Development of Finite Element Code for the Analysis of Coupled Thermo-Hydro-Mechanical Behaviors of a Saturated-Unsaturated Medium

Ohnishi, Y.; Shibata, Hiroaki; Kobayashi, Alkira

doi:10.1016/b978-0-12-701620-7.50053-2

Cited by 26 publications

(8 citation statements)

References 8 publications

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“…The approach being developed for the present study features an unsaturated single-phase fluid flow and vapor diffusion model approach (Liu et al 2006a;Liu et al 2006b) JAEA Japan Atomic Energy Agency's Research Team, including Hazama Cooperation THAMES THAMES is a finite element program for analyzing coupled THM processes in porous and fractured rock developed at the Kyoto University (Ohnishi et al 1987;Ohnishi and Kobayashi, 1996). The code has been extended to unsaturated media with single-phase liquid flow and vapor diffusion in a static gas phase (Chijimatsu et al 2000).…”

Section: Chinese Academy Of Sciences' Research Teammentioning

confidence: 99%

A comparative simulation study of coupled THM processes and their effect on fractured rock permeability around nuclear waste repositories

et al. 2008

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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 the two assumed repository settings, the dominant mechanism of changes in rock permeability was thermalmechanically-induced closure (reduced aperture) of vertical fractures, caused by thermal stress resulting from repository-wide heating of the rock mass. The magnitude of thermal-mechanically-induced changes in permeability was more substantial in the case of an emplacement drift located in a relatively shallow, low-stress environment where the rock is more compliant, allowing more substantial fracture closure during thermal stressing. However, in both of the assumed repository settings in this study, the thermalmechanically induced changes in permeability caused relatively small changes in the flow field, with most changes occurring in the vicinity of the emplacement drifts.

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Section: Chinese Academy Of Sciences' Research Teammentioning

confidence: 99%

A comparative simulation study of coupled THM processes and their effect on fractured rock permeability around nuclear waste repositories

et al. 2008

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“…For Task 2D, the JNC team performed coupled THC simulation of the DST employing three codes: the THM code THAMES [19,20,21], the mass transport code Dtransu [22] and the geochemical code PHREEQE [23]. These three codes are controlled by a coupling system COUPLYS, which can exchange common data between the three codes and synchronize each code in order.…”

Section: Summary Of Modeling Approaches and Resultsmentioning

confidence: 99%

The DECOVALEX III project: A summary of activities and lessons learned

Tsang

Jing

Stephansson

et al. 2005

International Journal of Rock Mechanics and Mining Sciences

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Initiated in 1992, the DECOVALEX project is an international collaboration for advancing the understanding and modeling of coupled thermo-hydromechanical (THM) processes in geologic systems. The project has made important scientific achievements through three stages and is progressing in its fourth stage. It has played a key role in the development of mathematical modeling and in situ testing of coupled THM processes in fractured rock and buffer/backfill materials, a subject of importance for performance assessment of radioactive waste geologic repositories. This paper summarizes studies under the most recent stage of the project, DECOVALEX III (2000)(2001)(2002)(2003). These studies include those of two major field experiments: (a) the FEBEX experiment at Grimsel, Switzerland, investigating coupled THM processes in a crystalline rock-bentonite system, and (b) the Drift Scale Test (DST) experiment at Yucca Mountain, Nevada, investigating coupled THM processes in unsaturated tuff.These are two of the largest multiyear heater tests undertaken to date for the study of coupled THM processes in geological systems. In addition, three so-called benchmark tests are also studied to evaluate the impact of coupled THM processes under different scenarios and geometries. Within the DECOVALEX project, multiple research teams participated in each of the studies, using different approaches and computer codes.Comparisons of results have provided insight into coupled THM processes, which in turn has stimulated further development of our modeling capabilities. Lessons learned from these studies are discussed. The scientific advances and enhanced insight gained through this kind of international cooperation illustrate the effectiveness of the DECOVALEX project.1

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“…The analytical value of the flow-focusing factor for the elliptical fault can be calculated from Eq. (18). Substituting the related parameters into Eq.…”

Section: Theoretical Understanding Of Pore-fluid Flow Patterns Aroundmentioning

confidence: 98%

“…As it was mentioned previously, analytical solutions to benchmark problems provide an important and often unique tool for validating and verifying the numerical methods and algorithms, which can be used to solve the problems of complicated geometries, such as the pore-fluid flow focused heat transfer problems within the upper crust of the Earth (e.g. [18,11,20,31,23,21,2,26,36,38,9]). On the engineeringlength scale, Booker and Savvidou [1] developed an analytical solution for a simplified consolidation problem around a heat source in thermoelastic soils.…”

Section: Introductionmentioning

confidence: 99%

Theoretical and numerical analyses of pore-fluid flow focused heat transfer around geological faults and large cracks

Zhao

Hobbs

Ord

et al. 2008

Computers and Geotechnics

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Development of Finite Element Code for the Analysis of Coupled Thermo-Hydro-Mechanical Behaviors of a Saturated-Unsaturated Medium

Cited by 26 publications

References 8 publications

A comparative simulation study of coupled THM processes and their effect on fractured rock permeability around nuclear waste repositories

A comparative simulation study of coupled THM processes and their effect on fractured rock permeability around nuclear waste repositories

The DECOVALEX III project: A summary of activities and lessons learned

Theoretical and numerical analyses of pore-fluid flow focused heat transfer around geological faults and large cracks

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