SD-Lecture13-Measuring-Vibrations

SD-Lecture13-Measuring-Vibrations - CEG CEG-5065C Soil...

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Unformatted text preview: CEG CEG-5065C Soil Dynamics 5065C Soil Dynamics Lecture 13 Lecture 13 easuring Vibrations Measuring Vibrations Luis A. Prieto-Portar 2009 Vibrating Machines: rotating mass type of excitation. Not all vibrations are bad. Some machines have been intentionally designed with eccentric weights that shake their frames in a forceful manner. For example, steel sheet-piling vibrating machines use this principle, along with the application of water pressure, in order to create a liquefaction condition in the soil and thereby easily place these sheet-piles to great depths. A simple diagram of this type is shown below. A rotating mass excitation of a foundation-soil system. A vibratory sheet-pile driving machine is commencing to place the steel casing of a drilled shaft. Notice the two counter- rotating masses on its wer part of the lower part of the vibrating machine. Vibratory hammer driving a timber pile. Note the opposite rotating shafts on the driver. A vibro-flotation machine. This device is used to liquefy granular soils and thereby densify a column of this soil. It is used for soil improvement. The vibro-flotation probe has two concentrically rotating masses within its shaft, to generate large vertical vibrations. ( ) ( ) ( ) ( ) 2 2 2 2 2 1 2 2 2 2 2 2 The differential equation of motion is, where 2 The solution maybe of the form,...
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SD-Lecture13-Measuring-Vibrations - CEG CEG-5065C Soil...

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