MEASUREMENT OF SOIL RESISTANCE FOR STEEL PIPE PILES DURING VIBRATORY HAMMER INSTALLATION

Abstract

 This paper evaluated the soil resistance during installation by a vibratory hammer. Steel pipe piles with a diameter of 1800 mm were constructed at Niigata airport signal bridge construction. During installation, dynamic measurements with axial strain and acceleration of the vibratory hammer body were performed. As the calculation method of the soil resistance for vibratory hammer installation, the singlemass model analysis method and the CASE method (Rausche et al., 1985) based on the one-dimensional wave theory were adopted. We attempted to separate the soil resistance into the shaft and the toe from the shape of the soil resistance – displacement curve. The calculated soil resistance curve trends were in good agreement with the N values in the ground survey results.