Evolution of the shear wave velocity during shaking modeled in centrifuge shaking table tests |
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| Authors: | Chung-Jung Lee Chung-Ru Wang Yui-Chen Wei Wen-Yi Hung |
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| Institution: | (1) Hanwha Engineering and Construction, Seoul, 100-797, Korea;(2) School of Civil, Environmental and Architectural Engineering, Korea University, Seoul, 136-713, Korea;(3) School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA 30331, USA; |
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| Abstract: | Two in-flight shear wave velocity measurement systems were developed to perform the subsurface exploration of shear wave velocity
in a centrifuge model. The bender elements test and the pre-shaking test used in the study provided reliable and consistent
shear wave velocity profiles along the model depth before and after shaking in the centrifuge shaking table tests. In addition,
the use of the bender elements measurement system particularly developed here allowed continuous examination of the evolution
of shear wave velocity not only during and after the shaking periods in the small shaking events but also during the dissipation
period of excess pore water pressure after liquefaction in the large shaking events. The test results showed that the shear
wave velocity at different values of excess pore water pressure ratio varied as the effective mean stress to the power of
0.27, to a first approximation. Consequently, a relationship between the shear wave velocity evolution ratio and the excess
pore water pressure ratio is proposed to evaluate the changes in shear wave velocity due to excess pore water generation and
dissipation during shaking events. This relation will assist engineers in determining the shear stiffness reduction ratio
at various ru levels when a sand deposit is subjected to different levels of earthquake shaking. |
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