Measuring horizontal stresses during jacked pile installation

d'Arezzo, Francesca Burali; Haigh, Stuart; Talesnick, Mark; Ishihara, Yoshio

doi:10.1680/geng.14.00069

Cited by 12 publications

(4 citation statements)

References 22 publications

(31 reference statements)

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“…From experiments in dry sand it is known that the stress below the pile tip increases significantly and grain crushing can occur (Yang et al, 2010). Once the pile tip passes the soil, a sharp reduction of effective (radial) stress acting on the pile shaft was observed in experiments (White and Lehane, 2004;Yang et al, 2010;Jardine et al, 2013a;Burali d'Arezzo et al, 2015). A schematic of the development of the radial stress in the soil close to the pile shaft is given in Fig.…”

Section: Installation-induced Changes In Stressmentioning

confidence: 99%

Long-Term Response of Piles to Cyclic Lateral Loading Following Vibratory and Impact Driving in Water-Saturated Sand

Staubach

Macháček

Bienen

et al. 2022

J. Geotech. Geoenviron. Eng.

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The influence of the pile installation by vibratory or impact driving on the response to subsequent cyclic lateral loading, as faced in the offshore environment, is investigated numerically. Largedeformation analyses of the pile installation process using the Coupled Eulerian-Lagrangian method considering partially drained conditions are performed. Following the installation, one million lateral load cycles are simulated using the high-cycle accumulation (HCA) model. The lower the hydraulic conductivity of the soil during driving, the higher the accumulation of lateral deformation when the pile is subjected to high-cyclic loading. The assumption of ideally drained conditions during pile driving results in a lower accumulation, in particular for the vibratory driven pile. Compared to the influence of the drainage conditions during driving, the influence of the installation method is found to be of less importance. While the vibratory driven piles tend to give less resistance to monotonic lateral loading for most conditions, slightly lower permanent pile head rotations after one million lateral loading cycles are observed compared to the impact driven piles.

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Section: Installation-induced Changes In Stressmentioning

confidence: 99%

Long-Term Response of Piles to Cyclic Lateral Loading Following Vibratory and Impact Driving in Water-Saturated Sand

Staubach

Macháček

Bienen

et al. 2022

J. Geotech. Geoenviron. Eng.

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“…Jacked pile experimental results [12] for sand show that with increasing h/R, the radial effective stress decreases, where h is the distance above the pile tip and R is the pile radius. During the jacked installation of a cylindrical pile in dry sand in a centrifuge, D'Arezzo et al [13] used null gauges to measure horizontal stress changes. Stress is measured using both an adjacent pre-installed square pile and in-sandy soil sensors.…”

Section: Effect On the Stress And Deformation Statementioning

confidence: 99%

“…Another study on the change in horizontal stress during pile driving were conducted by D'Arezzo et al [13]. Null-gauges were used to measure horizontal stress changes during the jacked installation of a cylindrical pile in dry sand.…”

Section: Effect On the Stress And Deformation Statementioning

confidence: 99%

Archives of Civil Engineering

Kabeta

2022

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Several field and model tests have been conducted to investigate the impact of pile installation on bearing capacity. However, little is known about how piles behave during installation, how they interact with the surrounding soil, and how this affects sandy soil properties. This review paper investigates the effect of pile driving on surrounding sandy soil as it compacts sandy soil near to the pile. For this purpose, various related literature was studied based on the observation of the pile installation effect on earth pressure or lateral stress, relative density, and pore water pressure in the sandy soil. A change in the deformation and stress state of surrounding sandy soil due to pile driving was presented. The installation of fully displacement piles can lead to significant stresses and deformations in the surrounding sandy soil. This is one of the main causes of uncertainty in the design and analysis of pile foundations. According to this study, the sandy soil around the pile is compacted during pile driving, resulting in lateral and upward displacement. This leads to the densification effect of pile driving on loose sandy soil. Sandy soil improvement with driven piles depends on pile shape, installation method, and pile driving sequences. This study concludes that in addition to its advantages of transferring superstructure load to deep strata, the increased relative density of loose sand, the change in the horizontal stress, and the influence of compaction on the sandy soil parameters during pile driving should be considered during pile design and analysis.

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“…The densification of the soil surrounding piles during the piles' installation, and the additional stress of the soil surrounding them, increased with depth [1]. Due to the crowding effect of jacking piles, the radial stress of the pile increases nonlinearly alongside the depth, and gradually converges to passive earth pressure [6]; the continuous disturbance of the soil around the pile during the jacking pile process leads to the "degradation phenomenon" of the radial stress of the pile, which is usually considered to be due to the "friction fatigue effect" at the pile-soil interface [7][8][9][10][11][12]. Meanwhile, there is a tendency for the loosening of shallow soil, and the densification of the deep soil surrounding the pile, during the piles' installation [13,14], which is due to pile rebound.…”

Section: Introductionmentioning

confidence: 99%

The Effects and Vertical Bearing Capacity of Two Jacked Model Piles in Sand

et al. 2022

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The effects and vertical bearing capacity of two jacked piles in sand are still not well understood, and the mechanism of the adjacent pile’s uplift caused by the jacking pile in a double pile system is especially unclear, but these facets are important to the stability of the jacked pile. In this paper, a series of tests is performed on jacked model piles in sand, where in the influences of the pile length and the driving pile’s speed on the effects and vertical bearing capacity of two jacked piles were studied. The results revealed that the effects and vertical bearing capacity of the two jacked piles were mainly in relation to pile length and influenced by the driving speed. The horizontal displacement of the top of the first jacking pile during the installation of the post-jacking pile was caused by the difference in the stress state of the first jacking pile between the side of the pile’s face and its back side, in which the uplift displacement of the first jacking pile was also involved. The radial stress of the pile increased nonlinearly with the depth under different pile lengths and gradually converged to the passive earth pressure. The ultimate capacity of the double pile is approximately twice that of a single pile, and the ratio of the ultimate capacity of a single pile to the final jacking pressure was approximately 1.04.

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Measuring horizontal stresses during jacked pile installation

Abstract: Measuring horizontal stresses during jacked pile installation Author 1

Cited by 12 publications

References 22 publications

Long-Term Response of Piles to Cyclic Lateral Loading Following Vibratory and Impact Driving in Water-Saturated Sand

Long-Term Response of Piles to Cyclic Lateral Loading Following Vibratory and Impact Driving in Water-Saturated Sand

Archives of Civil Engineering

The Effects and Vertical Bearing Capacity of Two Jacked Model Piles in Sand

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