Research-to-Practice Webinar, Feb 21: Centrifuge Tests, Numerical Analyses, and Design Practices

[announce at designsafe-ci.org]

SEISMIC RESPONSE OF AN EMBANKMENT ON LOOSE SATURATED SAND TREATED WITH
SOIL-CEMENT PANELS: CENTRIFUGE TESTS, NUMERICAL ANALYSES, & DESIGN PRACTICESNCO
WEBINAR SERIES: NHERI RESEARCH TO PRACTICE
FEBRUARY 21, 2018 | 10AM - 11AM PDT
The webinar is free. Click here
<https://www.designsafe-ci.org/learning-center/training/webinars/research-practice/2018/0221/>
 to register at the DesignSafe-CI website.Presenter


*Ross W. Boulanger, PhD, PE, NAEModerator: Mohammad Khosravi, PhD*

Professor Ross W. Boulanger is the Director of the Center for Geotechnical
Modeling in the Department of Civil and Environmental Engineering at the
University of California, Davis. He received his PhD and MS degrees in
Civil Engineering from the University of California at Berkeley, and his
BASc degree in Civil Engineering from the University of British Columbia.
His research and professional practice are primarily related to
liquefaction and its remediation, seismic performance of dams and levees,
and seismic soil-pile-structure interaction. His honors include the TK
Hsieh Award from the Institution of Civil Engineers, the Ralph B. Peck
Award, Norman Medal, Walter L. Huber Civil Engineering Research Prize, and
Arthur Casagrande Professional Development Award from the American Society
of Civil Engineers (ASCE), and election to the National Academy of
Engineering in 2017.
Presentation Abstract

Numerical simulations of a centrifuge model test of an embankment on a
liquefiable foundation layer treated with soil-cement panels is used to
evaluate key aspects of common design practices. The centrifuge model
approximates a configuration that has been used for liquefaction
remediation at several dams, and the numerical analyses evaluate common
approximations used in the design of some of these projects. The centrifuge
model was tested on a 9-m radius centrifuge and corresponded to a 28 m tall
embankment underlain by a 9 m thick saturated loose sand layer. Soil-cement
walls were constructed through the loose sand layer over a 30 m long
section near the toe of the embankment and covered with a 7.5 m tall berm.

The model was shaken three separate times using an earthquake motion scaled
to peak horizontal base accelerations of 0.05 g, 0.26 g, and 0.54 g. The
latter two events caused liquefaction in the loose sand layer. Crack
detectors indicated that the soil-cement walls sheared through their full
length in the third event. Two-dimensional nonlinear dynamic analyses using
FLAC were performed using equivalent composite properties for the
soil-cement treatment zone and the constitutive model PM4Sand for the
embankment and foundation soils.

The results of the centrifuge model test and two-dimensional nonlinear
dynamic simulations are compared. Capabilities and limitations in the
two-dimensional simulations of soil-cement grid reinforcement systems, with
both liquefaction and soil-cement cracking effects, are discussed.
Implications for practice are discussed.

*Sponsored by: University of California at Davis, Center for Geotechnical
Modeling*
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