Dewatering of a 32.55 m Deep Foundation Pit in MAMA Under Leakage Risk Conditions

Wang, Jianxiu; Liu, Xiaotian; Liu, Jiaxing; Wu, Linbo; Guo, Qingfeng; Yang, Qing

doi:10.1007/s12205-017-1950-6

Cited by 23 publications

(3 citation statements)

References 30 publications

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“…Mechanism of Seepage Analysis. Formula (2) [4,9] is the governing equation of three-dimensional transient flow in anisotropic porous media. It is also the constitutive model used in this paper.…”

Section: Numerical Simulationmentioning

confidence: 99%

“…The construction of excavation pits below the groundwater table needs to lower the water table below the excavation face, so the dewatering scheme is vital. Effective dewatering measures are aimed at preventing uplift and fail of the base, avoiding quicksand and piping, and improving the stability and keeping the excavation face dry [4]. However, the dewatering work will lead to ground settlement inevitably.…”

Section: Introductionmentioning

confidence: 99%

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Investigation on Dewatering of a Deep Shaft in Strong Permeable Sandy Pebble Strata on the Bank of the Yellow River

et al. 2021

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This paper reports the dewatering scheme of a deep excavation in sandy pebble strata. The excavation is in high permeability strata and is close to the Yellow River, making the dewatering difficult during construction. At present, few researchers have specially studied the dewatering scheme of deep excavations in strong permeable strata near the water resource. Field pumping test was conducted before the excavation activity, and the permeability coefficient of the strata was obtained by reverse analysis. According to the characteristics of the project, the dewatering scheme of “ waterproof curtain + base grouting + pumping ” was proposed. The influence of vertical waterproof curtain and base grouting on dewatering was analyzed by numerical simulation. In the construction process, the field water table and ground settlement were measured. The results show that (1) the groundwater table versus permeability coefficient curve shows three different stages and (2) the dewatering scheme of “ waterproof curtain + base grouting + pumping ” is effective for deep excavation in strong permeable strata.

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Section: Numerical Simulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigation on Dewatering of a Deep Shaft in Strong Permeable Sandy Pebble Strata on the Bank of the Yellow River

et al. 2021

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“…Structure. Because of the thixotropic nature and flow deformation of soft soil, the stability of the supporting structure and the surrounding buildings must be ensured during excavation and deformation must be controlled within a reasonable range [19,20]. e construction of the supporting structure is layered, and the structure was constructed during the excavation of the foundation pit.…”

Section: Design Of the Supportingmentioning

confidence: 99%

Design of the Supporting Structures for Large and Unusually Shaped Foundation Pit near the Yangtze River

Guo

Yan

et al. 2020

Advances in Civil Engineering

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A large underground transportation hub is located on the west side of the Nanjing Youth Olympic Center, which is close to the embankment of the Yangtze River. The near-surface primarily comprises newly deposited soft soil of considerable thickness; the lower part is a riverbed-phase sandy soil containing two confined aquifers. The foundation pit requires deep excavation and has unusual shapes of “pit in pit” and “pit leaning pit.” For the convenience and safety of excavation, the piezometric head of the upper confined aquifer, where the pit bottom is located, reached 1 m below the bottom plane through precipitation, while that of the lower confined aquifer also dewatered down to a safe water level to avoid an uplift problem. After considering the engineering geological conditions, the function and shape of the foundation pits, we divided the soil layers of the foundation pits into two areas (the NW area and the SE area) and proposed the support scheme correspondingly. The numerical simulation results and completed construction safely verified the feasibility of the support scheme.

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Risk assessment of seepage failure in deep excavations based on fuzzy analytic hierarchy process and cloud model

Zhou

2023

Acta Geotech.

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Dewatering of a 32.55 m Deep Foundation Pit in MAMA Under Leakage Risk Conditions

Cited by 23 publications

References 30 publications

Investigation on Dewatering of a Deep Shaft in Strong Permeable Sandy Pebble Strata on the Bank of the Yellow River

Investigation on Dewatering of a Deep Shaft in Strong Permeable Sandy Pebble Strata on the Bank of the Yellow River

Design of the Supporting Structures for Large and Unusually Shaped Foundation Pit near the Yangtze River

Risk assessment of seepage failure in deep excavations based on fuzzy analytic hierarchy process and cloud model

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