hicks, 2013;Ma et al, 2021).…”

Section: Coupled Thermo-hydro-geomechanical Phenomenamentioning

confidence: 99%

Occurrence and ecotoxicological effects of fires at municipal solid waste landfills

Mohammad

Paleologos

Ogrodnik

et al. 2024

Environmental Geotechnics

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Surface and sub-surface fire in municipal solid waste landfills (including dumpsites) is a complex and intricate phenomenon, whose frequency is expected to increase due to climate change. Partial or incomplete combustion of landfill waste at low temperatures during fires leads to generation of toxic compounds, including hydrocarbons, particulate matter and hazardous gases, which contaminate the surrounding geoenvironment and ultimately pose severe health hazards to living entities. Under these circumstances, it is the need of the hour to understand the (i) occurrence mechanisms of landfill fires, (ii) waste properties and operational conditions that may favour landfill fires and (iii) strengths and limitations of the available detection techniques in order to provide recommendations to detect such incidences at an early stage and plan emergency measures. Hence, the present review article critically assimilates the literature on landfill fires and discusses the (a) conditions under which the initiation and sustenance of landfill fires take place, (b) ecotoxicological (geoenvironmental) hazards of landfill fires, both in short- and long-term and (c) detection techniques for an early warning system. Finally, a discussion on the coupled multi-physics interactions undergoing in the waste matrix during landfill fires is presented in this manuscript, which is crucial to mastering this subject.

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“…Recently, mixture coupling theory, which was previously called modified mixture theory, was developed by Heidug and Wong (Heidug and Wong 1996), has been used to build more advanced coupled models in geomechanics and geophysics (Chen and Hicks 2013a, Chen et al 2013b, Ma et al 2021. Instead of discriminating between solid and fluid phases, as the previous mixture theory does, mixture coupling theory treats the fluid-infiltrated system as a single continuum material.…”

Section: Introductionmentioning

confidence: 99%

New Unsaturated Dynamic Porosity Hydromechanical Coupled Model and Experimental Validation

Wang

Howlett

et al. 2022

Int. J. Geomech.

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Constitutive coupled modeling has developed rapidly in recent decades, with numerous new models published. However, few models consider dynamic porosity, and experimental validation of such a model remains a challenge due to multiple variables. In this study, a new constitutive model for unsaturated soil with dynamic porosity was developed and validated using test data from two experimental studies that yielded good results (relative average error AVRE = 0.8631-1.3046, R 2 = 0.9028-0.9981). The sensitivity of the model to the four primary parameters was analyzed to investigate the influence of model properties on the hydraulic and mechanical behavior. Results show that the calculation of volumetric strain is most sensitive to Young's modulus (E), while the calculation of specific water volume is most sensitive to permeability (k). Also, the sensitivity of the parameters changes with their value. Modeled results show that the porosity change significantly affects both hydraulic and mechanical behavior, even when soil undergoes relatively low deformation. Relative calculation error decreases notably after porosity change is considered (44.9% and 35.2% improvement in two different calculations). This study also finds that dynamic porosity affects the deformation energy of solids.

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The influence of coupled physical swelling and chemical reactions on deformable geomaterials

Cited by 7 publications

References 34 publications

A hybrid Laplace‐Galerkin method for thermo‐hydro‐mechanical coupling in fluid saturated porous media: Application for borehole problems

A hybrid Laplace‐Galerkin method for thermo‐hydro‐mechanical coupling in fluid saturated porous media: Application for borehole problems

Occurrence and ecotoxicological effects of fires at municipal solid waste landfills

New Unsaturated Dynamic Porosity Hydromechanical Coupled Model and Experimental Validation

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