Inclined single piles under vertical loadings in cohesionless soil

Goit, Chandra Shekhar; Saitoh, Masato; Igarashi, Takumi; Sasaki, Shun

doi:10.1007/s11440-020-01074-9

Cited by 9 publications

(3 citation statements)

References 29 publications

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“…2). This new type of composite foundation effectively utilizes the strong lateral reinforcement effect of inclined piles [45,46,47,48,49] and double-row piles [50,51,52,53,54]. However, there have been few reports on the practical application of this new treatment scheme in actual engineering, and the relevant theoretical research is relatively insufficient, which limits the practical application of this new reinforcement method.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on the engineering characteristics of include-straight double-row piles at the edge of the embankment

Feng,

Zhou

et al. 2024

Preprint

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When using pile composite foundation reinforcement for embankments in soft foundation sections, the embankment is prone to differential settlement, sliding, and even collapse. Based on the failure characteristics of pile composite foundation, this article proposes a reinforcement scheme using 'inclined-straight double-row piles' at the toe of the embankment slope. Through model tests, the deformation process, bending moment, and horizontal displacement of the pile body under lateral loading were compared for multiple sets of 'inclined-straight double-row piles'. Combined with numerical simulation analysis, the load-deformation characteristics and failure modes of the inclined-straight double-row piles under lateral loading were revealed, and a calculation analysis model was proposed to provide reference for the practical engineering application. The following conclusions were mainly drawn: (1) Under lateral loading, the inclined-straight double-row piles experience horizontal displacement, followed by bending deformation, with the inner piles failing first and the outer piles failing later, showing correlation. The failure load of the double straight piles falls between the inner and outer piles of the inclined-straight double-row piles. Increasing the bending stiffness of the inner piles and the inclination of the outer piles will significantly improve the overall stability. (2) When subjected to lateral loading, the inclined-straight double-row piles may experience overturning failure due to excessive lateral movement of the pile body or fracture failure due to excessive load on the pile body. (3) Calculation analysis models were developed for the overturning failure mode and pile body fracture failure mode.

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Section: Introductionmentioning

confidence: 99%

Experimental study on the engineering characteristics of include-straight double-row piles at the edge of the embankment

Feng,

Zhou

et al. 2024

Preprint

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“…Therefore, the study of the stress changes at the pile soil interface during the penetration of jacked piles has become the primary issue in the study of jacked pile technology, to study the problem of pile-soil interface (Ma et al 2022;Ding et al 2021;Yazdani et al 2019;Ding et al 2020;Yang et al 2022), first, we should understand the interaction between the structure and soil under the influence of external conditions (Ahn et al 2021;Li et al 2017;Tran et al 2022), mechanical properties between different soils and piles under different factors Soundara et al 2017;Song et al 2022;Ai et al 2021;Liu et al 2019;Peng et al 2014;Goit et al 2021;Jin et al 2022), and use numerical simulation for analysis (Li et al 2021;Bao et al 2022;Lee et al 2012).…”

Section: Introductionmentioning

confidence: 99%

Green environmental static pressed pile penetration mechanism based on FBG-MEMS joint test technology

Wang

et al. 2023

Preprint

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Green environmental static pressure pile technology has always been one of the problems that many scholars urgently need to study. For the stress test of pile-soil interface, this experiment designed the FBG-MEMS joint test technology between the pile-soil interface during the penetration of static pressure piles in cohesive soil. In this test, a model pile is set up in the model bucket. By studying what effects will happen to the pile-soil interface when the pile is in different positions in the bucket, and studying how the boundary effect affects the changes of the indoor test results, the loading device and monitoring system are used to test the pile pressing force, pile shaft axial force and pile-soil interface stress generated during the penetration of the model pile in the model box. The preliminary test verifies the characteristics of simple operation and high accuracy of the test, and also draws the conclusion that with the increase of the penetration depth, the axial force of the pile shaft and the effective lateral pressure of the pile-soil interface increase, but the lateral pressure at the same depth gradually decreases. In addition, the influence of boundary effect is further analyzed. Finally, it is concluded that the boundary effect will increase the pile driving force, pile shaft axial force and effective side friction. The research results have important reference significance for green environmental protection static pressure pile technology in practical engineering.

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“…The above literature only explores the effect of cyclic loading on piles installed vertically, while very limited studies have been dedicated to battered piles [12,35,48,75]. Field testing and application of driven battered pile groups have been reported by Abu-Farsakh et al [6], as a pier foundation for a twin span bridge built over a lake.…”

Section: Introductionmentioning

confidence: 99%

Battered minipile response to low-frequency cyclic lateral loading in very dense sand

Mondal

Disfani

2022

Acta Geotech.

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This experimental study investigates the response of vertical and battered minipiles to two-way symmetrical low-frequency (0.1 Hz) cyclic lateral loading. Laboratory (1-g) tests were performed on scaled-down minipiles in very dense cohesionless soil, for batter angles of 0°, 25° and 45°. The cyclic loading is classified into two categories: multi-amplitude and long-term single amplitude, where force-controlled load was applied at a constant frequency. The minipiles were instrumented with optic fibres, and strain profiles were obtained at each loading stage, in both compression and tension stroke. The results are presented in terms of hysteresis loops, variation of normalised stiffness, minipile strain and bending moments under cyclic loading. In the multi-amplitude loading category, backbone curves show a stiffer force–displacement response in tension stroke than in compression stroke. For the single-amplitude category, the area of the hysteresis loop is largest for 45° battered minipiles with the lowest accumulated deformation. The normalised stiffness at the end of 50 cycles is highest for 25° minipiles with a value slightly greater than one. The strain profiles along the minipiles show stabilisation of measured strain before the number of cycle reaches 50, for all three battered conditions. A multi-surface hardening constitutive model is used to explain the effect of shearing and cyclic loading, with increasing loading amplitude on 25° battered minipiles. These test results are indicative of better performance capability of 25° battered minipiles, in terms of secant stiffness, compared to the vertical and 45° battered cases.

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Inclined single piles under vertical loadings in cohesionless soil

Cited by 9 publications

References 29 publications

Experimental study on the engineering characteristics of include-straight double-row piles at the edge of the embankment

Experimental study on the engineering characteristics of include-straight double-row piles at the edge of the embankment

Green environmental static pressed pile penetration mechanism based on FBG-MEMS joint test technology

Battered minipile response to low-frequency cyclic lateral loading in very dense sand

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