Pullout Behavior of Granular Pile-Anchors in Expansive Clay Beds In Situ

Rao, A. Jagannadha; Phanikumar, B. R.; Babu, R. Dayakar; Suresh, K.

doi:10.1061/(asce)1090-0241(2007)133:5(531)

Cited by 68 publications

(33 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A well-documented study on the GAP system has been carried out in the laboratory and field study before its application to actual field conditions [6][7][8][9][10]. The parametric analysis was performed to determine the ultimate pullout capacity of GAP in homogenous and non-homogenous soft ground [11,12].…”

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.

View full text Add to dashboard Cite

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.

show abstract

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.

View full text Add to dashboard Cite

show abstract

“…Granular pile-anchor (GPA) foundation is another innovative technique recently devised for controlling heave of expansive clay beds (Phanikumar 1997;Phanikumar et al , 2008Rao et al 2007Rao et al , 2008. In a granular pile-anchor (GPA), a modification of the conventional granular pile, the foundation is anchored to an anchor plate or a base plate at the bottom of the granular pile through a mild steel anchor rod.…”

mentioning

confidence: 99%

“…Equations 1 and 2, which are written for a single GPA, can be modified according as the number of GPAs increases. Tests performed on laboratory scale GPAs (Phanikumar 1997;) and field scale GPAs (Rao et al 2007Phanikumar et al 2008) established the efficacy of GPA foundation system in controlling heave and improving the engineering properties of the ambient expansive clay beds. Engineering behaviour of GPAs subjected to alternate swell-shrink cycles has not been studied so far.…”

mentioning

confidence: 99%

Shrinkage Behaviour of GPA-Reinforced Expansive Clay Beds Subjected to Swell–Shrink Cycles

Muthukumar

Phanikumar

2014

Geotech Geol Eng

Self Cite

View full text Add to dashboard Cite

show abstract

“…Recent research has shown that the granular pile-anchor foundation technique is quite efficacious in controlling heave (Phanikumar, 1997;Rao et al, 2007). A granular pile-anchor (GPA) is an innovative modification of the conventional granular pile.…”

Section: Introductionmentioning

confidence: 99%

Reducing heave of expansive clay beds through granular pile–anchor groups

Phanikumar¹,

Muthukumar²

2014

Proceedings of the Institution of Civil Engineers - Ground Impr

Self Cite

View full text Add to dashboard Cite

The granular pile-anchor (GPA) foundation system, a more recent technique, has also been found to be quite successful in controlling heave of expansive clay beds. This paper presents experimental data obtained from laboratory-scale heave tests conducted on an unreinforced expansive clay bed (n = 0) and expansive clay beds reinforced by a single GPA (n = 1), twin GPAs (n = 2) and a group of GPAs laid in equilateral triangular pattern (n = 3). The thickness of all the test clay beds was 200 mm. Heave was monitored at different depths of clay beds as they were inundated. Ground heave (or surface heave) was also monitored at different radial distances (r) from the centre of the test tank. The unreinforced clay bed and the GPA-reinforced clay beds were identical with regard to thickness (H), placement water content (w%) and dry density (γd). Heave decreased at all depths of the clay beds as the number of the GPAs (n) increased. Furthermore, heave decreased with increasing depth (z) from the top of the clay beds. Heave was measured to be 56·5, 48, 28·5 and 24 mm at the top of the clay bed, respectively, for n = 0 (unreinforced expansive clay bed), n = 1, 2 and 3, indicating increased resistance to heave with increasing number of GPAs. The factor of safety of the GPA foundation system against uplift also increased with increasing number of GPAs.

show abstract

Pullout Behavior of Granular Pile-Anchors in Expansive Clay Beds In Situ

Cited by 68 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

Shrinkage Behaviour of GPA-Reinforced Expansive Clay Beds Subjected to Swell–Shrink Cycles

Reducing heave of expansive clay beds through granular pile–anchor groups

Contact Info

Product

Resources

About