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摘要:
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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篇名 Numerical simulation and land subsidence control for deep foundation pit dewatering of Longyang Road Station on Shanghai Metro Line 18
来源期刊 地下水科学与工程:英文版 学科 工学
关键词 Deep FOUNDATION PIT Engineering DEWATERING Numerical simulation GROUNDWATER Land SUBSIDENCE Verification test
年,卷(期) dxskxygcywb,(2) 所属期刊栏目
研究方向 页码范围 133-144
页数 12页 分类号 TV
字数 语种
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研究主题发展历程
节点文献
Deep
FOUNDATION
PIT
Engineering
DEWATERING
Numerical
simulation
GROUNDWATER
Land
SUBSIDENCE
Verification
test
研究起点
研究来源
研究分支
研究去脉
引文网络交叉学科
相关学者/机构
期刊影响力
地下水科学与工程:英文版
季刊
2305-7068
河北省石家庄市中华北大街268号
出版文献量(篇)
277
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0
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