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Geomechanics and Engineering Volume 28, Number 5, March10 2022 , pages 437-454 DOI: https://doi.org/10.12989/gae.2022.28.5.437 |
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Geomechanical and hydrogeological validation of hydro-mechanical two-way sequential coupling in TOUGH2-FLAC3D linking algorithm with insights into the Mandel, Noordbergum, and Rhade effects |
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Sungho Lee, Jai-Yong Park, Jung-Hwi Kihm and Jun-Mo Kim
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| Abstract | ||
| The hydro-mechanical (HM) two-way sequential coupling in the TOUGH2-FLAC3D linking algorithm is validated completely and successfully in both M to H and H to M directions, which are initiated by mechanical surface loading for geomechanical validation and hydrological groundwater pumping for hydrogeological validation, respectively. For such complete and successful validation, a TOUGH2-FLAC3D linked numerical model is developed first by adopting the TOUGH2-FLAC3D linking algorithm, which uses the two-way (fixed-stress split) sequential coupling scheme and the implicit backward time stepping method. Two geomechanical and two hydrogeological validation problems are then simulated using the linked numerical model together with basic validation strategies and prerequisites. The second geomechanical and second hydrogeological validation problems are also associated with the Mandel effect and the Noordbergum and Rhade effects, respectively, which are three phenomenally well-known but numerically challenging HM effects. Finally, sequentially coupled numerical solutions are compared with either analytical solutions (verification) or fully coupled numerical solutions (benchmarking). In all the four validation problems, they show almost perfect to extremely or very good agreement. In addition, the second geomechanical validation problem clearly displays the Mandel effect and suggests a proper or minimum geometrical ratio of the height to the width for the rectangular domain to maximize agreement between the numerical and analytical solutions. In the meantime, the second hydrogeological validation problem clearly displays the Noordbergum and Rhade effects and implies that the HM two-way sequential coupling scheme used in the linked numerical model is as rigorous as the HM two-way full coupling scheme used in a fully coupled numerical model. | ||
| Key Words | ||
| geomechanical validation; hydrogeological validation; hydro-mechanical two-way sequential coupling; Mandel effect; Noordbergum effect; Rhade effect; TOUGH2-FLAC3D linking algorithm | ||
| Address | ||
| Sungho Lee: School of Earth and Environmental Sciences, Seoul National University, Seoul 08826, Republic of Korea Jai-Yong Park: Geology Division, Korea Institute of Geoscience and Mineral Resources, Daejeon 34132, Republic of Korea Jung-Hwi Kihm :Department of Fire and Disaster Prevention, Jungwon University, Goesan-Gun 28024, Republic of Korea Jun-Mo Kim: School of Earth and Environmental Sciences, Seoul National University, Seoul 08826, Republic of Korea; GeoLab, Seoul 08787, Republic of Korea | ||