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National Information Service for Earthquake Engineering
University of California, Berkeley |
Site Liquefaction Investigation With the CSU Piezovane - Montery County, California.
Jeffrey P. Brislawn, Wayne A. Charlie & Donald O. Doehring, Colorado State University, Fort Collins, Colorado.
This report presents results fo the first field testing of the CSU Piezovane. Tests were conducted in saturated sediments along the Salinas and Pajaro rivers in Monterey County, California. The CSU Piezovane, a vane shear device equipped to measure pore pressure, identifies contractive soils that have the potential for liquefaction flow failure. Previous laboratory testing shows that the CSU Piezovane generates positive pore pressures in sands. The piezovane recorded pore pressure increases at sites that experienced lateral spreading during the 1989 Loma Prieta earthquake. The piezovane generated negative pore pressures in ground that did not have movement during the same earthquake. The validity of piezovane pore pressure is supported by liquefaction analyses of site geology and independent penetration testing.
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