The prediction of equivalent granular steady state line of loose sand with fines (2008)
Type of ContentJournal Article
PublisherUniversity of Canterbury. Civil and Natural Resources Engineering
Void ratio has been used as a state variable for predicting the liquefaction behaviour of soils under the Critical State, sometimes also referred to as the Steady State, framework. Recent publications show that void ratio may not be a good parameter for characterizing sand with fines because the Steady State Line (or curve) in the e-log(p') space moves downward with increase in fines content until a threshold value refers to as the threshold fines content “TFC”. Recently, an alternative state variable referred to as equivalent granular void ratio has been proposed to resolve this problem. To calculate this alternative state variable, an additional parameter “b” is needed. This parameter “b” represents the fraction of fines that actively participate in the force structure of the solid skeleton. However, predicting the “b” value is problematic. This paper examines the factors affecting the “b” value based on published work on binary packing. This leads to a simple semi-empirical equation for predicting the “b” value based on fines size and fines content. The proposed equations were evaluated with published data sets. Then, the concept of an equivalent granular steady state line is proposed. This concept was used to predict the location of SSLs for sand with different fines content from either the SSL of clean sand or the SSL of sand with a given fines content. The predictions agree well with experimental results.
CitationRahman, M.M., Lo, S.R. (2008) The prediction of equivalent granular steady state line of loose sand with fines. Geomechanics and Geoengineering, 3(3), pp. 179-190.
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Keywordsvoid ratio; state variable; steady state; liquefaction
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Rahman, M.M.; Lo, S.R.; Gnanendran, C.T. (University of Canterbury. Civil and Natural Resources Engineering, 2008)Void ratio has traditionally, been used as a state variable for predicting the liquefaction behaviour of soils under the Critical State Soil Mechanics framework. Recent publications show that void ratio may not be a good ...
Equivalent granular void ratio and state parameters for loose clean sand with small amount of fines Rahman, M.M.; Lo, S.R. (University of Canterbury. Civil and Natural Resources Engineering, 2007)Recent studies suggest that the undrained liquefaction behaviour of sand with finds is more complicated than clean sand, and their interpretation under Critical State Soil Mechanics (CSSM) is a challenge. It is also ...
Reply to the discussion by Wanatowski and Chu on "On equivalent granular void ratio and steady state behaviour of loose sand with fines" Rahman, M.M.; Lo, S.R.; Gnanendran, C.T. (University of Canterbury. Civil and Natural Resources Engineering, 2009)