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http://dx.doi.org/10.7474/TUS.2020.30.3.193

Penetration of Compacted Bentonite into the Discontinuity in the Excavation Damaged Zone of Deposition Hole in the Geological Repository  

Lee, Changsoo (Korea Atomic Energy Research Institute)
Cho, Won-Jin (Korea Atomic Energy Research Institute)
Kim, Jin-Seop (Korea Atomic Energy Research Institute)
Kim, Geon-Young (Korea Atomic Energy Research Institute)
Publication Information
Tunnel and Underground Space / v.30, no.3, 2020 , pp. 193-213 More about this Journal
Abstract
A mathematical model to simulate more realistically the penetration of compacted bentonite buffer installed in the deposition hole into the discontinuity in the excavation damaged zone formed at the inner wall of the deposition hole in the geological repository for spent fuel is developed. In this model, the penetration of compacted bentonite is assumed to be the flow of Bingham fluid through the parallel planar rock fracture. The penetration of compacted bentonite is analyzed using the developed model. The results show that the maximum penetration depth of compacted bentonite into the rock fracture is proportioned to the swelling pressure of saturated compacted bentonite and the aperture of rock fracture. However, it is in inverse proportion to the yield strength of compacted bentonite. The viscosity of compacted bentonite dominates the penetration rate of compacted bentonite, but has no influence to the maximum penetration depth.
Keywords
Compacted Bentonite; Buffer; Excavation Damaged Zone; Penetration; Maximum Penetration Depth; Penetration Rate;
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Times Cited By KSCI : 2  (Citation Analysis)
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1 Apted, M.J., R. Arthur, D. Bennett, D. Savage, G. Sallfors and H. Wennerstrom, 2010. Buffer erosion: An overview of concepts and potential safety consequences. SSM Report 2010:31, Swedish Radiation Safety Authority, Stockholm, Sweden.
2 Bird, R., W. Stewart, and E, Lightfoot, 2002, Transport Phenomena, Wiley.
3 Borgesson, L., M. Hedstrom, M. Birgersson, and O. Karnland, 2018, Bentonite swelling into fractures at conditions above the critical coagulation concentration, Swedish Nuclear Fuel and Waste Management Company, TR 17-11, Svensk Karnbranslehantering AB.
4 Cho, W.J., J.O. Lee, and S. Kwon, 2012, An analysis of the factors affecting the hydraulic conductivity and swelling pressure of Kyungju Ca-bentonite for use as a clay-based sealing material for a high-level waste repository, Nuclear Engineering and Technology, 44, 89-102.   DOI
5 Grindrod, P., M. Peletier, and H. Takase, 1999, Mechanical interaction between swelling compacted clay and fractured rock and the leaching of clay colloids, Engineering Geology, 54, 159-165.   DOI
6 Gustafson, G. and H. Stille, 1996, Prediction of groutability from grout properties and hydrological data, Tunneling and Underground Space Technology, 11, 325-332.   DOI
7 Gustafson, G. and H. Stille, 2005, Stoping criteria for cement grouting, Felsbau, 23, 62-68.
8 Hassler, L., 1991, Grouting of rock - Simulation and classification, Ph D. Thesis, Dept. of Soil and Rock Mechanics, KTH Stockholm, Sweden.
9 Hiemenz, P., 1986, Principles of Colloid and Surface Chemistry, Marcel Dekker, NY.
10 Kanno, T., K. Matsumoto, and H. Sugino, 1999, Evaluation of extrusion and erosion of bentonite buffer, Proc. 7th Int. Conf. on Radioactive Waste Management and Environmental Remediation.
11 Kanno, T. and Y. Iwata, 2004, Study on model for bentonite buffer intrusion (II), Japan Nuclear Cycle Development Institute, JNC TJ8400 2003-083 (in Japanese).
12 Kobayashi, S. and H. Stille, 2007, Design for rock grouting based on analysis of grout penetration, Verification using Aspö HRL data and parameter analysis, Swedish Nuclear Fuel and Waste Management Company, R-07-13, Svensk Karnbranslehantering AB.
13 Komine, H., 2004, Simplified evaluation for swelling characteristics of bentonites, Engineering Geology, 71, 265-279.   DOI
14 Lee, C., 2012, Characterization of Thermal-Mechanical Behavior of Rock Mass in the Excavation Damaged Zone at KURT. Ph.D. Thesis, Seoul National University, Korea (in Korean with English abstract).
15 Lee, C., S. Kwon, J.W. Choi and S. Jeon, 2011, An Estimation of the Excavation Damaged Zone at the KAERI Underground Research Tunnel, Tunnel and Underground Space, 21(5), 359-369.   DOI
16 Lloret, A., M. V. Villar, M. Sanchez, A. Gens, X. Pintado, and E. E. Alonso, 2003, Mechanical behaviour of a heavily compacted bentonite under high suction changes, Geotechnique, 53, 27-40.   DOI
17 Moreno, L., I. Neretnieks, and L. Liu, 2010, Modelling of erosion of bentonite gel by gel/sol flow, Swedish Nuclear Fuel and Waste Management Company, TR 10-64, Svensk Karnbranslehantering AB.
18 Neretnieks, I., L. Liu, and L. Moreno, 2009, Mechanisms and models for bentonite erosion, Swedish Nuclear Fuel and Waste Management Company, TR 09-35, Svensk Karnbranslehantering AB.
19 Park, S. and S. Kwon, 2017, Status of Researches of Excavation Damaged Zone in Foreign Underground Research Laboratories Constructed for Developing High-level Radioactive Waste Disposal Techniques, Explosives and Blasting, 35(3), 31-54.
20 Pusch, R., 1983, Stability of bentonite gels in crystalline rock- physical aspects, Swedish Nuclear Fuel and Waste Management Company, TR 83-04, Svensk Karnbranslehantering AB.
21 SKB, Svensk Karnbranslehantering AB, 2010, Choice of Method - Evaluation of Strategies and Systems for Disposal of Spent Nuclear Fuel. Report P-10-47.
22 Svoboda, J., 2013, The experimental study of bentonite swelling into fissure, Clay Minerals, 48, 383-389.   DOI
23 Kwon, S., Lee, C.S., Cho, S.J., Jeon, S.W., Cho, W.J., 2009. An investigation of the excavation damaged zone at the KAERI underground research tunnel, Tunn. Undergr. Space Technol. 24, 1-13.   DOI
24 Tang, A., Y. Yui, and N. Barnel, 2008, Thermo-mechanical behaviour of a compacted swelling clay, Geotechnique, 58, 45-54.   DOI
25 Yui, Y., A. Tang, L. Qian, W. Yei, and B. Chen, 2011, Thermo-mechanical behaviour of compacted GMZ bentonite, Soils and Foundations, 51, 1065-1074.   DOI
26 Asada, M. and S. Horiuchi, 2005, High-density bentonite slurry for seepage barrier, J. of Materials in Civil Engineering, 17, 178-187.   DOI
27 Birgersson, M., L. Borgesson, M. Hedstrom, O. Karnland, and U. Nilsson, 2009, Bentonite erosion, Final report, Swedish Nuclear Fuel and Waste Management Company, TR 09-34, Svensk Karnbranslehantering AB.
28 Gustafson, G., J. Claesson, and A. Fransson, 2013, Steering parameters for rock grouting, J. of Applied Mathematics, Vol. 2013, Article ID 269594.
29 Tanai, K. and K. Matsumoto, 2008, A study of extrusion behavior of buffer material into fractures, Science & Technology Series No 334, 57-64.