Model test study on single and group under-reamed piles in sand under compression and tension

Majumder, Mantu; Chakraborty, Debraj; Kumawat, Vishal

doi:10.1007/s41062-021-00725-4

Cited by 8 publications

(3 citation statements)

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“…The presence of a bulb alters and enhances the load-settling behavior of an under-reamed pile, as well as the bearing capacity in relation to pile depth of embedment and clay soil cohesiveness. The increase in bearing load occurs due to adding a bulb to the shaft which leads to an increase in the projected bearing area [12] . While, Figure 5 presents the load-settlement relationship for an under-reamed pile with one, two, and three bulbs in stiff clay, pile length to diameter ratio (L/D) = 30, and bulb diameter ratio (Du/D = 2.5), the corresponding capacities are (2452, 3013 and 3370) kN for bulbs number (N = 1, 2, and 3) respectively.…”

Section: Resultsmentioning

confidence: 99%

“…It can be seen that the existence of such a bulb with a sufficient number can significantly improve the pile capacity and decrease the settlement. The increase in bearing load occurs due to adding a bulb to the shaft, which leads to an increase in the projected bearing area [12] . However, Figure 6 presents the load-settlement relationship for an under-reamed pile with a number of bulbs (N = 2) in stiff clay, pile length to diameter ratio L/D = 30 and bulb diameter ratios (Du/D = 2).…”

Section: Resultsmentioning

confidence: 99%

“…The under-reamed piles that have been constructed in Taihang Mountain, China, the project have a stem diameter of 0.7 m, a pile length of 32 m, a bulb diameter of 1.4 m, and two numbers of bulbs. The concrete grade used in the design is C40 for all piles [12] . under-reamed piles were used in the Eastern Expressway project in Ningbo, China.…”

Section: Introductionmentioning

confidence: 99%

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Geometrical Effect of Under-reamed Pile in Clay under Compression Load Numerical-Study

Nasr¹,

Azzam²

2023

adv. in geol. and geotech. eng. res.

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Recently, the use of deep foundations has increased as a result of the expansion in the construction of high-rise buildings, train tracks, and port berths. As a result of this expansion, it was necessary to use deep foundations that have low cost, high bearing loads, low settlement, and construction time, and such foundations are subjected to different types of loads such as lateral, vertical compression, and tension loads. This research paper will present one of the most important types of deep foundations that are aptly used in such structures and the most important factors affecting their bearing capacity and settlement in stiff clay. This type of deep foundation is called an under-reamed pile. The factors used in this study are pile length to diameter ratio L/D = 30, bulb diameter ratio (Du/D = 1.5, 2, 2.25, and 2.5), number of bulbs (N = 1, 2, and 3), and spacing ratio (S/D = 2 to 8). To investigate the effects of these parameters and obtain optimal results, the PLAXIS 3D was used. The analysis shows that the increase in bulb diameter increases the bearing load by 43%. Bulb spacing controls the failure mechanisms, whether cylindrical shear failure or individual failure and increases the capacity by 66% and 99%, respectively, for two and three bulbs when the bulb spacing becomes S/D = 8. When the number of bulbs increases to three, the capacity increases by 90%. If each bulb works individually, the bearing capacity doubles

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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