Abstract

In this paper, a study has been carried out to estimate the ultimate capacities of concrete circular piles which are used as foundation type due to reasons such as poor ground conditions, seismicity, high or irregular loads etc. by field tests. Two cone penetration tests (CPTU), which measure the pore water pressures on alluvial soils of the Adapazarı plain, were conducted at the same locations with drillings which SPT tests were carried out. Ultimate capacities of a single pile with a specific geometry were determined by the methods proposed in the literature by using the data obtained from SPT and CPT field tests at both points. According to this, it is concluded that pile capacities can give very different results even in short distances in regions which offer sudden layer changes in horizontal and vertical. Disadvantages of the SPT test in practice compared to CPT have been shown to cause also different values of pile capacities.

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