交通機関が地盤の振動特性に及ぼす影響

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Simultaneous observation of short-period seismic noise were carried out on the observation points where the distances from the national road and the expresshig highway in Morioka area. Investigation was like-wise conducted with respect to the ground vibration characteristics excited by the cars and vehicles and their influential range. On the other hand, the investigation was also made to see whether directly-generated noise by vehicular traffic was included in the redults of short-period seismic noise observation, approximately 490 points in Morioka area. Short-period, seismic noise was measured by 3-component seismometers with a natural period of 1see.Power spectra were calculated by means of FFT from 2048 degitized data of wave forms.Results of the investigation are summarized as follows: 1) Due to passage of cars and vehicles, ground vibration in the frequency band between 5Hz and 15 HZ is much exicited and its directly-generated influence is exercised upon a range no less than 300 m from the road. 2) Amplitude and predominant frequency of the short-period seismic noise while none of cars and vehicles pass through make no change in accordance with the distance from the road. 3) With respect to the amplitude of the short-period seismic noise observed in Morioka area at midnight especially while none of cars and vehicles pass through, none of significant difference is seen in either the district close to the road with in 200 m from the trunk-line road where huge traffic volume or the regionexcluding the said district. Therefore it is suggested that vibration characteristics of the ground peculiar to the site can be observed even in the vicinity of trunk-line road, provided that passage of cars and vehicles is ceased for a settled time required for andysis.

交通機関が地盤の振動特性に及ぼす影響

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