Effects of Fines on Monotonic Undrained Shear Strength of Sandy Soils
Thevanayagam S, Ravishankar K, Mohan S
(Received 11 June 1996; accepted 8 July 1997)

Abstract
Shear strength of liquefied sands is an important component in seismic slope stability evaluation. Experimental data on a host sand mixed with different amounts of fines content and a careful analysis of other available steady state strength (S_us) data show that fines content and relative density play important roles affecting S_us. Fines content is found to be the major factor affecting S_us. When the S_us data for sands are grouped into (a) relatively clean sands (<12% fines), (b) silty sands (12 to 32% fines), and (c) silts or sandy silts (>50% fines) at the same relative density, relatively clean sands show the highest S_us. Silts show the lowest S_us. Silty sands show intermediate strengths. Based on this data, lower-bound relationships are proposed for S_us as a function of D_r and fines content.

Keywords:
fines content, liquefaction, relative density, residual strength, sand. silty sand. seismic stability, steady state strength

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Author Thevanayagam S, Ravishankar K, Mohan S Title Effects of Fines on Monotonic Undrained Shear Strength of Sandy Soils Symposium , Committee on