Thermo-hydro-mechanical characterisation of a bentonite-based buffer material by laboratory tests and numerical back analyses

Börgesson, Lennart; Chijimatsu, Masakazu; Fujita, Tomoo; Nguyen, Thanh Son; Rutqvist, Jonny; Jing, Lanru

doi:10.1016/s1365-1609(00)00067-8

Cited by 73 publications

(32 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The THAMES code has been extensively applied in earlier phases of the DECOVALEX project for THM analysis in bentonite-rock systems (e.g. Börgesson et al 2001;Chijimatsu et al 2005;Millard et al 2005). The complete data set for welded tuff includes multiphase (e.g., retention and relative permeability data for gas and liquid) fluid flow properties for matrix and fracture continua.…”

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

View full text Add to dashboard Cite

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.

show abstract

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

View full text Add to dashboard Cite

show abstract

“…The swelling pressure for FEBEX bentonite, ranging from 4.5 MPa (Castellanos et al, 2008) to 7 MPa (ENRESA, 2000), is higher than the swelling pressure for Kunigel-VI bentonite, with a swelling pressure of around 1 MPa (Börgesson et al 2001;Komine and Ogata, 1996) measured using distilled water. Therefore the  SW in Equation (2-4) for FEBEX bentonite is 0.238 , which is higher than that used for Kunigel-VI bentonite (0.048).…”

Section: Cases For Febex Bentonitementioning

confidence: 96%

“…July 2015 Kunigel-VI bentonite (Börgesson et al 2001) under the condition that bentonite is saturated with dilute solution (e.g. deionized water), and K is 20 MPa .…”

mentioning

confidence: 99%

Investigation of Coupled Processes and Impact of High Temperature Limits in Argillite Rock

Zheng¹,

Rutqvist²,

Steefel³

et al. 2014

View full text Add to dashboard Cite

“…Under geological disposal conditions bentonite will progressively hydrate and swell filling up the existing technological gaps. Various laboratory and in-situ experiments were conducted in the past to characterize the Hydro-Mechanical (HM) behaviour of these materials ( [2], [3], [5], [7][8][9][10][11][12], [17], [18], [20]). However, little attention has been paid to the role and influence of technological gaps on the HM properties of the sealing materials during the saturation phase and especially on the degree of homogeneity of the bentonite based core at the end of the transient period.…”

Section: Introductionmentioning

confidence: 99%

SEALEX in-situ experiments-performance tests of repository seals: experimental observations and modelling

Mokni

Barnichon

2016

E3S Web Conf.

View full text Add to dashboard Cite

ABSTRACT. The paper describes observations and numerical analysis of SEALEX performance tests installed in Tournemire Underground Research Laboratory (URL). One of the objectives of the large scale in-situ tests is to investigate the impact of technological gaps on the long term performance of bentonite based seals. The swelling cores consist of precompacted blocks of a natural sodic Wyoming bentonite (MX80 type) mixed with quartz sand in a ratio of 70/30 (in dry mass) with different geometries (monolithic disks or four jointed disks). Several technological gaps exist within the in situ tests: Gaps between the blocks and annular gap with variable width between the bentonite-based core and the host rock. All the tests are extensively instrumented for monitoring the main Hydro-Mechanical (HM) variables. Comparison of the experimental results showed that the presence of technological gaps constituted new hydration sources (annular gaps) and flow paths (gaps between the blocks) that changed the saturation kinetics. A coupled HM formulation that incorporates the relevant processes involved in the problem under consideration has been adopted to analyse the effect of the annular technological gap on dry density homogenization of the bentonite based core as hydration progresses. Technological gaps were demonstrated to have an impact on dry density distribution.

show abstract

Thermo-hydro-mechanical characterisation of a bentonite-based buffer material by laboratory tests and numerical back analyses

Cited by 73 publications

References 5 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

Investigation of Coupled Processes and Impact of High Temperature Limits in Argillite Rock

SEALEX in-situ experiments-performance tests of repository seals: experimental observations and modelling

Contact Info

Product

Resources

About