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Effects of soil profile and characteristic of exciting force on propagation of ground vibrations

Journal of Modern Transportation 2012年第3期20卷 129-137页

作者： Sunao KUNIMATSU Yoshihiro HIRAO yasutoshi kitamura Institute for Geo-Resources and Environment National Institute of Advanced Industrial Science and Technology1-1-1 Higashi Tsukuba Ibaraki 305-8567 Japan Kobayashi Institute of Physical Research 3-20-41 Higashi-Motomachi Kokubunji Tokyo 185-0020 Japan Construction Engineering Research Institute Foundation 1-3-10 Turukabuto Nada-ku Kobe Hyogo 657-0011 Japan

Ground-borne vibrations caused by vibration sources such as road traffic and construction exhibit complicated properties during propagation from the vibration source to the inside of a building. In the present paper, a numerical analysis technique for the system of vibration source and propagation path of ground vibration is developed in order to systematically determine the propagation properties of the vibration as part of developing a predictive technique for exposure evaluations by vibrations in three directions at receiving points of vibration in the human body. First, the exciting forces in three directions for input into the numerical computation are inversely-estimated by using the measured acceleration rec- ords of the measurement points, which are near the vibration source. The thin-layered element method is used for numerical computation of the ground vibration. Then, the calculation results for the ground vibration obtained by using the estimated exciting force are compared with the measured results, and the influence of the stratified structure of the ground on the exciting force and the propagation properties of the ground vibration are studied. From these results, in a prediction of the ground vibration in three directions, it is emphasized that it is necessary to consider the influence of horizontal exciting force, although attention has been paid to only the vertical exciting force for simulating ground vibration.

关键词： ground-borne vibration vibration source exciting force stratified structure soil profile

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