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http://dx.doi.org/10.9720/kseg.2021.1.055

Hydraulic-Mechanical Modeling on Fracture Transmissivity Evolution Around a Borehole  

Choi, Chae-Soon (Korea Atomic Energy Research Institute)
Park, Kyung-Woo (Korea Atomic Energy Research Institute)
Park, Byeong-Hak (Korea Atomic Energy Research Institute)
Ko, Nak-Youl (Korea Atomic Energy Research Institute)
Ji, Sung-Hoon (Korea Atomic Energy Research Institute)
Publication Information
The Journal of Engineering Geology / v.31, no.1, 2021 , pp. 55-66 More about this Journal
Abstract
Hydraulic-mechanical (H-M) coupled numerical modeling was used to evaluate the evolution of hydrogeological properties in response to the installation and expansion of a borehole. A domain with a discrete fracture network was adopted for discontinuum modeling to simulate changes in fracture apertures. Comparison with real hydraulic test data shows that the effects of principal stress direction and expansion of borehole diameter were reasonably simulated by H-M coupled numerical modeling. The modeling confirmed that aperture changes depended on the principal stress direction, with an increase in aperture size due to vertical displacement being the dominant effect. A concentration of shear dilation around the borehole had an additional, subsidiary, effect on the hydrogeological evolution. These results show that the permeability of fractured rock can be increased by changing the hydraulic properties of a fracture through stress redistribution caused by the installation and expansion of a borehole.
Keywords
discrete fracture network; discontinuum modeling; vicinity of borehole; aperture change;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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1 Cho, H., Cheong, J.Y., Lim, D.H., Hamm, S.Y., 2017, Quantification of heterogenous background fractures in bedrocks of Gyeongju LILW disposal site, The Journal of Engineering Geology, 27(4), 463-474 (in Korean with English abstract).   DOI
2 Fox, A., Forchhammer, K., Pettersson, A., La Pointe, P., Lim, D.H., 2012, Geological discrete fracture network model for the Olkiluoto site, Eurajoki, Finland, Version 2.0; POSIVA 2012-27, POSIVA OY, Eurajoki, Finland.
3 Hartley, L., Hoek, J., Swan, D., Roberts, D., Joyce, S., Follin, S., 2009, Development of a hydrogeological discrete frcture network model for the Olkiluoto site descriptive model 2008; Working report 2009-61, POSIVA OY, Eurajoki, Finland.
4 Ji, S.H., Park, K.W., Lim, D.H., Kim, C., Kim, K.S., Dershowitz, W., 2012, A hybrid modeling approach to evaluate the groundwater flow system at the low- and intermediate-level radioactive waste disposal site in Gyeong-Ju, Korea, Hydrogeology Journal, 20(7), 1341-1353.   DOI
5 Jo, Y., Chang, C., Park, K.W., Ji, S.H., Lee, C., 2017, In situ stress estimation in KURT site, Journal of the Geological Society of Korea, 53(5), 689-701 (in Korean with English abstract).   DOI
6 Lee, C., Yoon, S., Cho, W.J., Jo, Y., Lee, S., Jeon, S., Kim, G.Y., 2019, Study on thermal, hydraulic, and mechanical properties of KURT granite and Gyeongju bentonite, Journal of the Nuclear Fuel Cycle and Waste Technology, 17(S), 65-80 (in Korean with English abstract).   DOI
7 Lim, D.H., 2002, Mass transport analysis in the near field of geologic repository, Ph.D. Dissertation, Department of Nuclear Engineering, University of California, Berkeley, 13-20.
8 Min, K.B., Rutqvist, C.F., Tsang, C.F., Jing, L., 2004, Stress-dependent permeability of fractured rock masses: a numerical study, International Journal of Rock Mechanics and Mining Sciences, 41(7), 1191-1210.   DOI
9 Park, K.W., Kim, K.S., Koh, Y.K., Choi, J.W., 2011, Synthetic study on the geological and hydrogeological model around KURT, Journal of the Korean Radioactive Waste Society, 9(1), 13-21 (in Korean with English abstract).   DOI
10 Park, K.W., Ko, N.Y., Ji, S.H., 2019, Assesement of hydrogeological characteristics at BDZ-1 borehole in KAERI underground research tunnel, KAERI/TR-7750/2019, Daejeon, Korea.
11 Agheshlui, H., Sedaghat, M.H., Matthai, S., 2018, Stress influence on fracture aperture and permeability of fragmented rocks, Journal of Geophysical Research: Solid Earth, 123(5), 3578-3592.   DOI
12 Baghbanan, A., Jing, L., 2008, Stress effects on permeability in a fractured rock mass with correlated fracture length and aperture, International Journal of Rock Mechanics and Mining Sciences, 45(8), 1320-1334.   DOI
13 Barton, N., Choubey, V., 1977, The shear strength of rock joints in theory and practice, Rock Mechanics and Rock Engineering, 10(1-2), 1-54.   DOI
14 Chang, K.M., Lee, E.Y., Kim, C.L., Rhee, C.G., Kim, H.J., 2000, Estimation of conductivity tensor of fractured rocks from single-hole packer test, The Journal of Engineering Geology, 10(1), 13-25 (in Korean with English abstract).
15 Park, K.W., Ko, N.Y., Ji, S.H., 2020b, A study on the applicability of the hydraulic test method performed at an underground research facility in crystalline rock, Economic and Environmental Geology, 53(2), 121-131 (in Korean with English abstract)   DOI
16 Synn, J.H., Park, C., Lee, B.J., 2013, Regional distribution pattern and geo-historical transition of in-situ stress fields in the Korean peninsula, Tunnel and Underground Space, 23(6), 457-469 (in Korean with English abstract).   DOI
17 Park, K.W., Park, B.H., Ko, N.Y., Ji, S.H., 2020a, Applicability of pulse tests to estimate transmissivity in crystalline rock, The Journal of Engineering Geology, 30(3), 223-235 (in Korean with English abstract).   DOI
18 Park, S., Kim, K.I., Kwon, S., Yoo, H., Xie, L., Min, K.B., Kim, K.Y., 2018, Development of a hydraulic stimulation simulator toolbox for enhanced geothermal system design, Renewable Energy, 118, 879-895.   DOI