Coupled multiphase flow and elasto-plastic modelling of in-situ gas injection experiments in saturated claystone (Mont Terri Rock Laboratory)

Xu, Wen; Shao, Hua; Hesser, Jürgen; Wang, Wenqing; Schuster, Kristof; Kolditz, Olaf

doi:10.1016/j.enggeo.2013.02.005

Cited by 45 publications

(19 citation statements)

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“…During the long-term operation of a deep geological repository for disposal of high-level nuclear waste, a large amount of gas will be produced by anaerobic corrosion of metals, radiolysis of water and microbial degradation of organic materials. Profound understanding of gas migration mechanism in buffer/backfill materials with ultra-low permeability is obligatory for safety assessment of the deep geological repository (Xu et al, 2013;Ye et al, 2014;Liu et al, 2015;Vishal et al, 2015c). Therefore, determination of gas permeability of geo-materials, especially for those with low or ultra-low permeability, is of great theoretical and practical importance.…”

Section: Introductionmentioning

confidence: 97%

Investigation on gas migration in saturated materials with low permeability

et al. 2015

Engineering Geology

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International audienceInvestigation of the hydro-mechanical effects on gas migration in saturated materials with low permeabilityis of great theoretical and practical significances in many engineering fields. The conventional two-phaseflow (visco-capillary flow) theory, which regards the capillary pressure as the only controlling factor in gasmigration processes, is commonly adopted to describe the gas flow in geo-materials. However, formaterialswith lowpermeability, the conventional two-phase flow theory cannot properly describe the gasmigration.In this work, hydro-mechanical coupled gas injection tests were conducted. The volumetric variation of theliquid for applying the confining pressure in the specimen cell and the gas flow rate were monitored. Testresults indicate that gas migration is influenced by the capillary pressure and the mechanical stress simultaneously.The two key parameters of the gas entry pressure Pentry and the gas induced-dilatancy pressurePdilatancy are introduced for description of gas migration with respect to the capillary pressure and the mechanicalstress effects, respectively. When the gas injection pressure is smaller than the Pentry and thePdilatancy, the balance between the gas injection pressure and the confining pressure will lead to an intermittentgas flow. Sudden increase of gas flow rate could be observed once the gas injection pressure approachesthe Pentry or the Pdilatancy. For higher gas injection pressures, the mechanical stress effects on gas migrationcould not be neglected. The sudden increase of gas flux under high gas injection pressures could be causedby the mechanical induced-dilatancy of channels, capillary pressure induced-continuous flow pathways, aswell as the failure of sealing-efficiency. The failure of sealing-efficiency is closely related to the differencebetween the gas injection pressure and the confining pressure rather than the properties of the materialtested. Monitoring the volume of liquid for applying confining pressure is helpful for detecting the failureof sealing efficiency and the mechanism of gas breakthrough

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Section: Introductionmentioning

confidence: 97%

Investigation on gas migration in saturated materials with low permeability

et al. 2015

Engineering Geology

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“…In most cases, Finite Element Method (FEM) two-phase Hydro-Mechanical (HM) models are used (e.g. Alonso et al, 2006;Olivella and Alonso, 2008;Arnedo et al, 2008Arnedo et al, , 2013Gerard et al, 2014;Gonzalez-Blanco et al, 2016;Damians et al, 2020;Xu et al, 2013;Guo and Fall, 2018;Dagher et al, 2019;Yang et al, 2020). In these models, the porosity, the intrinsic permeability and/or the gas-entry value are not constant but evolving with the material strain state (Alonso et al, 2006;Olivella and Alonso, 2008;Arnedo et al, 2008Arnedo et al, , 2013Gerard et al, 2014;Gonzalez-Blanco et al, 2016;Damians et al, 2020;Xu et al, 2013;Dagher et al, 2019;Yang et al, 2020) or the gas pressure (Xu et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

“…Alonso et al, 2006;Olivella and Alonso, 2008;Arnedo et al, 2008Arnedo et al, , 2013Gerard et al, 2014;Gonzalez-Blanco et al, 2016;Damians et al, 2020;Xu et al, 2013;Guo and Fall, 2018;Dagher et al, 2019;Yang et al, 2020). In these models, the porosity, the intrinsic permeability and/or the gas-entry value are not constant but evolving with the material strain state (Alonso et al, 2006;Olivella and Alonso, 2008;Arnedo et al, 2008Arnedo et al, , 2013Gerard et al, 2014;Gonzalez-Blanco et al, 2016;Damians et al, 2020;Xu et al, 2013;Dagher et al, 2019;Yang et al, 2020) or the gas pressure (Xu et al, 2013). The expressions governing these evolutions are proposed empirically (Dagher et al, 2019;Xu et al, 2013) or are derived from assumptions regarding the presence of discontinuities in the material matrix (Alonso et al, 2006;Olivella and Alonso, 2008;Arnedo et al, 2008Arnedo et al, , 2013Gerard et al, 2014;Gonzalez-Blanco et al, 2016;Damians et al, 2020;Yang et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Modelling gas fracturing in saturated clay samples using triple-node zero-thickness interface elements

Liaudat

Dieudonné

2023

Computers and Geotechnics

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“…The numerical method for geomaterial has been greatly developed with the progress of modern computational mechanics (Rabczuk and Areias, 2006;Xu et al, 2013;Zhuang et al, 2014aZhuang et al, , 2014bWu et al, 2014). The modeling approaches for undrained triaxial compression test of soil can be generally divided into two classes (Shafipour and Soroush, 2008): (1) Constant volume method.…”

Section: Introductionmentioning

confidence: 99%