Abstract
Results of pile'toe load tests are discussed for two cast-in-place concrete piles of $2500 and φ 1500 at the same site. Main conclusions are: 1) End bearing capacity decreases with pile diameter inversely. 2) The ultimate shaft resistance is ION/3 (kN/m^2) for sandy soil and cu for clayey soil, but is reduced by half after large uplift hysteretic displacement. 3) Estimated region as a pressure bulb at pile toe is like an apple shape with about two times of pile diameter in downward and about three times in radial direction. 4) Analysis used in this paper is effective for evaluation of end bearing capacity of large diameter piles.
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