Case History of Installing Instrumented Jacked Open-Ended Piles

Liu, Junwei; Zhang, Zhongmiao; Yu, Feng; Xie, Zhiyong

doi:10.1061/(asce)gt.1943-5606.0000638

Cited by 52 publications

(15 citation statements)

References 2 publications

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“…The plug capacity is mainly mobilized from the friction along the inner pile wall, particularly along the lower part of the soil plug where soil arching is significant and a large lateral coefficient of earth pressure is achieved. This arching effect was well observed in field testing of a concrete pipe pile (Liu et al 2012), as schematically shown in Fig. 3 where the CPT profile at the site is also included.…”

Section: Plug Capacitysupporting

confidence: 64%

Base Capacity of Open-Ended Steel Pipe Piles in Sand

Yang²

2012

J. Geotech. Geoenviron. Eng.

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This paper presents a new method for estimating the base capacity of open-ended steel pipe piles in sand, a difficult problem involving great uncertainty in pile foundation design. The method, referred to as the Hong Kong University (HKU) method, is based on the cone penetration test (CPT), and takes into consideration the mechanisms of annulus and plug resistance mobilization. In this method the annulus resistance is properly linked to the ratio of the pile length to the diameter-a key factor reflecting the influence of pile embedment-whereas the plug resistance is related to the plug length ratio, which reflects the degree of soil plugging in a practical yet rational way. The cone tip resistance is averaged over a zone in the vicinity of the pile base by taking into account the failure mechanism of the piles in sand, the condition of pile embedment (i.e., full or partial embedment), and the effect of soil compressibility. The predictive performance of the new method is assessed against a number of well-documented field tests including two fully instrumented large-diameter offshore piles, and through comparisons with major CPT-based methods in current engineering practice. The assessment indicates that the HKU method has attractive capabilities and advantages that render it a promising option.

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Section: Plug Capacitysupporting

confidence: 64%

Base Capacity of Open-Ended Steel Pipe Piles in Sand

Yang²

2012

J. Geotech. Geoenviron. Eng.

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“…As the pile tip penetrated the soil and advanced down, the lateral stresses increase sharply as a result of large soil deformation. This phenomenon follows the illustration of F. Yu (2004) and Liu et al (2012) that a penetrating pile base resembles the expansion of a spherical cavity. In the close regions from the pile shaft, the lateral stresses increase sharply and reach peak values as the pile tip almost penetrate to the level of these locations, and then decreased as the pile tip penetrated deeper.…”

Section: Dem Simulations Programmesupporting

confidence: 83%

DEM analysis of pile installation effect: comparing a bored and a driven pile

2018

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This paper presents a two-dimensional Particle Flow Code (PFC2D) model of the Discrete Element Method (DEM) that is used to study the effects of pile installation in deep foundation. It is accepted widely that installation method affects pile behaviour, but there are still limited studies that compare and analyse the impacts systematically. In this paper, the DEM is used to explain the pile behaviour installed in granular soils. A rigid bored pile and a rigid driven pile of the same geometry were installed into an assembly of granular soil modelled under a high gravitation force. Behaviour of the driven pile during penetration compares well with published data, and the numerical data also provides further insights of the soil-pile interaction during the penetration process. After pile installation, comparisons of the subsequent pile-loading behaviour were made, showing different contributions of shaft and end bearing resistance between the bored pile and the driven pile. Furthermore, the impacts of having different pile weights and different soil friction angles were discussed. When considering the same pile and soil friction, the driven pile performed better in the pile load test because the soil was compressed during the driving process. In particular, it was found that the soil friction affects the bored pile and the driven pile in a different manner such that soil friction will take effect after certain depth for bored pile, however, it will have an impact at the beginning for driven pile. Micro-scale sliding fraction of the particles near the two piles was also used to

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“…where f si is the unit internal friction of the open-ended pile; K s is the lateral pressure coefficient of the soil plug; σ vs is the effective vertical stress at various height t, as shown in Figure 1c; δ i is the friction angle between the soil plug and the inner side of the pile annulus. There is already research showing that the shearing failure plane of the inner side of the annulus occurs inside soil [30]. Hence, if the change in density of the compacted soil plug is neglected, the value of δ i can be approximated by the friction angle of the soil outside pile.…”

Section: Load Transfer Model Inside the Pile Annulusmentioning

confidence: 99%

Load Transfer of Offshore Open-Ended Pipe Piles Considering the Effect of Soil Plugging

Liu

Guo

Han

2019

JMSE

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Open-ended pipe piles have been increasingly used as the foundations for offshore structures. Considering the soil plugging effect, a novel analytical model is proposed in this paper to study the load transfer mechanism of open-ended pipe piles. A trilinear model for the external shaft friction was introduced, while a rigid plastic model was adopted to describe the load transfer at the pile-plug interface. Furthermore, an equilibrium equation of the soil plug was proposed, based on the hypothesis of a trilinear distribution of lateral earth pressure. The pile end resistance was analyzed by dividing it into two parts, i.e., the soil plug and pile annulus, the behaviors of which were described by the double broken line model. A calculation example was carried out to analyze the load transfer properties of the open-ended pipe piles. As a validation, similar load transfer processes of the open-ended pile were also captured in a newly built discrete element method model, mimicking the 100g centrifuge testing conditions.

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Case History of Installing Instrumented Jacked Open-Ended Piles

Cited by 52 publications

References 2 publications

Base Capacity of Open-Ended Steel Pipe Piles in Sand

Base Capacity of Open-Ended Steel Pipe Piles in Sand

DEM analysis of pile installation effect: comparing a bored and a driven pile

Load Transfer of Offshore Open-Ended Pipe Piles Considering the Effect of Soil Plugging

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