Chapter
Jun 20, 2012
Numerical Modeling of the Seismic Response of Columnar Reinforced Ground
Authors: C. Guney Olgun [email protected] and James R. Martin, II [email protected]Author Affiliations
Publication: Geotechnical Earthquake Engineering and Soil Dynamics IV
Abstract
Ground improvement using stiff columnar reinforcement, such as stone, jet-grout, and soil-mix columns, is commonly used for mitigation of seismic damage in weak ground. Seismic shear stress reduction in the reinforced soil mass is often counted on for reducing liquefaction potential. Current design methods assume composite behavior of the reinforced soil, where the shear stress reduction is based on the ratio of the columnar stiffness relative to the soil as well as the area, replacement ratio. This implicitly assumes the stiff columns will deform in pure shear along with the soil. We performed 3-D dynamic finite element modeling to better understand the column deformation and shear stress reduction behavior. We found that the columns deform in both shear and flexure, providing little seismic shear stress reduction and current methods may be unconservative.
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Copyright
© 2008 American Society of Civil Engineers.
History
Published online: Jun 20, 2012
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ASCE Technical Topics:
- Continuum mechanics
- Deformation (mechanics)
- Earthquake engineering
- Engineering fundamentals
- Engineering mechanics
- Geomechanics
- Geotechnical engineering
- Models (by type)
- Numerical models
- Seismic effects
- Seismic tests
- Shear deformation
- Shear stress
- Soil dynamics
- Soil mechanics
- Soil properties
- Soil stabilization
- Soil stress
- Solid mechanics
- Stress (by type)
- Structural analysis
- Structural engineering
- Structural mechanics
- Tests (by type)
Authors
Affiliations
Research Scientist, Via Department of Civil and Environmental Engineering, Virginia Tech, 111 Patton Hall, Blacksburg, VA 24061. E-mail: [email protected]
Professor, Via Department of Civil and Environmental Engineering, Virginia Tech, 111-B Patton Hall, Blacksburg, VA 24061. E-mail: [email protected]
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