Dynamic foundation is widely used in modern industry, and it can produce vibration influence on the surrounding environment in its operation process. Through constructing a large model slot indoor, 16 foundations with different shapes and materials were poured. Then dynamic parameters of sand soil were measured with a bender-extender element test. Vibration tests for a single foundation and two adjacent foundations under conditions of different shapes, stiffnesses and buried depths were conducted, respectively. Their vibration propagation features and law were analyzed. The test results were compared with those in existing literatures. The results showed that the wave form and frequency of vibration sources obviously affect foundation vibration; vibration velocity amplitude of soil for a strip foundation is the maximum, that for a square one is the second large, and that for a cylinder one is the smallest; the vertical vibration velocity amplitude of measured points in soil decreases with increase in stiffness and height of foundations and decrease in buried depth of foundations; the vibration velocity amplitude of measured points in soil decreases with increase in the distance between two adjacent foundation centers; compared with a single foundation vibration, the overall attenuation characteristic of sand layer vibration velocity amplitude when two foundations interact is similar to the vibration velocity amplitude attenuation feature at the point on the single foundation with a certain distance from vibration source. The results provided a reference for the optimization design of dynamic foundations and the vibration protection of surrounding environment.
Key words
foundation /
vibration /
bender-extender element /
model test /
propagation law
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