A Case Study on Stratified Settlement and Rebound Characteristics due to Dewatering in Shanghai Subway Station

Wang, Jianxiu; Huang, Tianrong; Sui, Dongchang

doi:10.1155/2013/213070

Cited by 9 publications

(3 citation statements)

References 19 publications

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“…More and more attention has been paid to the development and utilization of underground spaces such as underground transportation hubs, commercial complexes, high-rise basements, and underground drainage tunnels. The corresponding excavation depth and scope of underground space projects have become increasingly greater, and the environmental conditions surrounding foundation pits are becoming more complex [1,2].…”

Section: Introductionmentioning

confidence: 99%

Research on Subsidence Induced by the Dewatering–Curtain Interaction in the Deep Foundation Pit of the Shield Launching Shaft in Shenzhen, China

Zhang

Chen

et al. 2023

Water

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The waterproof curtain plays an important role in the dewatering of a deep foundation pit. Recognition of the depth of the waterproof curtain inserted into the confined aquifer at different depths may help control ground subsidence due to dewatering, but subsidence analysis of the interaction between dewatering and the waterproof curtain requires further study. In this study, we mainly analyze the relationship between ground subsidence and dewatering based on the shield shaft pit of the Qianhai-Nanshan deep tunnel project in Shenzhen. Our numerical simulation results show that the ground subsidence around the foundation pit decreases with an increase in the depth of the waterproof curtain inserted into the confined aquifer, and when the waterproof curtain completely penetrates the confined aquifer, the ground subsidence caused by pit dewatering is minimal. Our numerical simulation results are consistent with the actual on-site dewatering monitoring data. Our results suggest that the diaphragm wall is an effective measure to control the ground subsidence in deep foundations, helping to reduce excessive dewatering.

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Section: Introductionmentioning

confidence: 99%

Research on Subsidence Induced by the Dewatering–Curtain Interaction in the Deep Foundation Pit of the Shield Launching Shaft in Shenzhen, China

Zhang

Chen

et al. 2023

Water

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“…Geotechnical centrifuge modeling is an advanced physical modeling technique that provides data for investigating mechanisms of deformation and failure and for validating analytical and numerical methods (Ng, 2014). Some authors have presented centrifuge tests that evaluate the influence of regional subsidence in a different type of constructions (Sun et al, 2008;Cui et al, 2010a;Cheng et al, 2011;Tang et al, 2012;Wang et al, 2013;Zhang et al, 2017a, b). On the other hand, various researches have been done using piled raft system on centrifuge like Thaher & Jessberger (1991), Horikoshi & Randolph (1996), Bajad & Sahu (2008), Goh & Zhang (2017), among others.…”

Section: Introductionmentioning

confidence: 99%

Validation of a 3D numerical model for piled raft systems founded in soft soils undergoing regional subsidence

Posse¹,

Rebolledo²,

Garcia³

et al. 2021

S&R

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In this paper a 3D numerical model using a software based on the Finite Element Method (FEM), was developed and validated using the results obtained in a geotechnical centrifuge model of a piled raft system founded in soft soils undergoing regional subsidence. The piled raft configuration had nine piles distributed in the center of the raft. The kaolin parameters were obtained, calibrated, and validated for the Hardening Soil Model (HSM), based on laboratory triaxial and oedometer test results. Also, a single pile load test was carried out in the centrifuge to get the resistance parameters used in the FEM. The developed numerical model reproduced satisfactorily soil and foundation consolidation displacements due, not only by the structural service load but also by the pore pressure drawdown. For load distribution on piles and raft, the model reproduces with good agreement the foundation behavior only for the structural service load, for pore pressure drawdown some adjustments on the embedded piles elements shaft and base resistance had to be done. The developed model allowed to identify the most sensitive parameters for this type of simulation, to define the types and stages of analysis that had the best fit for the physical model, and to obtain additional results to those measured in the physical model, e.g., the axial load distribution developed along the piles and therefore the magnitude of the negative skin friction, that is an important load that should be considered for the structural safety review of piled foundations subjected to this complex conditions.

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“…However, several researchers have adopted this measure in the projects with shallow groundwater level for controlling the water influx into the foundation pit [9][10][11][12]. The second measure of installing pumping wells has been widely used to lower the groundwater table in open pits [13][14][15], and this measure has often been used in conjunction with a diaphragm wall. Therefore, appropriate selection of relative depth of both diaphragm wall and wells plays an effective role in controlling the land subsidence outside the foundation pit.…”

Section: Introductionmentioning

confidence: 99%

Finite-Difference Numerical Simulation of Dewatering System in a Large Deep Foundation Pit at Taunsa Barrage, Pakistan

et al. 2019

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This study investigates a large deep foundation pit of a hydraulic structure rehabilitation program across the Indus river, in the Punjab province of Pakistan. The total area of the construction site was 195,040 m 2 . Two methods, constant head permeability test and Kozeny-Carman equation, were used to determine the hydraulic conductivity of riverbed strata, and numerical simulations using the three-dimensional finite-difference method were carried out. The simulations first used hydraulic conductivity parameters obtained by laboratory tests, which were revised during model calibration. Subsequently, the calibrated model was simulated by different aquifer hydraulic conductivity values to analyze its impact on the dewatering system. The hydraulic barrier function of an underground diaphragm wall was evaluated at five different depths: 0, 3, 6, 9, and 18 m below the riverbed level. The model results indicated that the aquifer drawdown decreases with the increase in depth of the underground diaphragm wall. An optimal design depth for the design of the dewatering system may be attained when it increases to 9 m below the riverbed level.

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A Case Study on Stratified Settlement and Rebound Characteristics due to Dewatering in Shanghai Subway Station

Cited by 9 publications

References 19 publications

Research on Subsidence Induced by the Dewatering–Curtain Interaction in the Deep Foundation Pit of the Shield Launching Shaft in Shenzhen, China

Research on Subsidence Induced by the Dewatering–Curtain Interaction in the Deep Foundation Pit of the Shield Launching Shaft in Shenzhen, China

Validation of a 3D numerical model for piled raft systems founded in soft soils undergoing regional subsidence

Finite-Difference Numerical Simulation of Dewatering System in a Large Deep Foundation Pit at Taunsa Barrage, Pakistan

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