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Block Vibration Test

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Block vibration test is used for evaluation of in situ dynamic and damping properties of soils. The test can beconducted on the foundation element to analyze of the response of the structure if the dynamic load is applied. The block vibration test is of two types: Vertical vibration test and Horizontal vibration test.
A mechanical oscillator is used as a source of the vibration. The acceleration pickup and the associated vibration meter is attached on top of the block. The block is subjected to vibrations and amplitudes were measured at different frequencies for each eccentric setting.Amplitude verses frequency curves are plotted and analysed for the given eccentricity to determine the natural frequency of the foundation soil system and damping. The eccentricity of the oscillator mass is modified to record the natural frequency of soil at different eccentricity.