Abstract：At present，there are almost no reports on the field measurement of the prestressed high-strength concrete(PHC) pipe pile subjected to negative skin friction. To reveal the characteristics of negative skin friction on PHC pile piles，the measures of installation of and protection to the fiber Bragg grating sensors(FBG) on the PHC pipe piles were studied and the strains of 4 piles of a building foundation subjected to negative skin frictions induced by the recent soil filling were monitored for 21 months. The axial forces of the piles were deduced and their variation curves were plotted. The distribution and variation features of the axial forces of the piles under the loads from the superstructure and the negative skin frictions were analyzed. The measured values of the drag loads induced by the negative skin frictions on the PHC piles were notably greater than the values calculated according to the current Chinese code-Technical Code for Building Pile Foundation(JGJ94－2008)，indicating that the current theoretical method still needs to be improved. In the strata with non-uniformly distributed soft and stiff layers，the negative skin and positive skin frictions might occur alternately and how to consider this kind of circumstance in theoretical calculations is worth studying. The quality of and avoiding the construction damage to the asphalt coating are the key to ensure the effective reduction of the negative skin friction.
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2017, Vol. 36 
