Correlation between Critical State Soil Parameters and Index Properties of Remolded Red Clay Soils of Addis Ababa
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Date
2012-07
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Addis Ababa University
Abstract
Critical state concept is a modern concept to make estimates of soil responses when one cannot conduct sufficient soil tests to completely characterize a soil at a site or when one needs to predict the soil’s response from changes in loading during and after construction. In this study correlations are developed to predict critical state soil parameters (CSSP) from index tests so that one can be able to model Addis Ababa red clay soils with critical state model using simple laboratory tests.
Disturbed soil samples from six different sites of Addis Ababa, where red clay is found, are collected. Laboratory tests like specific gravity, grain size analysis, Atterberge limit and standard compaction for a total of twelve test samples (at 1.5m and 3.0m depths per each six sites) are conducted. By remolding these samples to MDD and OMC Twelve - one dimensional consolidation and six- isotropic consolidation triaxial tests have done. From these tests critical state soil parameters (λ and Γ) are determined. From the results of limited tests, an indicative good correlation is observed between (Γ and LL), (Γ and, PL), (Γ and PI), (λ and LL) and (λ and PL). But, Poor correlation is developed between λ and PI.
The developed correlations will be important inputs in modeling Addis Ababa red clay soils with critical state model using simple index tests. In addition, the results of this study can serve as a basis for further study of such correlations on red clay soils in the country.
Key words: critical state soil parameters (CSSP), index property, standard compaction
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Keywords
critical state soil parameters (CSSP); index property; standard compaction