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Proceedings of the 18
th
International Conference on Soil Mechanics and Geotechnical Engineering, Paris 2013
able to capture reasonable well the shear wave velocity profile,
even when it decreases with depth.
Vs30 obtained through SASW gives an error in the order of
15% compared to the one obtained through the Downhole
technique.
The SASW method requires qualified and trained
professionals, so they can be able to make a good interpretation
of the recorded data and to obtain a reasonable dispersion curve.
This is even more critical when the shear wave velocity
decreases at a certain depth.
It is recommended to have stratigraphic information of the
area in order to reduce even higher errors, associated with this
methodology.
In soils with a shear wave velocity profile that does not
increases monotonically with depth the acceleration response
spectrum presents more than one peak, which should be
incorporated in the design spectrum with a wider plateau to
cover all the peaks.
A very good correlation was observed in the Santiago basin
between the Vs30 and the pseudo acceleration, with the pseudo
acceleration decreasing with an increment in the Vs30. This
result would tend to support the use of Vs30 as a parameter for
soil classification when the stiffness of the soil increases with
depth.
However, no unique correlation was observed in all the sites
between the Vs30 and the pseudo acceleration, which implies
that this parameter is not sufficient by itself to seismically
classify all the soils, in particular if they have different
geological formations
6 REFERENCES.
Peredo V. 2011. Aplicación del método SASW en suelos. Memoria para
optar al título de Ingeniera Civil, Facultad de Ciencias Físicas y
Matemáticas, Universidad de Chile.
Pinilla C. 2012. Correlación entre el perfíl de velocidad de propagación
de ondas de corte y el espectro de respuesta en suelos. Memoria
para optar al título de Ingeniero Civil, Facultad de Ciencias Físicas
y Matemáticas, Universidad de Chile.
Boroschek R. 2010. Registros del terremoto del Maule Mw=8.8 27
Febrero de 2010, RENADIC.
