強制外カによる地盤・構造物の振動・騒音(II) : N値と地盤振動について

This paper deals with the acceleration behaviour of the vibrations on the ground surface and the foundation of structures caused by pile driving of a steel pile(diameter : 508mm, thickness : 6.4mm) to the depth of 50 m underground.
For the measurements acceleration transducers, a dynamic strain meter and a electromagnetic oscillograph were used. Moreover, the acceleration behaviour on the ground surface caused by passing motorcars and by operating forging machines was measured. We haye some discussions about the relation between the observed records and the N-values of soils at the measuring site.