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Geomechanics and Engineering Volume 33, Number 2, April25 2023 , pages 195-202 DOI: https://doi.org/10.12989/gae.2023.33.2.195 |
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Numerical study on stability and deformation of retaining wall according to groundwater drawdown |
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Hyunsung Lim, Jongjeon Park, Jaehong Kim and Junyoung Ko
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| Abstract | ||
| In this study, the ground settlement in backside of retaining wall and the behavior of the retaining wall were analyzed according to the method of groundwater drawdown due to excavation by using two-dimensional(2D) finite element analysis. Numerical analysis was performed by applying 1) fixed groundwater level, 2) constant groundwater drawdown, and 3) transient groundwater drawdown. In addition, the behavior of the retaining wall according to the initial groundwater level, ground conditions, and surcharge pressure in backside of retaining wall was evaluated. Based on the numerical analysis results, it was confirmed that when the groundwater level is at 0.1H from the ground surface (H: Excavation soil height), the wall displacement and ground settlement are not affected by the method of groundwater drawdown, regardless of soil conditions (dense or loose) and surcharge pressure. On the other hand, when the groundwater level is at 0.5H from the ground surface, the method of groundwater drawdown was found to have a significant effect on wall displacement and ground settlement. In this case, the difference in ground settlement presents by up to 4 times depending on the method of groundwater drawdown, and the surcharge load could increase the ground settlement by up to 1.5 times. | ||
| Key Words | ||
| adjacent ground settlement; excavation; finite element method; groundwater drawdown; retaining wall | ||
| Address | ||
| Hyunsung Lim: Department of Wind Power Business, Hanwha Corporation/E&C, 86, Cheonggyecheon-ro, Jung-gu, Seoul, 04541, Republic of Korea ongjeon Par: Department of Civil Engineering, Yonsei University, 50, Yonsei-ro, Seodaemun-gu, Seoul, 03722, Republic of Korea Jaehong Kim: Department of Civil Engineering, Dongshin University, 67, Dongshindae-gil, Naju-si, 58245, Republic of Korea Junyoung Ko: Department of Civil Engineering, Chungnam National University, 99, Daehak-ro, Yuseong-gu, Daejeon, 34134, Republic of Korea | ||