UPLIFT BEHAVIOR OF PYRAMIDAL-PRISMATIC PILES IN CLAY SOIL
Bekbasarov I. Shanshabayev N.A.
2023National Academy of Sciences of the Republic of Kazakhstan
News of the National Academy of Sciences of the Republic of Kazakhstan, Series of Geology and Technical Sciences
2023#2023Issue 576 - 88 pp.
The field-testing results of large-scale models of reinforced concrete driven pyramidal-prismatic piles with different lengths of the pyramidal part are presented. The uplift bearing capacity of piles are estimated. It has been established that the uplift behavior of pyramidal-prismatic piles can be either greater (by 1.26–1.78 times) or less (by 13–51.0 %) compared with conventional prismatic and pyramidal piles. It was founded that the increasing the length of the pyramidal part of the testing piles increases their bearing capacity by 1.19–1.67 times. It is shown that the lifting out of piles from the soil base, regardless of their longitudinal shape, is characterized by a phase of elastic resistance, a phase of plastic resistance and a phase of avulsion, which sequentially follow each other. It is established that the loads values in the end of the elastic resistance phase and on the beginning of the avulsion phase depend on piles longitudinal shape, and for pyramidal-prismatic piles also on the length of their pyramidal part. It is revealed that the length of the pyramidal part of pyramidal-prismatic piles has a positive effect to the soil resistance forces along the lateral surface of the piles, including the elastic resistance forces of the soil. Correlation dependences for determining the uplift capacity of pyramidal-prismatic piles are proposed. The research results can be as the basis for the recommendations development for the calculation and design of pyramidal-prismatic piles.
bearing capacity , displacement , lateral surface , model , pyramidal-prismatic pile , soil , ultimate resistance , uplift
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Dulaty University, Taraz, Kazakhstan
Dulaty University
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