Settlement and load transfer mechanism of a pile group adjacent to a deep excavation in soft clay

Shakeel, Muhammad; Ng, Charles Wang Wai

doi:10.1016/j.compgeo.2017.10.010

Cited by 65 publications

(22 citation statements)

References 32 publications

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“…However, parameters, such as pile length, diameter, and distance from the edge of the foundation pit, were not considered. Shakee et al [18] studied a 2 × 2 floating pile group located adjacent to a deep soft clay excavation. The influences of the excavation depth, pile length, pile group location (from excavation), supporting system's stiffness, soil state and permeability, and working load, were investigated using a finite element model.…”

Section: State Of the Artmentioning

confidence: 99%

Effect of Inclination Angle on the Response of Double-row Retaining Piles: Experimental and Numerical Investigation

Ye¹,

Wang²,

Huang

et al. 2020

Teh. vjesn.

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The excavation depth of foundation pits has been increasing along with the continuous development of underground space and high-rise buildings. As a result, traditional double-row vertical piles cannot meet the ground settlement and deflection requirements. This study proposed a double-row pile optimization method to extend the suitability of double-row retaining piles to greater excavation depth. The optimization model was established by adjusting the inclination angle of the front and rear piles. Physical scale model tests were performed to analyze the effect of the inclination angle on the pile head displacements and bending moments during excavations and step loadings using three schemes, namely, traditional double-row piles with vertical piles, double-row contiguous retaining piles with batter pile in the front row, and double-row contiguous retaining piles with batter pile in both rows. Numerical simulations were also conducted to verify the effectiveness of the inclination angle adjustment in optimizing the double-row piles. Results indicate that the increase in the displacement and bending moment of the double-row contiguous retaining batter piles is not evident during excavation and step loading when compared with those of the double-row vertical piles and the double-row contiguous retaining piles with batter pile in the front row. Thus, double-row contiguous retaining batter piles can be used in deep foundation pits. The tilt angle is also excessively small to reduce the lateral displacement of the foundation pit, and the optimal tilt angle is 8°-16°. Although the embedment depth can influence the deformation of the double-row contiguous retaining batter piles significantly, a critical embedment depth may be reached. The findings of this study can provide references for the optimization of double-row piles in foundation pits.

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Section: State Of the Artmentioning

confidence: 99%

Effect of Inclination Angle on the Response of Double-row Retaining Piles: Experimental and Numerical Investigation

Ye¹,

Wang²,

Huang

et al. 2020

Teh. vjesn.

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“…In past decades, the open-cut method [4] and the cut-and-cover method [5] are the most widely used ways of constructing a metro station. Shakeel and Charles [6] and Zheng et al [7] studied the influence of the open-cut method of metro station on adjacent bridge piles. ese studies have shown that the open-cut method of metro station could produce a significant effect on adjacent piles.…”

Section: Introductionmentioning

confidence: 99%

Study on the Applicability of an Improved Pile‐Beam‐Arch Method of Metro Station Construction in the Upper‐Soft and Lower‐Hard Stratum

Guo

Jiang

Wang

2021

Advances in Civil Engineering

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The main challenge for metro station construction is to ensure the construction schedule while minimizing the impact on the surrounding environment. Based on the characteristics of the upper-soft and lower-hard stratum in the Dalian city of China, a special structure with six pilot tunnels and three spans of the pile-beam-arch (PBA) method is proposed and applied to the construction of the Labor Park metro station. In this study, laboratory experiments, numerical simulation analysis, and field monitoring data are used to investigate the applicability of six pilot tunnels and three spans of the PBA method in the process of construction. In the process of numerical simulation, the ground surface settlement, arch vertical displacement, the horizontal displacement of rock mass on both sides of the station, and vertical stress of support structure are analyzed. The numerical simulation results are found to be in good agreement with field measurement. Furthermore, the results indicate that, in the construction of six pilot tunnels and three spans of the PBA method, pilot tunnel construction and arch construction have a great influence on the surface settlement. The part of the initial vertical support of the pilot tunnels is removed, which caused the change of the position of maximum vertical stress and the redistribution of vertical stress. Because of reinforcement by side piles on both sides of the station, the horizontal displacement of the rock mass was reduced by 44.76% compared with that without reinforcement. The six pilot tunnels and three spans of the PBA method can effectively control the surface settlement, arch vertical displacement, and horizontal displacement of the rock mass.

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“…The authors found that the mobilization of shaft resistance along the pile depth highly depends on the relative pile toe position with respect to the excavation level. The above-mentioned studies provide additional insight into the interaction between the excavation and adjacent buildings [19][20][21][22][23][24][25][26][27]. However, the earth pressure acting on the retaining structure adjacent to the CFRLP was not considered in the authors' work.…”

Section: Introductionmentioning

confidence: 99%

“…The authors found that the presence of front piles tends to significantly reduce excavation-induced movements. Shakeel et al [ 27 ] conducted a three-dimensional analysis to gain insight into the response of pile groups adjacent to deep excavation. The authors found that the mobilization of shaft resistance along the pile depth highly depends on the relative pile toe position with respect to the excavation level.…”

Section: Introductionmentioning

confidence: 99%

Study on the earth pressure of a foundation pit adjacent to a composite foundation with rigid-flexible and long-short piles

Guo

Jin

et al. 2021

PLoS ONE

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Model tests were performed to investigate the lateral earth pressure acting on the retaining structure adjacent to both natural ground (NG) and composite foundation (CFRLP), which were supported with rigid-flexible and long-short piles. Two testing procedures, namely, applying a load to the foundation and rotating the retaining structure along its toe, were considered. The results indicate that the additional lateral earth pressure acting on the retaining structure adjacent to the CFRLP is less than that of the NG in the depth of the reinforcement area strengthened by flexible piles. Compared with NG, the CFRLP yielded a smaller normalized height of application of the lateral earth pressure, suggesting that the CFRLP blocked the horizontal diffusion of the load and had a strong ability to transfer the surcharge load to the deep soil. When rotating the retaining structure, the lateral earth pressure acting on the upper part of the retaining structure experienced limited reduction once the displacement at the top of the retaining structure was greater than 8 mm, whereas the pressure acting on the lower part of the retaining structure continued to decrease with increasing displacement. In addition, a three-dimensional finite element model (FEM) was used to investigate the influence of the pile parameter and the wall-soil friction angle on the additional lateral earth pressure.

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Settlement and load transfer mechanism of a pile group adjacent to a deep excavation in soft clay

Cited by 65 publications

References 32 publications

Effect of Inclination Angle on the Response of Double-row Retaining Piles: Experimental and Numerical Investigation

Effect of Inclination Angle on the Response of Double-row Retaining Piles: Experimental and Numerical Investigation

Study on the Applicability of an Improved Pile‐Beam‐Arch Method of Metro Station Construction in the Upper‐Soft and Lower‐Hard Stratum

Study on the earth pressure of a foundation pit adjacent to a composite foundation with rigid-flexible and long-short piles

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