Özet:

Environmental vibrations generated by vehicle traffic, rail transition, pile driving, explosion, construction and machine can affect human being’s life and work, destroy building structures and influence instrumentation equipment service life and performance. The active vibration isolation mechanism was given and the range of the isolator parameters are discussed that can obtain the ideal vibration isolation effects. One bearing platform has been designed with active vibration isolation system, the frequency of the ground floor and bearing platform are 4.5 Hz and 7.5-11.5 Hz, and the parameters of the isolators and calculated isolation coefficient all meet with the specifications, but the resonances of the bearing platform caused by the environmental vibrations still take place. The geotechnical conditions under the bearing platform reveal that the water table is about 4.0 m and silt clay with 4.6 m thick exists at the position of 5.7 m from the ground surface, and so the upper soils can easily transmit vibrations and cause the resonances. The soft soils were reinforced with concrete piles and the whole stiffness of the soils was enlarged, and the resonances are thoroughly eliminated, which provides some references for the vibration isolation design at the fields with high water table and soft soils.

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