All Issue

2019 Vol.29, Issue 6 Preview Page

Original Article

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

심층 처분 시설의 수리 역학적 해석을 통한 벤토나이트 버퍼의 역학적 영향 인자 중요도 평가

Yoon-Soo Jeon1
,
Seung-Rae Lee2*
,
Min-Seop Kim3
,
Jun-Seo Jeon4
,
Min-Jun Kim5
전 윤수1
,
이 승래2*
,
김 민섭3
,
전 준서4
,
김 민준5
1Master, Department of Civil and Environment Engineering, Korea Advanced Institute of Science and Technology
2Professor, Department of Civil and Environment Engineering, Korea Advanced Institute of Science and Technology
3Ph.D. Candidate, Department of Civil and Environment Engineering, Korea Advanced Institute of Science and Technology
4Senior Researcher, Building Safety Research Center & Seismic Safety Research Center, Korea Institute of Civil Engineering and Building Technology
5Postdoctoral Researcher, Deep Subsurface Research Center, Korea Institute of Geoscience and Mineral Resources
1한국과학기술원 건설및환경공학과 석사
2한국과학기술원 건설및환경공학과 교수
3한국과학기술원 건설및환경공학과 박사과정
4한국건설기술연구원 국민생활연구본부 & 건축안전연구센터 수석연구원
5한국지질자원연구원 심지층연구센터 박사후연구원
* Corresponding Author
31 December 2019. pp. 439-455
PDF XML Citation
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

완충재는 심지층 고준위 방사성 폐기물 저장소의 주요 구성 요소이다. 벤토나이트는 높은 열전도율과 낮은 수리투과성의 특성으로 완충재의 핵심 구성 요소로 다수의 국가에서 채택되었다. 심층 처분은 지하수 유입을 일으키고 이는 완충재 및 뒷채움재의 팽윤압을 초래한다. 완충재에서 발생하는 고압의 팽윤압은 처분용기에 영향을 줄 수 있기에 정밀한 완충재의 팽윤압 예측은 안전한 처분 시스템 구축에 있어서 필수적이다. 따라서 본 연구에서는 MX-80 벤토나이트의 수리역학적 거동에 대한 팽윤압 예측 모델을 세우고, 그 결과를 토대로 민감도 분석을 시행하였다.

키워드
수리-역학적 인자
MX-80 벤토나이트
수치 해석
민감도 분석
고준위 방사성 폐기물
References
1
Akesson, M., Kristensson, O., Börgesson, L., Dueck, A., 2010 “THM modelling of buffer, backfill and other system components, Swedish Nuclear Fuel and Waste Management”, Technical Report, TR-10-11.
2
Alonso, E.E., Gens, A., Josa, A., 1990, “A constitutive model for partially saturated soils,” Geotechnique, vol.40, pp.405-430.
10.1680/geot.1990.40.3.405
3
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.
4
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.
10.1680/geot.2009.59.4.377
5
Kozeny, J., 1927, “Ueber kapillare Leitung des Wassers im Boden.” Sitzungsber Akad. Wiss., Wien, vol.136(2a), pp. 271-306.
6
Kwon, S., 2012, “Tunneling technology”, Magazine of Korean tunneling and underground space association, vol.14, pp.32-48.
7
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.
8
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.
10.1016/j.jrmge.2012.09.002
9
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.
10
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.
11
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.
12
SKB, 1992, “Treatment and final disposal of nuclear waste, SKB RD&D Programme 92”, Swedish Nuclear Fuel and Waste Management.
13
Sobol, I.M., 1993, “Sensitivity analysis for non-linear mathematical models.”, Mathematical Modeling & Computational Experimental, vol.1, pp.407-414.
14
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.
10.1016/S0378-4754(00)00270-6
15
Toprak, E., Mokni, N., Olivella, S., 2013, “Thermo-hydro-mechanical modelling of buffer”, POSIVA OY, Synthesis Report.
16
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.
10.2136/sssaj1980.03615995004400050002x
Information
  • Publisher :Korean Society for Rock Mechanics and Rock Engineering
  • Publisher(Ko) :한국암반공학회
  • Journal Title :Tunnel and Underground Space
  • Journal Title(Ko) :터널과 지하공간
  • Volume : 29
  • No :6
  • Pages :439-455
  • Received Date : 2019-10-18
  • Revised Date : 2019-11-18
  • Accepted Date : 2019-11-26
  • DOI :https://doi.org/10.7474/TUS.2019.29.6.439
Journal Informaiton Tunnel and Underground Space Tunnel and Underground Space
Online Submission
Archives
: Vol.27, 2017 ~
  • NRF
  • KOFST
  • KISTI Current Status
  • KISTI Cited-by
  • crosscheck
  • orcid
  • open access
  • ccl
Journal Informaiton Journal Informaiton - close