2008
DOI: 10.1007/s00254-008-1552-1
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A comparative simulation study of coupled THM processes and their effect on fractured rock permeability around nuclear waste repositories

Abstract: This paper presents an international, multiple-code, simulation study of coupled thermal, hydrological, and mechanical (THM) processes and their effect on permeability and fluid flow in fractured rock around heated underground nuclear waste emplacement drifts. Simulations were conducted considering two types of repository settings: (a) open emplacement drifts in relatively shallow unsaturated volcanic rock, and (b) backfilled emplacement drifts in deeper saturated crystalline rock. The results showed that for … Show more

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Cited by 58 publications
(37 citation statements)
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“…Indeed, ROCMAS is a finite element code for fully coupled THM analysis under single phase, unsaturated flow conditions, whereas TOUGH-FLAC is based on the sequential coupling of a finite volume fluid flow code to a finite difference geomechanical code, but with full multiphase flow capability-see Wang et al, (2010), for a recent discussion on single-versus-multiphase fluid flow modeling approaches for this type of problem). The results in Figure 4.4.7-2 are also in general agreement with simulation results of other numerical models for the same DECOVALEX bench-mark test presented in Rutqvist et al (2008bRutqvist et al ( , 2009d. .4.7-2d is of utmost interest here because it shows the evolution of stress as a result of three sources: (1) swelling stress caused by saturation changes, (2) poro-elastic stress from fluid pressure changes under saturated conditions, and (3) thermal stress.…”
Section: Tough-flac Simulation Of a Bentonite-backfilled Nuclear Wastsupporting
confidence: 78%
“…Indeed, ROCMAS is a finite element code for fully coupled THM analysis under single phase, unsaturated flow conditions, whereas TOUGH-FLAC is based on the sequential coupling of a finite volume fluid flow code to a finite difference geomechanical code, but with full multiphase flow capability-see Wang et al, (2010), for a recent discussion on single-versus-multiphase fluid flow modeling approaches for this type of problem). The results in Figure 4.4.7-2 are also in general agreement with simulation results of other numerical models for the same DECOVALEX bench-mark test presented in Rutqvist et al (2008bRutqvist et al ( , 2009d. .4.7-2d is of utmost interest here because it shows the evolution of stress as a result of three sources: (1) swelling stress caused by saturation changes, (2) poro-elastic stress from fluid pressure changes under saturated conditions, and (3) thermal stress.…”
Section: Tough-flac Simulation Of a Bentonite-backfilled Nuclear Wastsupporting
confidence: 78%
“…change in swelling pressure due to porewater chemistry changes) couplings. Coupled THM models have been developed in Rutqvist et al (2009Rutqvist et al ( , 2011Rutqvist et al ( , 2014aRutqvist et al ( , 2014b. The results from the model developed in Rutqvist et al (2014b) show that it takes about 2780 years to fully saturate the EBS bentonite if the interaction between micro-and macrostructures is considered.…”
Section: Relevant Processesmentioning
confidence: 99%
“…3). The large-scale analysis included complete THM analysis of rock and bentonite buffer, to calculate the evolution of temperature, fluid pressure, bentonite saturation and swelling, and thermal stresses (see Rutqvist et al 2008b). …”
Section: Model Setupmentioning
confidence: 99%