3D finite element analysis of pile responses to adjacent excavation in soft clay: Effects of different excavation depths systems relative to a floating pile

Soomro, Mukhtiar Ali; Mangnejo, Dildar Ali; Bhanbhro, Riaz; Memon, Noor Ahmed; Memon, Mahmood

doi:10.1016/j.tust.2019.01.012

Cited by 39 publications

(28 citation statements)

References 28 publications

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“…Owing to the excavation, the en-bearing resistance increased to 42% and 57% in case of S and T, respectively. In contrast to changes in axial load distribution in floating piles due to excavation reported by Soomro et al [26], the load distribution along the end-bearing piles altered significantly in each case. The axial load increased along the entire pile length.…”

Section: Load Transfer Mechanism Along the Pile Due To Excavationcontrasting

confidence: 77%

“…Comparing the induced bending moments of floating reported by Soomro et al [26] and end-bearing piles in case of S, negative bending moment was induced along the entire pile length of both types of piles in case T. Moreover, the bending moment reduces as excavation became deeper in case of T (i.e. formation level He = 18 m).…”

Section: Induced Lateral Displacement In the Pile Due To Excavationmentioning

confidence: 68%

“…The horizontal component of soil displacement vectors towards excavation in case S is slightly higher than that of case T. The maximum deflection induced at the pile head is approximately 15 mm (2.0% dp) in both cases. In contrast to end-bearing pile, Soomro et al [26] reported that the pile toe of the friction pile deflected towards the excavation side and the pile head displaced away from the excavation in both the cases. Furthermore the excavation-induced deflection profile reveals that the pile has rotated counter-clockwise about an axis perpendicular to the plane of the figure.…”

Section: Constitutive Model and Model Numerical Modelling Proceduresmentioning

confidence: 95%

“…Zhang et al [27] carried out the finite element analyses considering soil of the hardening small strain (HSS) constitutive model to establish the excavation-induced pile behaviors by varying the depth of excavation, pile diameter, pile length, pile distance away from the excavation, pilehead fixity, unsupported depth of excavation and axial loadings exerted on the pile head. Soomro et al [26] conducted parametric study to investigate the responses of floating pile to adjacent excavation at different depths. They concluded that the pile responses to excavation depend upon formation level of the excavation as well as the embedded depth of the wall.…”

Section: Introductionmentioning

confidence: 99%

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The Responses of an End-Bearing Pile to Adjacent Multipropped Excavation: 3D Numerical Modelling

2019

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It is well recognised that superstructure load is transferred to surrounding soil through piled foundation. Consequently, the high stress regime (stress bulb) is generated surrounding of the pile. On the other hand, the excavation in the ground inevitably results in the ground movement due to induced-stress release. These excavations are sometimes inevitable to be constructed adjacent to existing piled foundations. This condition leads to a big challenge for engineers to assess and protect the integrity of piled foundation. This research presents three-dimensional coupled consolidation analyses (using clay hypoplastic constitutive model which takes account of small-strain stiffness) to investigate the responses of an end-bearing pile due to adjacent excavation at different depths in soft clay. The effects of excavation depths (i.e., formation level) relative to pile were investigated by simulating the excavation near the pile shaft (i.e., case S) and next to (case T). It was revealed that the maximum induced bending moment in the pile after completion of excavation in all the cases is much less than the pile bending moment capacity (i.e. 800 kNm). Comparing the induced deflection of the end-bearing pile in the case T, the pile deflection in case S is higher. Moreover the piles in cases of S and T were subjected to significant dragload due to negative skin friction.

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Section: Load Transfer Mechanism Along the Pile Due To Excavationcontrasting

confidence: 77%

Section: Induced Lateral Displacement In the Pile Due To Excavationmentioning

confidence: 68%

Section: Constitutive Model and Model Numerical Modelling Proceduresmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The Responses of an End-Bearing Pile to Adjacent Multipropped Excavation: 3D Numerical Modelling

2019

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“…Given that the bearing capacity of piles after excavation fails to be practically measured in field, it is of great importance to conduct theoretical and numerical analysis to estimate its bearing capacity after excavation and the detrimental effects of excavation-induced soil movement on adjacent existing pile foundation, particularly during the engineering design stage. e influence of excavation on an adjacent single pile in different types of formation (e.g., soft clay and sand) has been investigated by several researchers [6][7][8][9][10]. ese studies generally show that bending moment and deflection occur, and pile head boundary condition and embedded depth of the wall, as well as formation level of the excavation, play an important role in influencing the pile response due to an adjacent excavation.…”

Section: Introductionmentioning

confidence: 99%

Influence of Underpinning Pile Drilling Construction on the Bearing Behavior of Existing Loaded Foundation Piles: Case Study

Shan

Xia

et al. 2020

Advances in Civil Engineering

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The mechanism of drilling borehole and its influence on the bearing behavior of existing foundation piles are unclear, hindering the application of excavation techniques. This paper proposes a new excavation scheme for high-rise buildings in downtown and develops theoretical formulas to calculate the skin friction and end resistance of existing foundation piles affected by adjacent borehole drilling for installing underpinning piles. These underpinning piles are installed and connected with the existing pile by the head cap before excavation. In a case study, the parameter analysis was then performed to understand the effect of underpinning construction on the bearing behavior of existing foundation piles in terms of skin friction and end resistance. The results show that borehole diameter, depth of drilling borehole, distance between the existing foundation pile and drilling borehole, and number of boreholes have a negligible influence on the end resistance of existing foundation piles. The effect of drilling parameters on the skin friction of existing foundation pile, as well as the influence extent, varies for different parameters. The depth of drilling borehole and the number of boreholes have significant influence and thus should be considered in real engineering design while the borehole diameter and the pile-pile distance have a negligible effect. The proposed new excavation technique could be potentially adopted for real engineering design of underneath excavation projects for high-rise buildings in downtown.

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A Prediction Method Based on Elasticity and Soil-Structure Interaction for Deep-Excavation Induced Deformations of Pile Foundations

Zheng

Franza

Jimenez

2021

Challenges and Innovations in Geomechanics

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3D finite element analysis of pile responses to adjacent excavation in soft clay: Effects of different excavation depths systems relative to a floating pile

Cited by 39 publications

References 28 publications

The Responses of an End-Bearing Pile to Adjacent Multipropped Excavation: 3D Numerical Modelling

The Responses of an End-Bearing Pile to Adjacent Multipropped Excavation: 3D Numerical Modelling

Influence of Underpinning Pile Drilling Construction on the Bearing Behavior of Existing Loaded Foundation Piles: Case Study

A Prediction Method Based on Elasticity and Soil-Structure Interaction for Deep-Excavation Induced Deformations of Pile Foundations

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