Undrained Cyclic and Monotonic Strength of Sand-Silt Mixtures |
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Authors: | H K Dash T G Sitharam |
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Institution: | (1) Department of Civil Engineering, College of Engineering and Technology (CET), Biju Patnaik University of Technology (BPUT), Bhubaneswar, Orissa, 751 003, India;(2) Department of Civil Engineering, Indian Institute of Science, Bangalore, 560 012, India |
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Abstract: | In an attempt to correlate the monotonic peak strength and the cyclic strength of sand-silt mixtures over a wide range of
parameters and to clarify some of the existing confusing conclusions in the literature regarding the undrained strength response
of sand-silt mixtures, a series of stress controlled cyclic and strain controlled monotonic triaxial tests was carried out
on sand-silt mixture specimens of 50 mm diameter and 100 mm height with varying silt content. In these experiments, various
measures of sample density was adopted through different approaches such as constant gross void ratio approach, constant relative
density approach, constant sand skeleton void ratio approach, and constant interfine void ratio approach. Also the effect
of relative density and confining pressure on these strengths was studied. It is observed that the limiting fines content
and the relative density of a specimen play the key role in deciding the cyclic and monotonic resistance of sand-silt mixtures
when studied through any approach. For any silt content with relative density more than 70%, cyclic and monotonic resistances
are observed to be independent of silt content. When the undrained cyclic strengths of these specimens are plotted against
their respective undrained monotonic peak strengths, it is observed that there exists a definite exponential relationship
between the two with an excellent correlation coefficient. An expression is proposed in this regard to help engineers assess
the cyclic strength of sand-silt mixtures from monotonic test results. |
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