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- Title
Development of global correlation models between in situ stress-normalized shear wave velocity and soil unit weight for plastic soils.
- Authors
Moon, Sung-Woo; Ku, Taeseo
- Abstract
Shear wave velocity ( Vs) in geo-materials is strongly dependent on factors such as stress state, void ratio, and soil structure. Stress-dependency and void-ratio dependency can be represented by the equations and Vs = a( e) b (where α and a are material constants; exponents β and b represent the sensitivity of stress and the void dependent effect, respectively; is effective confining stress; e is void ratio), respectively. To consider the effect of soil disturbance and stress relief in geo-materials, shear wave velocity is often required to be normalized by adopting the site-specific model parameters ( β or b). Based on a special in situ database compiled from 156 well-documented test sites that include various geo-materials, this study presents ( i) the apparent relationships of the model parameters α and β for all soil and rock materials as well as a and b for all soil materials, ( ii) new global correlations between soil unit weight and two types of stress-normalized shear wave velocities ( Vs1 and Vsn), instead of the conventional Vs - soil unit weight relationship for clays, and ( iii) the best-fitted multi-regression models between soil unit weight and site-specifically normalized shear wave velocity as well as the plasticity index for plastic soils. Moreover, this study presents the importance of site-specific stress normalization ( Vsn) in creating a better correlation model. The proposed relationships offer first-order assessments of soil unit weight within the ranges of available data, which are also approximately guided by a hyperbolic unit weight model with depth.
- Subjects
PLASTIC properties of soils; SHEAR waves; STATISTICAL correlation; SOIL structure; MULTIPLE regression analysis; DEAD loads (Mechanics); DYNAMIC loads
- Publication
Canadian Geotechnical Journal, 2016, Vol 53, Issue 10, p1600
- ISSN
0008-3674
- Publication type
Article
- DOI
10.1139/cgj-2016-0015