Effect of consolidation on responses of a single pile subjected to lateral soil movement

Wang, Lizhong; Chen, Kexing; Hong, Yi; Ng, Charles Wang Wai

doi:10.1139/cgj-2014-0157

Cited by 27 publications

(5 citation statements)

References 28 publications

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“…In this hypothesised study, the parameters for silty clay were adopted Mašín et al, [9]. All the model parameters for silty clay reported by Wang et al, [25] are summarised in Table 1. The coefficient of lateral earth pressure at rest, Ko is estimated by Mayne and Kulhawy's [24] equation Ko=(1-sinφ)(OCR) sinφ .…”

Section: Constitutive Modelmentioning

confidence: 99%

Investigation of piled behaviour due to an adjacent excavation: 3D numerical modelling

2021

IJETER

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Zameer Ahmed Channaret al.,InternationalJournal of Emerging Trends in Engineering Research, 9(6), June 2021, 683–689683ABSTRACTIn congested cities, excavations are unavoidably constructed adjacent to high rising building supported by piled raft foundations which reduces differential settlements in the buildings. Since the excavations inevitably induce soil movement and stress changes in the ground, it may cause differential settlements to nearby piled raft foundation. In this numerical study, a 3D coupled consolidation numerical analysis (using a hypoplastic model, which considers strain dependent and path-dependent soil stiffness) was conducted to investigate a (2×2) piled raft responses to an adjacent 25-m deep excavation in saturated clay. The computed results have revealedthat the rate of piled raft settlement increased significantly beyond excavation stage h/He=0.5. This is because of the degradation of stiffness of clay with strain due to excavation-induced stress release. Differential settlement (i.e. tilting) was induced in the piled raft due to non-uniform stress release.Owing to separation of the raft from the ground due excavation, some of the working load was transferred to the four piles. The maximum positive bending moment was 200 kNm at Z/Lp=0.67. However, no any bending moment was induced in both the piles at the toes.

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Section: Constitutive Modelmentioning

confidence: 99%

Investigation of piled behaviour due to an adjacent excavation: 3D numerical modelling

2021

IJETER

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“…In this hypothesised study, the parameters for silty clay were adopted Mašín et al, [21]. All the model parameters for silty clay reported by Wang et al, [24] are summarised in Table 1. The coefficient of lateral earth pressure at rest, Ko is estimated by Mayne and Kulhawy's [25] equation Ko=(1-sinφ)(OCR) sinφ .…”

Section: Constitutive Modelmentioning

confidence: 99%

3D Numerical Modeling of Pile embankment performance on Soft Soil

2021

IJETER

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Embankments are often required in many civil engineering construction projects involving infrastructure development to elevate the ground level. Due to the limitation of land availability for infrastructure projects in many countries, a large number of projects are now being carried out on soft ground. However, embankment construction over soft ground is a challenging task due to several undesirable characteristics associated with soft soils such as local instability, inadequate bearing capacity and large settlements, which can occur over a long period of time. These problems can generally result in expensive remedial measures and long construction delays. The conventional soft ground improvement methods based on consolidation such as vertical drains and preloading are not suitable when projects have to be completed within a short period of time or the ground improvement has to be carried out in contaminated ground. In such situations, reinforced pile-supported embankments are increasingly used as an alternative construction method due to the shorter construction time required compared to consolidation based methods and due to the higher reliability of the method when the subsoil properties cannot be relied upon. . This paper presents a comprehensive numerical study carried out using the finite element method in order to investigate the performance of reinforced pile supported embankment. A detailed parametric study is presented inthree-dimensional conditions incorporating the full geometry of embankment system. The influence of pile embedded length, pile diameter, elastic modulus of piles, height of the embankment, construction rate of the embankment were investigated on the performance of the selected embankment.

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“…This problem is considered to be caused by the inclination of the pile under the lateral pressure of the soil layer under an adjacent surcharge load 5 . Previous studies of this issue, have included the field measurements 2 , 6 – 9 , centrifuge tests 10 – 12 , and numerical analyses 13 – 18 . These studies revealed that the lateral offset on the pile was caused by the adjacent unilateral surcharge, which resulted in the deflection of the superstructure such as bridge girders and high-rise buildings 19 , 20 .…”

Section: Introductionmentioning

confidence: 99%

“…Jeong et al 22 presented an investigation on the short- and long-term passive loading on the piles using the two dimensional elastoplastic-consolidation coupled FE analyses with large strain mode, and the results showed that passive pile loading was primarily affected by the magnitude of the surcharge load and degree of consolidation. Wang et al 12 performed four centrifuge model tests and numerical analyses to study the response of single pile subjected to lateral soil movement, and the results showed that it was necessary to consider the effect of consolidation on the pile-soil interaction. Li et al 23 conducted a series of field tests to examine the behavior of piles in the foundation with deep soft soils subjected to adjacent surcharge load, and a 3D FE model was established to study the factors affecting the consolidation of the soft soil.…”

Section: Introductionmentioning

confidence: 99%

A numerical analysis of inclination and rectification of ramp-bridge piers adjacent to surcharge load in soft clay area

Shen

Mao

Ding

et al. 2023

Sci Rep

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The surrounding surcharge has an adverse impact on the service performance of buildings and bridges, and it can endanger their structural safety, especially in soft soil areas. As one case study, the inclination accident of an expressway ramp bridge and its rectification are investigated in this study. Through the three-dimensional (3D) finite element (FE) analysis of the overall structures composed of the bridge span, the pier, and the pile foundation, the whole process of the inclination by the adjacent dumped earth, partial recovery by the unloading, and the lateral pushing rectification of the bridge structure were simulated. The results show that the surcharge load leads to soil displacement near the bridge pile, and the pile-soil interaction leads to the pile deformation, which further causes the inclination of the pier, and the movement of the bridge span. The severity of the accident can be measured by the inclination of the piers and the opening widths of the bridge expansion joints. Due to the plastic deformation and drainage consolidation of the soft clay foundation under the surcharge load, the inclination of the piles and piers cannot be fully recovered after unloading. In order to capture these processes, the FE simulation was divided into three steps. First, the drainage consolidation of the soil foundation were identified by FE simulation and the field measurement of the recovery of the structure after unloading. Second, the effects of soil properties, the surcharge time and surcharge strength on the bridge inclination and the recovery capacity after unloading are discussed. Finally, the rectification of the bridge by lateral pushing was simulated, and the deformation and stress in the pier and pile were calculated to evaluate the safety of the structures. These analyses provided understanding towards the prevention of the bridge inclination under surcharge load, prediction of the recovery by the unloading, and the methods to reduce the residual deformation to meet the specifications.

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Effect of consolidation on responses of a single pile subjected to lateral soil movement

Cited by 27 publications

References 28 publications

Investigation of piled behaviour due to an adjacent excavation: 3D numerical modelling

Investigation of piled behaviour due to an adjacent excavation: 3D numerical modelling

3D Numerical Modeling of Pile embankment performance on Soft Soil

A numerical analysis of inclination and rectification of ramp-bridge piers adjacent to surcharge load in soft clay area

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