ANALYSIS OF VERTICAL COMPRESSIVE BEARING BEHAVIOR OF ULTRA LONG PHC PILES
The vertical compressive bearing characteristics of ultra-long PHC pipe piles are studied through a three-dimensional finite element model of six single pile vertical compressive static load tests. By changing the pile length, the changes in the vertical compressive bearing characteristics of single piles are explored. The results indi-cate that the Q-s curve of the end bearing friction type ultra long pile shows a gradual change when loaded within the designed maximum test load, and there is no characteristic point of sudden failure. When determining the ulti-mate compressive bearing capacity of a single pile using pile top displacement control, it is necessary to consider de-ducting the compression amount of the pile body, and the compression amount of the pile body cannot be ignored. The vertical displacement of the super long pile body shows a distribution of larger in the upper part and smaller in the lower part, while the vertical displacement difference at each depth of the short pile body is small. The lateral friction resistance around the upper part of an ultra long pile is first exerted, followed by the lower part, showing a gradual development from top to bottom, while the lateral friction resistance around the pile of a short pile is basical-ly synchronized. The attenuation rate of axial force along the depth of short piles is not significantly different, while the attenuation of axial force of ultra long piles is mainly concentrated in the upper part of the pile.
extra-long PHC pipevertical compressive bearing characteristics of single pilerlateral frictional resistance around the pile
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维普
