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Effects of specimen geometry and loading rate on compressive strength of unstable compacted soil block

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Document pages: 10 pages

Abstract: Loading rate and specimen geometry are key parameters for simple compression test to determine the strength of soil materials. In this study, cubic and cylindrical unstable compacted soil blocks with different sizes were made, and unconfined compression tests were carried out to study the effects of size and shape on the compressive strength of soil materials under different loading rates. The correlation between the compressive strength of soil and the geometric parameters of the sample is determined. The recommended loading rate and samples for soil compressive strength test are given. Finally, a constitutive model describing the stress-strain response of soil materials is proposed. The model corrects the defects of the constitutive equationations suggested in previous studies and may be applied to the numerical analysis of earth structure.

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