A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Effect of Discrete Columns on Shear Stress Distribution in Liquefiable Soil
Stone and soil-cement columns are often used to improve the liquefaction resistance of loose sandy ground potentially subjected to strong shaking. The shear stress reduction in the loose ground resulting from the reinforcing effect of these stiffer discrete columns is often considered as a contributing mechanism for liquefaction mitigation. Current design practice commonly assumes that discrete columns and soil deform equally in pure shear (i.e. shear strain compatible deformation). In addition, since the discrete column is stiffer than the soil, it is assumed to attract higher shear stress, thereby reducing the shear stress in the surrounding soil. In this paper, the shear stress distribution mechanism of discrete columns and the shear stress reduction in liquefiable soils are investigated using 3-D finite element analysis. From the analysis, it is found that discrete columns behave in both shear and flexure, such that the shear strain compatibility assumption can be significantly unconservative. The investigation indicates that the shear reinforcement of stiffer discrete columns is less effective than commonly used in current design practice. A revised design equation is proposed to conservatively estimate the shear stress reduction ratio.
Effect of Discrete Columns on Shear Stress Distribution in Liquefiable Soil
Stone and soil-cement columns are often used to improve the liquefaction resistance of loose sandy ground potentially subjected to strong shaking. The shear stress reduction in the loose ground resulting from the reinforcing effect of these stiffer discrete columns is often considered as a contributing mechanism for liquefaction mitigation. Current design practice commonly assumes that discrete columns and soil deform equally in pure shear (i.e. shear strain compatible deformation). In addition, since the discrete column is stiffer than the soil, it is assumed to attract higher shear stress, thereby reducing the shear stress in the surrounding soil. In this paper, the shear stress distribution mechanism of discrete columns and the shear stress reduction in liquefiable soils are investigated using 3-D finite element analysis. From the analysis, it is found that discrete columns behave in both shear and flexure, such that the shear strain compatibility assumption can be significantly unconservative. The investigation indicates that the shear reinforcement of stiffer discrete columns is less effective than commonly used in current design practice. A revised design equation is proposed to conservatively estimate the shear stress reduction ratio.
Effect of Discrete Columns on Shear Stress Distribution in Liquefiable Soil
Rayamajhi, D. (author) / Nguyen, T. V. (author) / Ashford, S. A. (author) / Boulanger, R. W. (author) / Lu, J. (author) / Elgamal, A. (author) / Shao, L. (author)
GeoCongress 2012 ; 2012 ; Oakland, California, United States
GeoCongress 2012 ; 1908-1917
2012-03-29
Conference paper
Electronic Resource
English
Effect of Discrete Columns on Shear Stress Distribution in Liquefiable Soil
| British Library Conference Proceedings | 2012
Numerical Study of Shear Stress Distribution for Discrete Columns in Liquefiable Soils
| British Library Online Contents | 2014
Effect of DSM Grids on Shear Stress Distribution in Liquefiable Soil
| British Library Conference Proceedings | 2012