Study of Dynamic Properties of Soil Mixtures
Date Issued
2015
Date
2015
Author(s)
Kao, Yu-Hao
Abstract
Maximum shear modulus of soil is an important dynamic soil property which can be affected by many factors, such as relative density, mean effective stress, plasticity index, fines content, over-consolidation ratio, etc. In this research, a series of bender element tests are performed to estimate the shear wave velocities and hence the maximum shear moduli of soil mixtures. There are two soil mixtures considered in this study. They are soil mixtures composed of 20% Kaolin clay with 80% Silica sand and 40% Kaolin clay with 60% Silica sand. In addition, effect of consolidation stress and plasticity index on maximum shear modulus is explored in this study. Based on the laboratory results, maximum shear moduli of soil mixtures are found to be increasing with increasing consolidation stress. On the other hand, the impact of over-consolidation ratio on maximum shear modulus is different for different values of plasticity index. When plasticity index is low, the influence of over-consolidation on maximum shear modulus is little. However, when plasticity index is high, maximum shear modulus would increase with increasing over-consolidation ratio. In this research, performance of empirical models of maximum shear modulus, which are previously developed by other researchers, is studied. Using the laboratory data from current study and those from other researchers, differences between the data and predictions (from empirical models) are evaluated. In addition, a linear regression model is developed in this study to correlate the maximum shear modulus of soil mixtures with other soil parameters.
Subjects
maximum shear modulus
shear wave velocity
bender element
soil mixtures
Type
thesis
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