Interpretative Analysis of Lateral Load–Carrying Behavior and Design Model for Inclined Single and Group Micropiles

Kyung, Doohyun; Lee, Jun-Hwan

doi:10.1061/(asce)gt.1943-5606.0001810

Cited by 31 publications

(20 citation statements)

References 12 publications

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“…A negative effect, in which bearing capacity of a pile group was less than the summation of that of a single pile, on the bearing capacity of pile group was reported. On the other hand, a positive effect, in which the bearing capacity of pile group would be greater than the summation of a single-pile capacity, was also reported by Doohyun and Junhwan [9]. …”

Section: Introductionsupporting

confidence: 52%

The Use of Tactile Sensors and PIV Analysis for Understanding the Bearing Mechanism of Pile Groups

You

Chen

2018

Sensors

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Model tests were carried out in dry silica sand under pile loading and visualizing observation to investigate the behavior of a pile group. The pile group consisted of nine cylindrical model piles of 40 mm in diameter in most tests or three rectangular parallelepiped model piles in the visualizing observation. Pile spacings of 200 mm and 100 mm between pile centers were used in the models. Tactile sensors were installed to measure the pressure distribution in the ground and colored sand layer with particle image velocimetry (PIV) analysis to reveal the ground deformation in addition to strain gauges inside the model piles to investigate the interaction among group piles. The tests results showed that a narrower spacing between piles resulted in a wider affected area of the ground and the interaction was more significant below the tips.

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Section: Introductionsupporting

confidence: 52%

The Use of Tactile Sensors and PIV Analysis for Understanding the Bearing Mechanism of Pile Groups

You

Chen

2018

Sensors

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“…To scale the stress level, it is common practice to reduce the density of the soil, as sand dilates more at low-stress levels in the model, compared to in the prototype [4,16,49]. However, this has not been done for small-scale micropiles [48], likely due to the comparatively shallow embedment depth of the footings. Since the length of the prototype minipile is only 1.6 m in this study, to simulate very dense field conditions, the relative density of the model sand is reduced to only 90%.…”

Section: Model Minipiles and Scaling Effectmentioning

confidence: 99%

“…The design guidelines for micropiles are often used for projecting the practical performance of minipiles, due to the similar characteristics of the two. There is extensive literature on static lateral [45,48] and static and cyclic compressive and pull-out behaviour of micropiles [17,29,59,57]. However, there is only limited literature on the behaviour of micropiles under cyclic lateral loading.…”

Section: Introductionmentioning

confidence: 99%

“…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%

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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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“…Kazık grupları için, aynı grup içinde düşey ve farklı yerleşim açılarında negatif ve pozitif eğimli kazıkların olduğu bir kombinasyonun kullanılması, nihai yanal taşıma kapasitesinde önemli bir artışa neden olmuştur. Kyung ve Lee (2018) [11] tarafından yapılan çalışmada, mikro kazıkların yanal yük taşıma kapasiteleri, sonlu elemanlar yöntemine göre mikro kazık yerleşim açısına bağlı olarak elde edilmiştir. Tekil ve grup mikro kazıklar, farklı yerleşim açılarında, yükleme doğrultularında ve mikro kazıklar arası mesafelerde model deney çalışmaları ile araştırılmıştır.…”

Section: Introductionunclassified

Yanal Yüklü Eğik Rijit Kazıkların Sayısal Analizi

Misir

Laman²

2019

Teknik Dergi

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Yanal yük etkisindeki kısa kazık çekme kapasitesi, kazığın homojen/tabakalı kum zeminler içerisine, düşey/eğik olarak yerleştirilmesi durumlarında, laboratuvar model deneyleri ve sayısal analizler ile araştırılmıştır. Öncelikle problem 3 boyutlu olarak analiz edilmiş, ardından sistemin 2 boyuta indirgenebilir olup olmadığı araştırılmıştır. Bu amaçla, yanal yük etkisindeki rijit kazık problemi, şerit yük altındaki rijit bir duvar problemine dönüştürülmüştür. Problemin boyut değiştirmesi ile deney sonuçları ve 2 boyutlu sayısal analiz sonuçları arasında oluşan mertebe farkı, sabit katsayılar kullanılarak aşılmıştır. Geoteknik mühendisliği alanında ilk defa kullanılan 3 boyutlu bir problemin 2 boyuta indirgenmesi yaklaşımı ile, kabul edilebilir doğrulukta sonuçlar elde edilmiştir.

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Interpretative Analysis of Lateral Load–Carrying Behavior and Design Model for Inclined Single and Group Micropiles

Cited by 31 publications

References 12 publications

The Use of Tactile Sensors and PIV Analysis for Understanding the Bearing Mechanism of Pile Groups

The Use of Tactile Sensors and PIV Analysis for Understanding the Bearing Mechanism of Pile Groups

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

Yanal Yüklü Eğik Rijit Kazıkların Sayısal Analizi

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