To clarify the similarities and differences of properties of uplift and compression piles,the mobilizations of skin friction and tip resistance were analyzed based on destructive filed tests on two uplift piles and two compression piles.The destructive field test results showed that under a destructive load,there was a softening relationship between pile tip displacement and load.The average limit skin frictions of the uplift piles were about 0.373 to 0.763 times those of the compression piles,and larger va...