An Electro-Vibrocone for Evaluation of Soil Liquefaction Potential

 by Alec McGillivray1, Thomas Casey1, Paul W. Mayne2, and James A. Schneider3

Keywords:  cyclic loading, cone penetration test, earthquakes, in-situ testing, liquefaction, piezocone, porewater pressures, vibrocone


   An electric downhole vibrocone has been designed for the site-specific evaluation of soil liquefaction susceptibility in high seismicity regions. The device induces localized cyclic pore pressures while concurrently measuring dynamic tip and friction resistances. The latest design couples a dual-element penetrometer with a piezo-actuator shaker.  This vibrocone offers a number of advantages over its predecessors including downhole vertical oscillation, adjustable dynamic force and frequency of excitation, and the simultaneous measurement of porewater pressures at multiple positions.

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