Study of calculation of negative skin friction on piles in high filled embankment after dynamic compaction considering consolidation effect
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Abstract:
The paper put forward the method of calculating the values of negative skin friction with the consolidation time on piles based on the field tests on high filled embankment after dynamic compaction. The proposed method calculate the values of skin friction respectively according to the improvement depths by dynamic compaction and non-improvement depths, using Terzaghi consolidation theory to calculate soil settlements to reflect the influence of consolidation effects on skin friction, using interference shear tests with soil and concret to get load transfer function between soil and piles to reflect the influence of relative deformation, and calculating the values of negative skin friction by finite difference method. Based on the comparative analyses of the results of the calculation and field testing, it is proved that the changing tendency of negative skin friction with depth by the calculation corresponds with that by field testing. The values of negative skin frication by field testing are about 0.5 of theoretical values by the calculation, and it is advisable to multiply the latter by a reduction coefficient of 0.5 when using them in projects.
