Soil resistance of steel pipe piles during vibratory hammer installation

In this paper, we attempted to evaluate the soil resistance during the installation and the bearing capacity after curing time of the steel pipe piles by vibratory hammer installation. Four steel pipe piles with diameter of 114.3mm and length of 11m were constructed for the test. Three piles were installed by a vibratory hammer with different penetration rates. One pile was installed by a drop hammer. Dynamic measurement with axial pile head strain and acceleration were performed during installation. As the calculation method of the soil resistance for vibratory hammer installation, we adopted two methods, the single-mass model analysis method and the CASE method (Rausche et al., 1985) based on the one-dimensional wave theory. We attempted to separate the soil resistance into the shaft and the toe from the shape of the soil resistance – displacement curve. Static load tests were performed on all test piles with curing time of 1 day, 28 days and 180 days after installation