Parametric Study of Under-Reamed Piles in Sand

Christopher, Tanuja; Gopinath, B.

doi:10.17577/ijertv5is070450

Cited by 5 publications

(3 citation statements)

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“…In the same way, the enlargements of pile increased the tensile bearing capacity of these piles, making them appropriate for use in the foundation of structures such as centrifuges, piers, various transmission lines, and others [9]. Christopher and Gopinath [10] Study the behavior of under-reamed piles subjected to vertical loads by experimental work in sand soil compared with straight shaft pile, the pile and under-reamed diameter equal to 25 and 75 (mm) respectively. The results show that the under-reamed pile's bearing capacity is higher compared to the straight shaft, about 305%.…”

Section: Applications Of Under-reamed Pilesmentioning

confidence: 99%

Performance of Under-Reamed Piles in Collapsible Soil

2021

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One of the Iraqi geotechnical problems is the presence of gypseous soils covering about (27-36) percentage of Iraq soils containing gypsum between (10-70) ratios. The main reason for soil problematic is the gypsum dissolution when these soils are inundated. However, the soluble gypsum can be leached out of the soil particles, so these problems can be led to cracking, tilting, and collapsing the related soil structure and changing the soil properties. The aim of this work is to investigate the performance of under-reamed piles as a new, improved method to reduce the moisture sensitive and the primary triggering mechanism for the volume reduction of collapsible soil, which is considered as a non-elastic deformation; this was done by carrying series of inundation these soil with using different types of under reamed piles to arrive the best and suitable type useful in gypseous soils. The piles with reams are concrete piles with one or more ream, so under-reamed piles are suitable in weak soils where sizable ground movement, variations, filed up ground, silty clay, and loose sand which has the advantage to increase the soil strength. This paper includes the experimental model of under-reamed piles under static load simulated by a steel plate on the pile cap, then the load-settlement curve, friction force, and bearing force founded from the investigation of different patterns of reamed. It was found that a number of bulbs had a significant reduction on settlement reach to 93% in case of using triple under-reamed pile which is the greatest results in comparison with other patterns and reference pile of the uniform cross-section in the wet state.

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Section: Applications Of Under-reamed Pilesmentioning

confidence: 99%

Performance of Under-Reamed Piles in Collapsible Soil

2021

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“…The results showed that the capacity drops off when the bulb angle of the under-ream pile is increased, which is especially apparent at an angle of 75°. Christopher and Gopinath [9] showed that when the space between two bulbs was increased up to 150 mm, an increase in pile capacity occurred. The improvement in load-carrying capacity becomes smaller as the spacing increases.…”

Section: Introductionmentioning

confidence: 99%

Experimental Work on the Effect of Under-reamed Pile Geometry on the Pullout Capacity of Sand

Al-Bayati

Al-Neami

Rahil

2023

IJE

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This work presents an experimental study that investigates the behavoir of both conventional and underreamed piles embedded in a single layer of sand with varying relative densities and examines piles in different soil layers, subjected to pullout static monotonic loading. The study focuses on the influence of the spacing ratio between under-reams and the number of bulbs on the pile's ultimate pullout load. A uniform pile stem, a pile with a single bulb, and a pile with twin bulbs were the three varieties of smallscale models of aluminum piles that were utilized. The pile's measurements were 25 mm in shaft diameter by 550 mm in height, with a 62.5 mm bulb diameter. To establish their impact on the uplift capability of an under-reamed pile in sand, the current work examines the location, spacing between bulbs, and the number of bulbs. At 35% relative density, the influence of various bulb spacing ratios S/Du is investigated (S/Du =1.0, S/Du = 1.25, S/Du = 1.5, S/Du = 1.75, and S/Du = 2). The test results revealed that the maximum ultimate pullout capacity is achieved when the bulb spacing ratio is S/Du =1.5. The pullout capacity increases 3.5 times for a single bulb and 7 times for a double bulb compared with a straight pile under the same condition, as well as an under-reamed pile in a dense or medium sand layer overlain by loose sand rises to a peak before capacity declines. Load-displacement curves and initial stiffness improve compared to homogeneous, loose, sandy soil.

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“…The capacity of the piles in compression and tension was significantly impacted by the number, size, shape, and position of the bulbs [19]. Various studies were also conducted to understand the influence of geometrical features of the underreamed pile on its ultimate capacity by Christopher and Gopinath [20], Shetty et al [21] and Shrivastava and Bhatia [22].…”

Section: Introductionmentioning

confidence: 99%

Studies on the Performance of Under-reamed Piles in Sandy Soil through Model Tests

Nariyelil,

Minu,

Mathews Abraham

et al. 2023

Challenges and Advancements in Civil Engineering

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Predicting pile behavior and estimating pile capacity in different soil conditions are critical in building industry. This paper describes an experimental study which is aimed to comprehend some factors affecting the under-reamed pile capacity in sand i.e. the bulb angle and bulb spacing. It also compares the variation of capacities of these piles in sand in both loose and dense state. A total of 9 model piles were tested, which included four single under-reamed piles, four double under-reamed piles and a normal pile. From the experimental studies, load–settlement curves are obtained and the pile capacities are determined using various criteria reported in the literatures. The capacity increased to at least twice the value when an under-ream bulb was introduced to a normal pile. The pile with bulb angle of 450 and with bulb spacing of 1.25 times the bulb diameter showed maximum capacity for single under-reamed and double under-reamed piles, respectively. The pile capacity increased with increase in sand density. The test results are in agreement with the relevant Indian Standards.

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Parametric Study of Under-Reamed Piles in Sand

Cited by 5 publications

References 0 publications

Performance of Under-Reamed Piles in Collapsible Soil

Performance of Under-Reamed Piles in Collapsible Soil

Experimental Work on the Effect of Under-reamed Pile Geometry on the Pullout Capacity of Sand

Studies on the Performance of Under-reamed Piles in Sandy Soil through Model Tests

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