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Volume 7 Issue 2
Jun.  2019
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Article Contents
LI Wen-yon, FU Li, ZHU Zheng-feng. 2019: Numerical simulation and land subsidence control for deep foundation pit dewatering of Longyang Road Station on Shanghai Metro Line 18. Journal of Groundwater Science and Engineering, 7(2): 133-144.
Citation: LI Wen-yon, FU Li, ZHU Zheng-feng. 2019: Numerical simulation and land subsidence control for deep foundation pit dewatering of Longyang Road Station on Shanghai Metro Line 18. Journal of Groundwater Science and Engineering, 7(2): 133-144.

Numerical simulation and land subsidence control for deep foundation pit dewatering of Longyang Road Station on Shanghai Metro Line 18

  • Publish Date: 2019-06-28
  • In terms of controlling groundwater in deep foundation pit projects, the usual methods include increasing the curtain depth, reducing the amount of pumped groundwater, and implementing integrated control, in order to reduce the drawdown and land subsidence outside pits. In dewatering design for confined water, factors including drawdown requirements, the thickness of aquifers, the depth of dewatering wells and the depth of cutoff curtains have to be considered comprehensively and numerical simulations are generally conducted for calculation and analysis. Longyang Road Station on Shanghai Metro Line 18 is taken as the case study subject in this paper, a groundwater seepage model is developed according to the on-site engineering geological conditions and hydrogeological conditions, the excavation depth of the foundation pit as well as the design depth of the enclosure, hydrogeological parameters are determined via the pumping test, and the foundation pit dewatering is simulated by means of the three-dimensional finite difference method, which produces numerical results that consistent with real monitoring data as to the groundwater table. Besides, the drawdown and the land subsidence both inside and outside the pit caused by foundation pit dewatering are calculated and analyzed for various curtain depths. This study reveals that the drawdown and the land subsidence change faster near the curtain with the increase in the curtain depth, and the gradient of drawdown and land subsidence changes dwindles beyond certain depths. In this project, the curtain depth of 47/49 m is adopted, and a drawdown-land subsidence verification test is completed given hanging curtains before the excavation. The result turns out that the real measurements basically match the calculation results from the numerical simulation, and by increasing the depth of curtains, the land subsidence resulting from dewatering is effectively controlled.
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  • ZHOU Nian-qing, TANG Yi-qun, et al. 2011. Numerical simulation of deep foundation pit dewatering and land subsidence control of Xujiahui Metro Station. Chinese Journal of Geotechnical Engineering, 33(12):1950-1956.
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    LUO Zu-jiang, LIU Jin-bao, LI Lang. 2008. Three-dimensional full coupling numerical simu?lation of groundwater dewatering and land-subsidence in quaternary loose sedi?ments. Chinese Journal of Geotechnical Engineering, 30(02):193-198.
    FENG Hu, GAO Dan-ying, et al. 2013. Research on centrifuge model clay ultra-deep exca-vation instability and failure. Journal of Zhengzhou University (Engineering Science), 34(05):1-6.
    FENG Xiao-la, CAI Jiao-jiao, et al. 2016. Re-search on well group pumping test for foundation pit with drop waterproof curtains. Hydrogeology and Engineering Geology, 43(06):107-112.
    HUANG Ying-chao, XU Yang-qing. 2014. Nu-meri?cal simulation analysis of dewatering and recharge process of deep foundation pits. Chinese Journal of Geotechnical Engineering, 36(S2):299-303.
    DING Zhou-xiang, GONG Xiao-nan, et al. 2005. Finite element analysis of environmental effects of waterproof wall on foundation pit. Rock and Soil Mechanics, 26(S1):146-150.
    MA Chang-hui, MAO Yun, et al. 2014. Effects of dewatering methods on seepage and deformation of foundation pits. Chinese Journal of Geotechnical Engineering, 36(S2): 294-298.
    LOU Rong-xiang, ZHOU Nian-qing, ZHAO Shan. 2011. Numerical simulation of deep foun-dation pit dewatering of Xujiahui Station of Shanghai Metro Line No. 11. Chinese Journal of Underground Space and Engineering, 7(05): 908-913.
    ZHANG Fei, LI Jing-pei, et al. 2016. A study on the Anti-Upheaval Mode Test in the narrow and deep foundation pit in soft soil. Rock and Soil Mechanics, 37(10):2825-2832.
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    WANG Kang-da, TONG Li-yuan, et al. 2014. Optimization of dewatering wells in deep foundation pit considering effect of retaining structure. Chinese Journal of Geotechnical Engineering, 36(S2):259-264.
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