Browse > Article
http://dx.doi.org/10.7474/TUS.2019.29.6.439

A Coupled Hydro-Mechanical Analysis of a Deep Geological Repository to Assess Importance of Mechanical Factors of Bentonite Buffer  

Jeon, Yoon-Soo (Department of Civil and Environment Engineering, Korea Advanced Institute of Science and Technology)
Lee, Seung-Rae (Department of Civil and Environment Engineering, Korea Advanced Institute of Science and Technology)
Kim, Min-Seop (Department of Civil and Environment Engineering, Korea Advanced Institute of Science and Technology)
Jeon, Jun-Seo (Building Safety Research Center & Seismic Safety Research Center, Korea Institute of Civil Engineering and Building Technology)
Kim, Min-Jun (Deep Subsurface Research Center, Korea Institute of Geoscience and Mineral Resources)
Publication Information
Tunnel and Underground Space / v.29, no.6, 2019 , pp. 439-455 More about this Journal
Abstract
A buffer is the major component of a high level radioactive waste repository. Due to their thermal conductivity and low permeability, bentonites have been considered as a key component of a buffer system in most countries. The deep geological condition generates ground water inflow and results in swelling pressure in the buffer and backfill. Investigation of swelling pressure of bentonite buffer is an important task for the safe disposal system. The swelling pressure that can be critical is affected by mechanical and hydro properties of the system. Therefore, in this study, a sensitivity analysis was conducted to examine the effect of hydro-mechanical (HM) behaviors in the MX-80 bentonite. Based on the results of the swelling pressure generation with HM model parameters, a coupled HM analysis of an unsaturated buffer and backfill in a deep geological repository was also carried out to investigate the major factor of the swelling pressure generation.
Keywords
Hydro-mechanical behavior; MX-80 bentonite; Numerical analysis; Sensitivity analysis; Deep geological repository;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
1 Sobol, I.M., 1993, "Sensitivity analysis for non-linear mathematical models.", Mathematical Modeling & Computational Experimental, vol.1, pp.407-414.
2 Sobol, I.M., 2001, "Global sensitivity indices for nonlinear mathematical models and their Monte Carlo estimates", Mathematics and Computers in Simulation, vol.55, pp.271-280.   DOI
3 Toprak, E., Mokni, N., Olivella, S., 2013, "Thermo-hydro-mechanical modelling of buffer", POSIVA OY, Synthesis Report.
4 van Genuchten, M.Th., 1980, "A closed-form equation for predicting the hydraulic conductivity of unsaturated soils", Soil Science Society of America Journal, vol.44, pp. 892-898.   DOI
5 SKB, 1992, "Treatment and final disposal of nuclear waste, SKB RD&D Programme 92", Swedish Nuclear Fuel and Waste Management.
6 Kozeny, J., 1927, "Ueber kapillare Leitung des Wassers im Boden." Sitzungsber Akad. Wiss., Wien, vol.136(2a), pp. 271-306.
7 Akesson, M., Kristensson, O., Borgesson, L., Dueck, A., 2010 "THM modelling of buffer, backfill and other system components, Swedish Nuclear Fuel and Waste Management", Technical Report, TR-10-11.
8 Alonso, E.E., Gens, A., Josa, A., 1990, "A constitutive model for partially saturated soils," Geotechnique, vol.40, pp.405-430.   DOI
9 Choi, H.J., Lee, J.Y., Kim, S.S., 2008, "Korean reference HLW disposal system", Journal of the Korean Radioactive Waste Society, Technical Report, KAERI/TR-3563.
10 Gens, A., Sanchez, M., Guimaraes, L.D., Alonso, E.E., Lloret, A., Olivella, S., Villar, M.V., Huertas, F., 2009, "A full-scale in situ heating test for high-level nuclear waste disposal: observations, analysis and interpretation," Geotechnique, vol.4, pp.377-399.
11 Kwon, S., 2012, "Tunneling technology", Magazine of Korean tunneling and underground space association, vol.14, pp.32-48.
12 Lee, J.O., Choi, W.J., Kwon, S., 2011, "Thermal-hydro-mechanical properties of reference bentonite buffer for a Korean HLW repository," Tunnel and Underground Space, vol.21, pp.264-273.   DOI
13 Saba, S., 2014, "Hydro-mechanical behaviour of bentonite-sand mixture used as a sealing materials in radioactive waste disposal galleries", Doctor Thesis, Paris-Est. Univ.
14 Li, X., Zhang, C., Rohling, K.J., 2013, "Simulations of THM processes in buffer-rock barriers of high-level waste disposal in an argillaceous formation", Journal of Rock Mechanics and Geotechnical Engineering, vol.5, pp.277-286.   DOI
15 Mariner, P.E., Lee, J.H., Hardin, E.L., Hansen, F.D., Freeze, G.A., Lord, A.S., Goldstein, B., Price, R.H., 2011, Granite disposal of U.S. high-level radioactive waste, Sandia report, SAND2011-6203.
16 McKay, M.D., Beckman, R.J., Conover, W.J., 2000, "A comparison of three methods for selecting values of input variables in the analysis of output from a computer code", American Statistical Association and American Society for Quality, vol.42, pp.56-61.