Numerical study of single helical piles and helical pile groups under compressive loading in cohesive and cohesionless soils

Nowkandeh, Mohammadreza Jahanshahi; Choobbasti, Askar Janalizadeh

doi:10.1007/s10064-021-02158-w

Cited by 39 publications

(9 citation statements)

References 21 publications

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“…Furthermore, it was found that increasing the helix diameter will increase the compressive and tensile strengths of helical piles. Similar results were also derived from other researchers [6][7][8][9][10].…”

Section: Introductionsupporting

confidence: 92%

Experimental Modelling of Helical Piles Subjected to Axial Loading

Bilal,

Alam,

Sarir

et al. 2023

IJEET

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In the construction sector, axial loads have traditionally been supported by piles. There hasn't been sufficient comparative study related to the economics and viability aspects of conventional and helical piles up to this point in natural soil condition. The current study was conducted to test the behavior of helical piles subjected to axial loading and the results were compared with the conventional pile counterpart. For this, a total of eighteen experiments were performed with varying number of helical piles either single or multi helical piles in a raft. Helical piles were penetrated into ground, vertical load of 512 kg was applied and the settlements were recorded with the gauges installed. The reduction in settlement was found to increase due to increasing the number of piles, inter distance between the piles and increasing the number of helices. Nine double helical piles were observed to reduce settlement by 80.5% when compared to nine conventional piles. Due to the smaller number of piles needed to support the applied axial load when employing helical piles as opposed to conventional piles, the cost was greatly lowered.

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Section: Introductionsupporting

confidence: 92%

Experimental Modelling of Helical Piles Subjected to Axial Loading

Bilal,

Alam,

Sarir

et al. 2023

IJEET

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“…Numerical and experimental studies have demonstrated the behavior of helical [43][44][45][46][47][48][49][50] and granular anchor piles [25,32,[51][52][53][54]. However, studies have not examined their anchoring capabilities in expansive soil [55].…”

Section: Application Helical Piles Granular Anchor Pilesmentioning

confidence: 99%

A State-of-the-Art Review and Numerical Study of Reinforced Expansive Soil with Granular Anchor Piles and Helical Piles

2023

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Expansive soils exist in many countries worldwide, and their characteristics make them exceedingly difficult to engineer. Due to its significant swelling and shrinkage characteristics, expansive soil defies many of the stabilization solutions available to engineers. Differential heave or settlement occurs when expansive soil swells or shrinks, causing severe damage to foundations, buildings, roadways, and retaining structures. In such soils, it is necessary to construct a foundation that avoids the adverse effects of settlement. As a result, building the structure’s foundations on expansive soil necessitates special consideration. Helical piles provide resistance to uplift in light structures. However, they may not fully stabilize foundations in expansive soils. A granular anchor pile is another anchor technique that may provide the necessary resistance to uplift in expansive soils using simpler methods. This review and numerical study investigate the fundamental foundation treatments for expansive soils and the behavior of granular anchors and helical piles. Results indicate that granular anchor piles performed better than helical piles for uplift and settlement performance. For heave performance, the granular anchor and helical piles perform nearly identically. Both achieve heave reductions greater than 90% when L/H > 1.5 and D = 0.6 m.

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“…The capacity of the Plaxis 3D software to accurately simulate the compressive behavior of helical piles in clayey soil (Site B) was assessed in this study. The verification process involved referencing the experiments conducted in previous studies [66,67].…”

Section: Compressive Behaviormentioning

confidence: 99%

Comparative Analysis of Helical Piles and Granular Anchor Piles for Foundation Stabilization in Expansive Soil: A 3D Numerical Study

2023

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This study investigates the performance of granular anchor piles and helical piles in expansive soils. Expansive soils pose challenges for engineering due to their significant swelling and shrinkage characteristics. Special considerations are required for constructing foundations on expansive soil to mitigate volumetric changes. While helical piles provide uplift resistance in light structures, they may not fully stabilize foundations in expansive soils. In contrast, granular anchor piles offer a simpler alternative for resisting uplift forces. A numerical study was conducted to analyze the pullout loads, compressive loads, and heave behavior of these anchor techniques. The results demonstrate that granular anchor piles outperform helical piles in terms of pullout and compressive performance, with improvements ranging from 17% to 22.5% in pullout capacity and 0.5% to 19% in compressive capacity, depending on specific pile lengths and diameters examined. However, both techniques show similar effectiveness in reducing heave, achieving reductions of over 90% when specific conditions are met. Additionally, the use of high-rise cap piles contributes to significant heave reduction, effectively minimizing heave to nearly negligible levels compared to low-rise cap piles. It is found that the relative density of the granular material has a more pronounced effect on the pullout load compared to the compressive load, and its impact varies depending on the length of the pile. Therefore, it is recommended to avoid high relative density when the pile is entirely within the expansive soil while utilizing higher relative density is beneficial when the pile penetrates and settles in the stable zone.

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Numerical study of single helical piles and helical pile groups under compressive loading in cohesive and cohesionless soils

Cited by 39 publications

References 21 publications

Experimental Modelling of Helical Piles Subjected to Axial Loading

Experimental Modelling of Helical Piles Subjected to Axial Loading

A State-of-the-Art Review and Numerical Study of Reinforced Expansive Soil with Granular Anchor Piles and Helical Piles

Comparative Analysis of Helical Piles and Granular Anchor Piles for Foundation Stabilization in Expansive Soil: A 3D Numerical Study

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