Experimental Study on The Influence of Precision Instruments Caused by Heavy Vehicles Vibration

In order to evaluate the influence of heavy vehicles vibration on precision instruments in a proposed experimental building, the three-dimensional environmental vibration induced by heavy vehicles was measured in a soft soil site. Combined with continuous wavelet transform and 1/3 octave frequency vibration level, the vibration transferring characteristics of the construction site were analyzed, and the Z vibration level of the site was tested. The results are as follows: (1) Vertical vibration is the main vibration; (2) The predominant frequency of soil layer is 4 Hz, and the excitation frequency of vehicles is 5 ~ 20 Hz; (3) With the increase of vibration source distance, the high frequency vibration is greatly attenuated, while the low frequency vibration is amplified; (4) The amplitude of heavy vehicles is about 3 ~ 5 times of the small cars; (5) The environmental vibration produced by the vehicles exceeds the vibration standard of the normal use of the instruments, necessary vibration reduction and isolation measures should be taken.