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Experiment on the Negative Friction of Single Pile under Self-weight Consolidation for the Dredger Fill

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DOI: 10.23977/csic.2018.0912

Author(s)

Ping Yang, Shoubao Xue, And Yaohui Liu

Corresponding Author

Yaohui Liu

ABSTRACT

The objective of this paper is to analyze the negative friction of pile caused by the self-weight consolidation of dredger fill. It is difficult for routine test to meet the time requirement of self-weight consolidation of soil. However, the centrifugal test model adopted the scale-shrink effect and the model satisfied the requirement of pile-soil consolidation in a short time. Thus the self-weight consolidation of the dredger fill at the upper part of the single pole foundation in the soft soil was simulated by the centrifugal model test. The result of the experiment showed that when the self-weight consolidation of dredger fill sustained for 2.5, 20, 50 months, the negative friction was 85.6%, 52.67%, 20.65% of the pile top load. The negative friction disappeared when the self-weight consolidation sustained for 75 months. The relationship between pile-soil settlement and time corresponds with the Hill Model. It is feasible to forecast the pile-soil settlement of the self-weight consolidation of stacking dredger fill through the Hill Model.

KEYWORDS

Dredger Fill, Pile, Negative Friction, Centrifugal Model Test, Self-Weight Consolidation

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