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Geomechanics and Engineering
  Volume 18, Number 6, August30 2019 , pages 575-584

Effect of groundwater fluctuation on load carrying performance of shallow foundation
Donggyu Park, Incheol Kim, Garam Kim and Junhwan Lee

    The groundwater level (GWL) is an important subsoil condition for the design of foundation. GWL tends to fluctuate often with seasonal variation, which may cause unexpected, additional settlements with some reductions in the safety margin of foundation. In this study, the effects of fluctuating GWL on the load carrying and settlement behavior of footing were investigated and quantified. A series of model load tests were conducted for various GWL and soil conditions using a hydraulically-controlled chamber system. Changes in load level and rising and falling GWL fluctuation cycle were considered in the tests. Settlements during GWL rise were greater than those during GWL fall. The depth of the GWL influence zone (dw,inf) varied in the range of 0.3 to 1.5 times footing width and became shallower as GWL continued to fluctuate. Design equations for estimating GWL-induced settlements for footings were proposed. The GWL fluctuation cycle, load level and soil density were considered in the proposed method. Changes in settlement and factor of safety with GWL fluctuation were discussed.
Key Words
    groundwater level; groundwater fluctuation; footings; settlement; factor of safety
Donggyu Park: Dongah Construction Industrial, 85, Gwangnaru-ro 56-gil, Gwangjin-gu, Seoul 05116, Republic of Korea, School of Civil and Environmental Engineering, Yonsei University, Seoul, Republic of Korea

Incheol Kim, Garam Kim and Junhwan Lee: School of Civil and Environmental Engineering, Yonsei University, 50, Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea

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