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

Xiao, Yonggang; Liu, Xiaomin; Zhou, Jianjiang; Song, Liwei

doi:10.3390/su15065161

Cited by 4 publications

(1 citation statement)

References 30 publications

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“…Strain and acceleration sensors (two of each type) are installed below the pile head. These [27] Dynamic load tests are used to provide on-site estimates of the bearing capacity of piles. The Pile Driving Analyzer (PDA) system is specially used for dynamic load testing and drive monitoring.…”

Section: Piling Dynamic Load Tests [27]mentioning

confidence: 99%

Research on Dynamic Pile-Driving Formula Parameters and Driving Feasibility of Extra-Long PHC Pipe Piles

et al. 2023

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Prestressed high-strength concrete (PHC) pipe pile has the advantages of high single pile bearing capacity, a wide range of applications, good driving resistance, fast construction speed, etc. It has been widely used in high-rise buildings, bridges, ports, and other industries. The application of extra-long PHC pipe piles with a length of more than 50 m is increasing. However, there are few studies on the drivability and hammering criteria of extra-long PHC piles. To analyze the drivability of extra-long piles and predict their bearing capacity, in this paper, high-strain dynamic tests were carried out on 14 test sections with the pile foundation of Temburong Bridge in Brunei as the research background. The hammer stop control criteria calculated according to the Hiley formula would lead to excessive hammering. Three types of damage occurred during construction: pile shaft breakage, weld tearing, and pile head breakage. The weight and drop height of the piling hammer selected for this project were appropriate, and the extra-long test piles can be hammered to the design depth. The values of Cp (Compression of the pile) and n (the efficiency of the blow) were fitted based on the dynamic test data, which provided a more accurate reference for the selection of subsequent piling parameters of the project. It provides a more accurate calculation method for predicting the bearing capacity of extra-long PHC piles and provides control criteria for pile stopping and a scientific basis for their design and construction.

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Section: Piling Dynamic Load Tests [27]mentioning

confidence: 99%

Research on Dynamic Pile-Driving Formula Parameters and Driving Feasibility of Extra-Long PHC Pipe Piles

et al. 2023

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Modelling the Mechanical Behaviour of the RC Pipe Pile with Construction-Induced Damage and Cracks

Yu,

Wang

2024

Lecture Notes in Civil Engineering

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During the construction of the high-piled wharf, cracks may be induced in the top zone of the pre-stressed high-strength concrete pipe pile due to the high-frequency hitting. In this paper, the influence of the construction-induced damage and cracks on the mechanical properties of prestressed reinforced concrete (RC) pipe piles is studied. Finite element analysis is used to simulate the mechanical behaviour of the RC pipe piles with construction-induced damage and the corresponding ultimate bearing capacity of the damaged RC piles is predicted. Influence of different lengths of the construction-induced damage zone and maximum crack widths within the damage zone on the mechanical behaviour of the RC pipe pile is discussed. Results indicate that, the ultimate bearing capacity of the RC pipe piles with construction-induced damage in the top zone of the pile is reduced due to the damage. The failure of the RC pipe piles with construction-induced damage may occur at both the bottom and middle part of the pile for longer damage length and wider maximum crack width.

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Enhancing Quality Management of PHC Piles through Improved Driving Formulas: A Comprehensive Review and Analysis

Kim,

Seo,

Kim

et al. 2024

Applied Sciences

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In construction projects, conducting dynamic load tests on all piles proves impractical. Selective testing estimates bearing capacity, while the remaining piles rely on penetration depth for management. This approach, however, faces reliability issues due to varying conditions among piles. Technological advancements, such as non-contact hammers and sensors, have enhanced the accuracy of penetration depth measurements during final driving. Nonetheless, relying solely on penetration depth for construction and quality management remains problematic. This study, therefore, focuses on enhancing the use of driving formulas to improve pile quality management, particularly for the widely used pre-stressed high-strength concrete (PHC) piles. To improve pile quality management, existing driving formulas underwent review and refinement. Utilizing 258 dynamic load test data from various sites, the Hiley, Gates, and Danish formulas underwent validation through statistical analysis and graphical comparison. Enhancements to the Gates formula, achieved through curve fitting with actual data and the application of segment-based coefficients, demonstrated increased accuracy in bearing capacity estimation. These improvements offer a more reliable approach to pile quality management in construction projects.

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

Cited by 4 publications

References 30 publications

Research on Dynamic Pile-Driving Formula Parameters and Driving Feasibility of Extra-Long PHC Pipe Piles

Research on Dynamic Pile-Driving Formula Parameters and Driving Feasibility of Extra-Long PHC Pipe Piles

Modelling the Mechanical Behaviour of the RC Pipe Pile with Construction-Induced Damage and Cracks

Enhancing Quality Management of PHC Piles through Improved Driving Formulas: A Comprehensive Review and Analysis

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