Modelling of Maximum and Minimum Void Ratio for Sand-Silt Mixtures
Date Issued
2015
Date
2015
Author(s)
Wang, Jia-Yi
Abstract
Minimum or maximum void ratio is an important soil property in geotechnical engineering. It correlates to the volume change tendency, the pore fluid conductivity and the shear strength of the soil. However, it is commonly troublesome to acquire minimum and maximum void ratio by experiments. The minimum and maximum void ratio for soil mixtures are usually estimated by methods based on, to some extent, the empirical approach, for example the AASHTO coarse particles correction method. In this thesis, a mathematical model is developed to predict the minimum and maximum void ratio for sand-silt mixtures with any amount of fines content based on a more fundamental approach. Taking the dominant particle network into consideration, the model is further improved by two coefficients which describe the sizes and shapes of two component particles in sand-silt mixtures. The model is evaluated by the experiment results of minimum and maximum void ratio on about 30 types of soil mixtures of sands (Ottawa sand, Nevada sand, Toyoura sand, Hokksund sand, etc.), and silts (ATC silt, Nevada fines, crushed silica fines, grind Toyoura fines, etc.) available in the literature. Comparison between the model and the experiment results is presented and discussed.
Subjects
maximum void ratio
minimum void ratio
sand-silt mixtures
fines content
Type
thesis
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