Nonlinear behaviour of scoria soil sediments evaluated from borehole records in eastern Shizuoka prefecture, Japan
✍ Scribed by Satoh, Toshimi; Horike, Masanori; Takeuchi, Yoshihiro; Uetake, Tomiichi; Suzuki, Hideyo
- Book ID
- 101220026
- Publisher
- John Wiley and Sons
- Year
- 1997
- Tongue
- English
- Weight
- 367 KB
- Volume
- 26
- Category
- Article
- ISSN
- 0098-8847
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✦ Synopsis
We evaluate the non-linear behaviour of soil sediments, analysing five weak and four strong motions observed at depths of 1 m and 28 m, in eastern Shizuoka prefecture, Japan. We identify S-wave velocities and frequency-dependent damping factors by minimizing the residual between observed and theoretical spectral ratios, based on a linear one-dimensional model. We find that S-wave velocities identified from strong motions, whose peak ground acceleration are 440, 210, 176, and 140 cm/s, are significantly smaller than those identified from weak motions. The shear modulus reduction ratios estimated from identified S-wave velocities become clear above an effective shear strain of 10\ and agree with laboratory test results below an effective shear strain of 8;10. The differences of damping factors between weak and strong motions are not clear below this effective shear strain, as the laboratory test suggested. The equivalent linear one-dimensional model, with frequency-dependent damping factors, is confirmed to be valid to simulate strong motions at least an effective shear strain of less than 4;10.