Numerical and Experimental Investigations of Granular Anchor Piles in Loose Sandy Soil Subjected to Uplift Loading

Kranthikumar, A.; Sawant, V. A.; Kumar, Pramod; Shukla, Sanjay Kumar

doi:10.1061/(asce)gm.1943-5622.0000733

Cited by 39 publications

(12 citation statements)

References 6 publications

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“…A very few field studies have been performed on GAP system in loose cohesionless soils in literature [1,15]. Kranthikumar et al [16] analyzed GAP system in loose cohesionless soils using Plaxis-3D and presented a detailed parametric study for single pile system.…”

Section: Introductionmentioning

confidence: 99%

Numerical Modeling of Granular Anchor Pile System in Loose Sandy Soil Subjected to Uplift Loading

Kranthikumar

Sawant

Shukla

2016

Int. J. of Geosynth. and Ground Eng.

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During the last few decades various researchers have proposed appropriate experimental and numerical methods to estimate the uplift capacity of granular anchor piles (GAPs) in expansive soils. Surprisingly, very few studies have been performed to determine the uplift capacity of GAPs in loose sands. This paper presents the results of the numerical study to estimate the ultimate uplift capacity of group piles. Numerical analysis is performed using finite element software PLAXIS-3D. The foundation system is assumed to consist of a different number of regularly spaced GAPs installed in loose sandy soils. The analysis examines the influence of factors such as number of piles n and length L to width D ratio, and properties of the granular pile material and compares the efficiency of group of GAP systems of different configurations. Keywords Granular anchor pile Á Finite element method Á Loose sand Á Group piles Á Uplift capacity Notations L Length of a pile (m) D Diameter of a pile (m) c Total unit weight of soil above the water table (kN/m 3) c sat Saturated unit weight of soil (kN/m 3) / Angle of internal friction of soil (°) c Cohesion of soil (N/m 2) m Poisson's ratio E s Elastic modulus of surrounding soil (kPa) E p Elastic modulus of pile material (kPa) E Elastic modulus of plate element (kPa) d Thickness of a plate element (m) S Centre to centre spacing between piles in group piles (m) n Number of piles in a pile group g Efficiency & V. A.

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Section: Introductionmentioning

confidence: 99%

Numerical Modeling of Granular Anchor Pile System in Loose Sandy Soil Subjected to Uplift Loading

Kranthikumar

Sawant

Shukla

2016

Int. J. of Geosynth. and Ground Eng.

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“…Various researchers [1]- [5] investigated the pullout behavior and found that the pullout forces increased as the surface area of the granular pile anchor increased. Similarly, researchers has investigated the heave behavior [6], heave and pullout [7], heave and shrinkage [8,9] uplift force [10] and found that the granular pile anchor is effective in improving the soil condition. In this paper, study focus to find best depth of granular pile anchor to extend from active zone to stable zone to control the heave and uplift pressure.…”

Section: Introductionmentioning

confidence: 99%

Foundation Failures Mitigation under Expansive Clay by Using Granular Pile Anchor System

Sfoog¹,

Siang²,

Naji³

et al. 2020

IJIE

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Expansive soils are found in typical areas in the world especially in arid and semi-arid regions. The problems associated with this type of soil drive geotechnical engineers to invent new technologies as remediation’s such as physical and chemical treatments. Innovative foundation techniques were also suggested for remedying the swell-shrink problems of the expansive soil. The granular pile anchor (GPA) is relatively a more favorable technique indebted to its cost-effective, easy and fast to assemble and most importantly was found to be more efficient in remedying the expansive soil. Despite the extensive studies on the expansive soil remedies, yet the granular pile anchor system requires more comprehensive and in-depth investigations. This study is aimed at developing a model with granular piles of various length and diameter extended to the stable zone to investigate the heave and uplift pressure in the expansive soil. For this purpose, experimental and numerical analysis were conducted in a small and in a full scale model respectively. A significant improvement was attained in heave reduction and an increment of uplift capacity. The findings also show that heave decreased significantly when the length and diameter of the GPA increases while the uplift capacity increased. However, it was noted that the extension of length to the stable zone resulted in insignificant changes. Therefore, it can be concluded that the maximum length of 6 m is the ideal length for GPA with different diameters according to foundations design requirement for this particular type of soil.

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“…Among the early studies on the GPA system comes from the laboratory investigation carried out by [8]. More recent studies have been conducted on GPA with various parameters to investigate based on geosynthetic pullout load and rate of heave [9,10]; pullout in field-scale [7]; heave in field study [11,12]; heave and uplift [13]; cycles of swelling and shrinkage [14]; geogrid reinforcement on uplift capacity [15]; uplift capacity [16]; relative density of GPA fill material and encasement effects on the pull capacity [17]; comparison between the GPA and helical pile anchors [18]; geosynthetic encasement [19]; and pullout forces [20,21].…”

Section: Introductionmentioning

confidence: 99%

Ground improvement using granular pile anchor system: resistance to heave and uplift pressure

Siang

Sfoog

Naji

et al. 2020

IJEECS

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<span lang="EN-GB">Expansive soil is found in many parts of the world where its major drawback is its expansion and shrinking property upon moisture absorption and drying during alternation of rainy-dry seasons. Due to its swelling-shrinkage repeated process, fatigue and distress cause crack to structures. Granular pile anchor (GPA) system is a pioneering technique that is utilised in reinforcing these expansive soils. Granular pile anchor (GPA) system is a pioneering technique that is utilised in reinforcing expansive soils. The GPA provides tensile resistance which arrest the exerted upward forces and hence reducing heave. Previous investigations have only focused on load-displacement relationships by utilizing the pull-out technique. In this technique, an external force pulls the GPA and the corresponding displacements are recorded. The results provide indication of the GPA resistance to the applied force. However, in real conditions the heave and expansion forces were developed as a result of the pressure caused by the water absorption which pushes the entire soil bed in the upward direction along with the GPA. Therefore, this paper is aimed to explore this concept by carrying experimental and numerical investigations on a small scale model for a single pile with a diameter of 4 cm, with lengths of 20 and 40 cm. Ultimately, the reinforced soil exhibits reduction in upward force and heave compared to the unreinforced soil. Also, verifications for the testing shows that the relationship between the upward force and heave exhibits almost linear relationship for both experimental and numerical investigations. Therefore, shallow foundations incorporated with a GPA system proves to effectively lessen the heave that occurs in expansive soils which in turn can solve problems for constructions.</span>

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Numerical and Experimental Investigations of Granular Anchor Piles in Loose Sandy Soil Subjected to Uplift Loading

Cited by 39 publications

References 6 publications

Numerical Modeling of Granular Anchor Pile System in Loose Sandy Soil Subjected to Uplift Loading

Numerical Modeling of Granular Anchor Pile System in Loose Sandy Soil Subjected to Uplift Loading

Foundation Failures Mitigation under Expansive Clay by Using Granular Pile Anchor System

Ground improvement using granular pile anchor system: resistance to heave and uplift pressure

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