Pile Foundation Design Through the Increased Bearing Capacity of Extended End Pile

Kim, Seung‐Ho; Whang, Seoung-Wook; Kim, Sang Yong

doi:10.3130/jaabe.16.395

Cited by 11 publications

(6 citation statements)

References 15 publications

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“…As a common form of deep foundation, high pile foundation is widely used in complex and difficult projects such as wharves, cross-sea Bridges, and viaducts of high-speed railway lines in Marine environments due to its good seismic performance, strong adaptability, and high bearing capacity [1]. The ratio of length to slenderness of a high pile foundation is much larger than that of a short, rigid pile, which is more prone to instability or large deformation under the action of a dynamic load, thus leading to the destruction of the pile foundation and superstructure.…”

Section: Introductionmentioning

confidence: 99%

Study on the Influence of Water Erosion on the Bearing Capacity and Function of the High Pile Foundation of the Wharf

Yang,

Zhang,

et al. 2024

Water

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High-pile foundation is a common form of deep foundation commonly used in ocean environments, such as docks and bridge sites. Aiming at the problem of bearing capacity of high pile foundations, this paper proposes the calculation of bearing capacity and the analysis of scour depth of high pile foundations under the action of scour based on the modified p-y curve. In this paper, three kinds of scour mechanisms—natural evolution scour, general scour, and local scour—are described; and the calculation methods of scour widely used at present are compared and analyzed. The solution of the vertical stress of soil around the pile under local scour is solved and applied to the β method to solve the lateral resistance of the pile under local scour. The local erosion is equivalent to the whole erosion, and the expression of the ultimate soil resistance before and after the equivalent is calculated, respectively, according to the principle that the ultimate soil resistance at a certain point above the equivalent pile end remains unchanged. The distance from the equivalent soil surface to the pile end can be obtained simultaneously, and then the equivalent erosion depth, p-y curve of sand at different depths, and high pile bearing capacity can be obtained. Finally, it is found that the bending moment of a single pile body varies along the pile body in the form of a parabola, and the maximum bending moment of the pile body is below the mud surface and increases with the increase in horizontal load. When the scouring depth is 30 m, the horizontal load is 25 KN, and the maximum bending moment of the pile body is about 150 N·m. The data with a relative error greater than 10% accounted for only 16.6% of the total data, and the error between the calculated value and the measured value was small. The formula can predict the erosion depth more accurately.

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Section: Introductionmentioning

confidence: 99%

Study on the Influence of Water Erosion on the Bearing Capacity and Function of the High Pile Foundation of the Wharf

Yang,

Zhang,

et al. 2024

Water

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“…Nguyen et al used feedforward neural network (FFN) to study the ultimate axial bearing capacity of PHC node piles [2]. Kim et al investigated the performance of Extended end (EXT) piles by field tests and confirmed that the bearing capacity of EXT piles is better than PHC piles [19]. Huynh et al developed a new direct SPT method using a genetic algorithm with function optimization, which can accurately predict the ultimate axial bearing capacity of PHC ball piles [20].…”

Section: Introductionmentioning

confidence: 99%

Field Test Study on the Bearing Capacity of Extra-Long PHC Pipe Piles under Dynamic and Static Loads

Xiao¹,

Liu²,

Zhou³

et al. 2023

Sustainability

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Pretensioned prestressed high strength concrete (PHC) pipe piles are widely used in various engineering foundations, which have the advantages of high single pile bearing capacity, strong adaptability to geological conditions and high degree of construction mechanization. In order to study the vertical compressive bearing performance and settlement characteristics of ultra-long PHC pipe piles, high strain dynamic detections and static load tests were carried out on four PHC piles with a diameter of 0.9 m on site. It can be seen from the field test that the bearing capacity of the prefabricated pipe piles was time-dependent. By the end of the dynamic test, the bearing capacity of each test pile increased by 27% to 66%. The static load test also verified the rationality of the value of the restitution coefficient. Therefore, the final bearing capacity of the pile foundation can be predicted by using the high strain initial driving results and the restitution coefficient, which can reduce the repeated driving process, effectively save the cost and improve the engineering efficiency. Under 2.1 times the design load, the change range of the pile concrete modulus is from 37.5 GPa to 52 GPa, the change range of the pile side friction resistance is from 0 kPa to 97 kPa and the change range of the pile end to pile bottom load ratio is from 0% to 7.54%. During the test, the shaft friction and end bearing of the lower part of the piles were not fully mobilized. The shaft friction resistance, the end resistance and the movement behavior of the pile top and the end of the piles can provide parameter references for the subsequent design and construction of the piles.

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“…The predicted ultimate bearing capacity results were verified through the static load test results of PRBS in historical cases, indicating that the finite element cavity expansion method is accurate and reliable. Kim [ 15 , 16 ] tested and analyzed the PHC pipe piles and EXT piles widely used in South Korea, and the results showed that compared with PHC piles, EXT piles with welded ring steel plates at the end increased the vertical bearing capacity by more than 20%, and could shorten the construction period and reduce the project cost. Gao [ 17 ] conducted a test study on 16 large-diameter hand-dug pile with enlarged bottom, and the results showed that increasing the diameter of enlarged bottom had a more significant effect on improving the bearing capacity than increasing the pile diameter.…”

Section: Introductionmentioning

confidence: 99%

Finite element simulation study on vertical bearing characteristics of single pile with ram-compacted bearing sphere

Bai,

Gong,

et al. 2023

PLoS ONE

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The pile with ram-compacted bearing sphere (PRBS)is a kind of special-shaped pile, the calculation formula of single pile bearing capacity stipulated in Chinese Standards JGJ/T 135–2018 is relatively simple, and the factors considered are not comprehensive enough. This article uses the finite element simulation software ABAQUS to simulate and calculate the compressive bearing characteristics of PRBS, and studies the changes in the vertical bearing characteristics of PRBS under different factors and working conditions (different pile lengths, pile diameters, and the diameters of ram-compacted bearing sphere (RBS)). The calculation results indicate that the PRBS still has a large axial force near the enlarged end of the pile bottom, and the RBS bears a large load. The vertical bearing capacity of the PRBS is mainly provided by the RBS, but the pile side friction still has a certain degree of influence on its bearing capacity. The maximum ratio of pile side frictional resistance to applied load can reach 18.41%. Compared with the ordinary pile, the bearing capacity of the PRBS is significantly improved. The ultimate bearing capacity of the PRBS with the RBS diameter of 1m is more than 5 times that of the ordinary pile under the same condition. Pile diameter has little influence on the bearing capacity of PRBS, while the change of RBS diameter has great influence on the bearing capacity of single pile. However, when the RBS diameter is too large, it is easy to cause the uplift of surrounding soil in the construction process and affect surrounding piles. Therefore, it is suggested that the optimal RBS diameter should be 800mm~1200mm. This study provides reference suggestions for the study of piles with ram-compacted bearing sphere.

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Pile Foundation Design Through the Increased Bearing Capacity of Extended End Pile

Cited by 11 publications

References 15 publications

Study on the Influence of Water Erosion on the Bearing Capacity and Function of the High Pile Foundation of the Wharf

Study on the Influence of Water Erosion on the Bearing Capacity and Function of the High Pile Foundation of the Wharf

Field Test Study on the Bearing Capacity of Extra-Long PHC Pipe Piles under Dynamic and Static Loads

Finite element simulation study on vertical bearing characteristics of single pile with ram-compacted bearing sphere

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