DING Jihui , WANG Weiyu, ZHAO Tuo, FENG Junhi , QUAN Xiaojuan
Blasting are adopted to simulate the natural earthquake, through the field test of composite foundation and natural foundation, dynamic characteristics and attenuation law are studied. The experiment results show, the horizontal main vibration frequency of natural foundation is at 8.2 ~ 9.03 Hz and the vertical is at 7.75 ~ 9.16 Hz; the horizontal main vibration frequency of composite foundation is at 8.02 ~ 9.90 Hz and the vertical is at 8.36 ~ 9.70 Hz. Measuring point frequency of natural foundation and composite foundation is near to the first-order natural frequency. Effects of the implanting pile in the natural foundation are little on the frequency. Vibration attenuation of acceleration peak in the natural foundation and composite foundation is fitted in exponential attenuation, the attenuation rate in composite foundation is faster than natural foundation, and then composite foundation is good for the anti-seismic of the upper structure.
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