A study on the bearing capacity of steel pipe piles with tapered tips

Matsumiya, Hironobu; Ishihama, Yoshiro; Taenaka, Shinji

doi:10.3208/jgssp.jpn-20

Cited by 4 publications

(4 citation statements)

References 8 publications

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“…Matsumiya et al [10] evaluated the behavior of five piles with varied tapered tip diameters. The piles were evaluated under static compression while being set up in different sand densities, and the results showed that the tapered tip produced less soil plugging and had lower pile resistance than the straight shaft pile.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Open-Ended Pipe Pile Embedded in Sand Using Steel Collar

Farhood,

Abdul–Husain

2023

E3S Web Conf.

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The open-ended pipe piles are among the piles that are employed the most frequently because of their advantages, including their ease of transport and resistance to driving stress. It is further distinguished by the fact that the soil column formed inside the pile increases the pile capacity. Numerous ideas have been presented forth in the literature to enhance the performance of these piles. In this study, it is suggested that a steel collar be used at its lowest end to enhance the performance of the pile. Ten experimental tests for piles embedded in loose sand soil were carried out to determine the impact of the collar diameter and length concerning the pile diameter and length. Three diameters, 1.5D, 2D, and 3D, and three length ratios: 10, 20, and 30% were employed. The use of a steel collar improves the load capacity of the pile and reduces settlement, according to the data, although the collar with a diameter of 1.5D and a length of 10% had little effect. According to the study, using a collar with a diameter of 2D and a length of 20% is enough to double pile capacity and prevent the overlapping effect of stress bulbs between neighboring piles. As a result, using such a method minimizes the cost of constructing the foundations because of the reduction in the number of piles required.

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Section: Introductionmentioning

confidence: 99%

Enhancement of Open-Ended Pipe Pile Embedded in Sand Using Steel Collar

Farhood,

Abdul–Husain

2023

E3S Web Conf.

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“…In the case of open-ended steel pipe piles (OESPP), frictional forces are acting on both outer pile shaft surface and inner pile shaft surface. The external frictional resistance on outer pile surface is mobilized between pile surface and the pile's surrounding ground, while the internal frictional resistance on inner pile surface is exerted between pile surface and plugged soils resulted from pile installation process [1]. Examination of these external and internal frictional resistance characteristics is important to evaluate their separate effects on pile ultimate load and behaviour.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of Pipe Pile Behaviour in Clays Considering Inner and Outer Shaft Frictions

Lee¹,

Choi²,

Park³

et al. 2018

World Congress on Civil, Structural, and Environmental Engineering

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Axial resistance of open-ended steel pipe pile is influenced by the external frictional resistance generated between the outer pile surface and its surrounding soils and the internal frictional resistance generated between the pile inner surface and plugged soils. For the assessment of axial pile resistance including its ultimate load, characteristics of both external and internal shaft frictional resistances should be examined. However, limited previous research was available. In this study, the effects of frictional resistance characteristics on the long-term ultimate loads were analysed through numerical analysis. As results, the long-term pile ultimate loads were numerically quantified. It was found that the effect of the outside friction coefficient on pile resistance was more significant compared with inside friction coefficient's contribution on pile resistance.

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“…The uniform section pile has a mature theory and rich construction experience, while the tapered pile has a high bearing capacity and economic advantage due to the special sloped sidewall. By conducting a model test on the tapered pile, Matsumiya H. et al [20][21] showed that under the same conditions, the bearing capacity per unit volume of the tapered friction pile is 0.5 to 2.5 times higher than that of a common cylinder friction pile, but its engineering cost of foundation treatment is 40% to 60% lower than the latter. By combining the advantages of the rammed cement soil pile and the tapered pile, He J. et al [22][23][24] discussed the bearing capacity advantages of cement soil tapered piles through a model test and proposed a reasonable wedge angle range.…”

Section: State Of the Artmentioning

confidence: 99%

“…After 28 d, the unconfined compressive strength of the rammed cement soil was measured at 0.95 MPa. The deformation modulus of the rammed cement soil was measured at 81.3 MPa by using the test method proposed by Ye S. L. [20].…”

Section: Pile Formation and Test Processmentioning

confidence: 99%

Experimental Study on the Performance of Geosynthetic-Reinforced and Tapered Pile- Supported Composite Foundation

Li¹,

Zhen-bin²,

He³

et al. 2017

JESTR

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Reinforced cushion and pile are two important components of the geosynthetic-reinforced and pile-supported (GRPS) composite foundation. Studies on the traditional GRPS composite foundation with uniform section piles have compared the performance of GRPS before and after the reinforcement of cushion yet neglects the effects of reinforcement type and pile shape on this composite foundation. To address this problem, the geosynthetic-reinforced and tapered pile-supported (GRTPS) composite foundation with section-variable piles was proposed in this study as a new form of the GRPS composite foundation. The settlement of the proposed composite foundation and the stress distribution on piles and soil under three cushion conditions (gravel cushion (GC), geogrid-reinforced cushion (GGRC), and geocell-reinforced cushion (GCRC)) were analyzed through a static test by using three models of specimens with nine piles. Test results demonstrate that under the test load, the pile-soil settlement differences under GGRC and GCRC are 43.4% to 49.8% and 34.7% to 39.8% of that under GC. Meanwhile, the pile-soil stress ratios under GGRC and GCRC are 1.47 to 1.88 and 1.77 to 2.08 times of that under GC. The reinforced cushion can effectively reduce the settlement of the composite foundation and the pile-soil settlement difference, increase the pile-soil stress ratio, and relieve stress concentration in some piles. GCRC can improve the performance of the GRTPS composite foundation more effectively than GGRC under the same conditions. No negative friction region is observed on the upper piles in the GRTPS composite foundation. The tapered piles are better than the uniform section ones as well as can increase the bearing capacity and decrease the settlement of the composite foundation. The findings of this work can provide references for the engineering design and application of the GRTPS composite foundation.

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A study on the bearing capacity of steel pipe piles with tapered tips

Cited by 4 publications

References 8 publications

Enhancement of Open-Ended Pipe Pile Embedded in Sand Using Steel Collar

Enhancement of Open-Ended Pipe Pile Embedded in Sand Using Steel Collar

Numerical Study of Pipe Pile Behaviour in Clays Considering Inner and Outer Shaft Frictions

Experimental Study on the Performance of Geosynthetic-Reinforced and Tapered Pile- Supported Composite Foundation

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