TY - GEN
T1 - Data processing of downhole records in embankment dams to extract insitu modulus reduction curves
AU - Kishida, T.
AU - Sousa, R. L.
AU - Byon, Y. J.
AU - Park, D. S.
AU - Armstrong, R.
N1 - Publisher Copyright:
© 2019 Associazione Geotecnica Italiana, Rome, Italy.
PY - 2019
Y1 - 2019
N2 - Dynamic properties of compacted earth core materials are difficult to measure in the laboratory because of sampling difficulties and the inclusion of larger-size particles. Significant uncertainties exist in selecting the modulus reduction curves of earth core materials in seismic design practice. This study reviews the acceleration time series recorded at multiple earthfill dams in Japan. The study describes the data processing methodology to extract the apparent shear wave velocities between downhole sensors during strong shaking by calculating the wave travel time. The study also describes the calculation of transient shear strains from the difference in displacement time series between sensors by double-integrating filtered acceleration time series. By combing these apparent shear wave velocities and shear strains between sensors, the insitu modulus reduction curves are extracted for earthfill central core materials for selected dams. The results are compared to the empirical models of modulus reduction curves for dam materials.
AB - Dynamic properties of compacted earth core materials are difficult to measure in the laboratory because of sampling difficulties and the inclusion of larger-size particles. Significant uncertainties exist in selecting the modulus reduction curves of earth core materials in seismic design practice. This study reviews the acceleration time series recorded at multiple earthfill dams in Japan. The study describes the data processing methodology to extract the apparent shear wave velocities between downhole sensors during strong shaking by calculating the wave travel time. The study also describes the calculation of transient shear strains from the difference in displacement time series between sensors by double-integrating filtered acceleration time series. By combing these apparent shear wave velocities and shear strains between sensors, the insitu modulus reduction curves are extracted for earthfill central core materials for selected dams. The results are compared to the empirical models of modulus reduction curves for dam materials.
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M3 - Conference contribution
AN - SCOPUS:85081169375
SN - 9780367143282
T3 - Earthquake Geotechnical Engineering for Protection and Development of Environment and Constructions- Proceedings of the 7th International Conference on Earthquake Geotechnical Engineering, 2019
SP - 3340
EP - 3345
BT - Earthquake Geotechnical Engineering for Protection and Development of Environment and Constructions- Proceedings of the 7th International Conference on Earthquake Geotechnical Engineering, 2019
A2 - Silvestri, Francesco
A2 - Moraci, Nicola
T2 - 7th International Conference on Earthquake Geotechnical Engineering, ICEGE 2019
Y2 - 17 January 2019 through 20 January 2019
ER -