Experimental Investigation on Liquefaction Resistance of Soil Mixtures Incorporating Intergrain Contact State
In order to investigate the liquefaction resistance CRR of fine-coarse mixtures, a series of undrained cyclic triaxial tests are performed on the mixtures with wide-range fines content FC and relative density Dr. Considering intergrain contact state, the mixtures are categorized as coarse-like soils, in-transition soils and fines-like soils. Skeleton void ratio esk is used as an alternative index to describe the force structure of the mixtures, and the parameters b and m are introduced to characterize the contribution of the fines and coarse grains fraction to the transition between coarse-like and fines-like behavior in the mixtures. The test results show that as FC increasing, the CRR of the mixtures with the same Dr decreases first, thereafter, it remains constant; in addition, the CRR of the mixtures with different FC and Dr decrease with the increase of esk. Moreover, by analyzing the test data obtained in this study, as well as the published results of liquefaction resistance for different kinds of soil mixtures, it is found that esk can be used as an index to uniquely evaluate the CRR of the mixtures, and a power relationship between CRR and esk is then obtained.
KeywordsFines-coarse mixtures Liquefaction resistance Intergrain contact state Fines content Skeleton void ratio
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