Abstract
Attenuation properties of subway-induced ground vibration were experimentally investigated to improve the accuracy of empirical prediction methods for the Vibration Level and bone noise level in buildings. Vibration accelerations both in the tunnels and on the ground were measured at 17 locations in and around the Tokyo area. This paper presents distributed levels of measured acceleration in the tunnels and ground. Dependency of attenuation properties on frequency is examined, and internal damping in every 1/3 octave band are calculated based on the Bornitz formula. Variations of internal damping and damping factors with ground conditions are discussed, and also variations of Vibration Level are estimated.
