Static Load Test and Numerical Analysis of Influencing Factors of the Ultimate Bearing Capacity of PHC Pipe Piles in Multilayer Soil

Li, Xusen; Zhang, Jiaqiang; Xu, Hao; Shi, Zhenwu; Gao, Qingji

doi:10.3390/su132313166

Cited by 7 publications

(4 citation statements)

References 19 publications

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“…The pile-soil stress ratio is often used to explain the sharing state of pile and soil on the action of the upper load in composite foundations [25]. In general, with the increase of the stiffness difference between the pile and soil, the stress in the composite foundation gradually concentrates to the pile, and the pile-soil stress ratio of the composite foundation increases [26]. The vertical stress P t on the pile and the vertical stress P s on the soil can be measured from the earth pressure box placed on the top of the pile and the surface of the foundation.…”

Section: Sharing Law Of Pile-soil Stressmentioning

confidence: 99%

Static and Dynamic Load Transfer Behaviors of the Composite Foundation Reinforced by the Geosynthetic-Encased Stone Column

et al. 2023

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An accurate description of the load transfer behaviors of the geosynthetic-encased stone column (GESC) is of great importance for revealing the bearing capacity of GESC. Static load tests and shake table model tests were performed to characterize the static and dynamic load transfer behaviors of the composite foundation reinforced by the GESC. Under static loading, static load tests were conducted on a fully geosynthetic-encased stone column (FGESC), partially geosynthetic-encased stone column (PGESC) and traditional stone column (TSC). The influence of length and stiffness of the encasement on the stone columns were investigated. Under seismic loading, the shake table model tests were performed to analyze the differences of the dynamic pile-soil stress responses between the composite foundations with the GESC and the TSC. The results show that the static pile-soil stress ratios of the composite foundation with the FGESC are about three to six times of those of the composite foundation with the TSC, and the difference increases with the increase in the stiffness or length of the encasement. The static vertical stress of 60% acting on the pile top can be transferred to the pile bottom for the FGESC, while only 27~45% for the TSC. The dynamic pile-soil stress ratios of the GESC and the TSC first decrease and then increase slightly with the increase of the input peak acceleration. The dynamic pile-soil stress ratio of the GESC is about three times that of the TSC under seismic excitation with the same type and peak acceleration. The attenuation rate of dynamic stress along the pile body under dynamic loading is much faster than that under the static loading. Under the static and dynamic conditions, the load transfer capacity and pile efficacy of the GESC are always better than those of the TSC.

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Section: Sharing Law Of Pile-soil Stressmentioning

confidence: 99%

Static and Dynamic Load Transfer Behaviors of the Composite Foundation Reinforced by the Geosynthetic-Encased Stone Column

et al. 2023

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“…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]. Li et al investigated the effect law of the pile-soil friction coefficient, inner and outer diameter ratio, pile length and temperature on the ultimate bearing capacity by a static load test [21]. Choi et al evaluated the vertical bearing capacity by conducting static load tests on noiseless and vibration-free helical PHC piles installed by different methods [22].…”

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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“…Therefore, the study of the stress changes at the pile soil interface during the penetration of jacked piles has become the primary issue in the study of jacked pile technology, to study the problem of pile-soil interface (Ma et al 2022;Ding et al 2021;Yazdani et al 2019;Ding et al 2020;Yang et al 2022), first, we should understand the interaction between the structure and soil under the influence of external conditions (Ahn et al 2021;Li et al 2017;Tran et al 2022), mechanical properties between different soils and piles under different factors Soundara et al 2017;Song et al 2022;Ai et al 2021;Liu et al 2019;Peng et al 2014;Goit et al 2021;Jin et al 2022), and use numerical simulation for analysis (Li et al 2021;Bao et al 2022;Lee et al 2012).…”

Section: Introductionmentioning

confidence: 99%

Green environmental static pressed pile penetration mechanism based on FBG-MEMS joint test technology

Wang

et al. 2023

Preprint

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Green environmental static pressure pile technology has always been one of the problems that many scholars urgently need to study. For the stress test of pile-soil interface, this experiment designed the FBG-MEMS joint test technology between the pile-soil interface during the penetration of static pressure piles in cohesive soil. In this test, a model pile is set up in the model bucket. By studying what effects will happen to the pile-soil interface when the pile is in different positions in the bucket, and studying how the boundary effect affects the changes of the indoor test results, the loading device and monitoring system are used to test the pile pressing force, pile shaft axial force and pile-soil interface stress generated during the penetration of the model pile in the model box. The preliminary test verifies the characteristics of simple operation and high accuracy of the test, and also draws the conclusion that with the increase of the penetration depth, the axial force of the pile shaft and the effective lateral pressure of the pile-soil interface increase, but the lateral pressure at the same depth gradually decreases. In addition, the influence of boundary effect is further analyzed. Finally, it is concluded that the boundary effect will increase the pile driving force, pile shaft axial force and effective side friction. The research results have important reference significance for green environmental protection static pressure pile technology in practical engineering.

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Static Load Test and Numerical Analysis of Influencing Factors of the Ultimate Bearing Capacity of PHC Pipe Piles in Multilayer Soil

Cited by 7 publications

References 19 publications

Static and Dynamic Load Transfer Behaviors of the Composite Foundation Reinforced by the Geosynthetic-Encased Stone Column

Static and Dynamic Load Transfer Behaviors of the Composite Foundation Reinforced by the Geosynthetic-Encased Stone Column

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

Green environmental static pressed pile penetration mechanism based on FBG-MEMS joint test technology

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