Abstract
Prestressed high-strength concrete (PHC) pipe piles have been widely used in engineering fields in recent years; however, the influencing factors of their ultimate bearing capacity (UBC) in multilayer soil need to be further studied. In this paper, a static load test (SLT) and numerical analysis are performed to obtain the load transfer and key UBC factors of pipe piles. The results show that the UBC of the test pile is mainly provided by the pile shaft resistance (PSR), but the pile tip resistance (PTR) cannot be ignored. Many factors can change the UBC of pipe piles, but their effects are different. The UBC of the pipe pile is linearly related to the friction coefficient and the outer-to-inner diameter ratio. Changes in the pile length make the UBC increase sharply. Low temperatures can produce freezing stress at the pile–soil interface. The effect of changing the Young modulus of pile tip soil is relatively small.
Highlights
Pile foundations have the advantages of a high bearing capacity, small settlement, convenient construction, strong resistance to complex loads and great applicability to various geological conditions [1,2]
As a new form of pile, a prestressed high-strength concrete (PHC) pipe pile adopts the assembly construction method, which has the advantages of high industrialization, easy quality assurance, short manufacturing cycles and low resources; it has been popularized on a large scale in recent years [4]
The practice of utilizing PHC pipe piles is not based on theory; experience is considered more important than the relevant science and technology, the wide use of PHC pipe piles at large scales does not fully utilize advanced technology
Summary
Pile foundations have the advantages of a high bearing capacity, small settlement, convenient construction, strong resistance to complex loads and great applicability to various geological conditions [1,2]. Some scholars have conducted SLTs on pipe piles to obtain the UBC of pipe piles, comparing the results with those from the is the key point affecting capacity. The variations in pile bearing the interior of pipe piles produce additional friction, which improves the UBC to a certain capacity with service time [21,22] and different soil conditions [23,24,25] have received extent and has been studied by many scholars [17,18,19,20]. A static load test establish a pile–soil interaction model to explore the key factors affecting the UBC of pipe (SLT) to obtain the load transfer of the pipe pile in multilayer soil.
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