Non-linearity of gravelly soils under seismic compressional deformation based on KiK-net downhole array observations
File(s)
Accepted version
Published version
Author(s)
Han, B
Yang, Z
Zdravkovic, L
Kontoe, S
Type
Journal Article
Abstract
In this paper the nonlinear behaviour of gravelly soils under seismic
compressional deformation is investigated based on KiK-net downhole array earthquake
observations in Japan. By comparing the amplification spectra between the vertical
response at the ground surface and at the bottom of downholes subjected to strong
motions with those subjected to weak motions, empirical curves for constrained
modulus degradation are obtained considering different levels of vertical confining
pressure. Results show that the nonlinearity associated with the compressional
deformation can be as significant as that of the shear deformation, for gravelly soils
above water tables. The proposed curves provide satisfactory predictions for the
compressional soil nonlinearity investigated in previous studies. Furthermore, the
proposed curves are formulated by a modified cyclic nonlinear model, which can
account for constrained modulus degradation under a variety of confining pressure
conditions and therefore extends the application of the proposed reference curves to
nonlinear numerical analysis of geotechnical structures under multi-directional seismic
loads.
compressional deformation is investigated based on KiK-net downhole array earthquake
observations in Japan. By comparing the amplification spectra between the vertical
response at the ground surface and at the bottom of downholes subjected to strong
motions with those subjected to weak motions, empirical curves for constrained
modulus degradation are obtained considering different levels of vertical confining
pressure. Results show that the nonlinearity associated with the compressional
deformation can be as significant as that of the shear deformation, for gravelly soils
above water tables. The proposed curves provide satisfactory predictions for the
compressional soil nonlinearity investigated in previous studies. Furthermore, the
proposed curves are formulated by a modified cyclic nonlinear model, which can
account for constrained modulus degradation under a variety of confining pressure
conditions and therefore extends the application of the proposed reference curves to
nonlinear numerical analysis of geotechnical structures under multi-directional seismic
loads.
Date Issued
2015-12-04
Date Acceptance
2015-11-03
Citation
Geotechnique Letters, 2015, 5 (4), pp.287-293
ISSN
2045-2543
Publisher
Thomas Telford (ICE Publishing)
Start Page
287
End Page
293
Journal / Book Title
Geotechnique Letters
Volume
5
Issue
4
Copyright Statement
© 2015 Thomas Telford Ltd. Original article available at [enter journal website]. Permission is granted by ICE Publishing to print one copy for personal use. Any other use of these PDF files is subject to reprint fees.
Publication Status
Published