Abstract
The results of 3 vertical loading tests on large diameter steel pipe piles with slip layers on pile surface to reduce negative skin friction are reported. The dimension of piles, location of strain gages and soil profiles are shown in Fig.2, 9 and 16. The bearing capacities of piles are dicided from the results of tests as Table 3. The behavior of friction stress τ_<SL> (on pile surface with slip layers) and τ_O (with non-slip layers) are expressed in Fig.24 and 25.Fig.29 is the relationship between pile tip resistance R_p and settlement S_p, and mesured ultimate values of R_p are compared with calculated values.
