Abstract
Monotonic and cyclic direct simple shear tests with shear wave velocity measurements were conducted on a series of silica sand gradations to examine the effect of both fines content and grain size distribution. Two test series were considered, one with parallel gradations with decreasing D50 and constant Cc, Cu values (N-series), and a second one where Cc was kept constant and Cu, D50 values varied (W-series). In both series, the fines content varied from 0 to 50%. The most dramatic effects were noted for the clean sands as the Cu value increased and for the silty sands as fines content increased from 1 to 50%. In general, static and dynamic behavior was observed to depend on the amount of fines, Cu and D50 values. The same was true for pre-cycling and post liquefaction shear wave velocities. Post-liquefaction shear wave velocities were on the order of 8–13% of the pre-cycling values.
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Abbreviations
- C c :
-
Coefficient of curvature
- C u :
-
Coefficient of uniformity
- D 10 :
-
Grain size in which 10% of soil pass (mm)
- D 30 :
-
Grain size in which 30% of soil pass (mm)
- D 50 :
-
Grain size in which 50% of soil pass (mm)
- D 60 :
-
Grain size in which 60% of soil pass (mm)
- CSR :
-
Cyclic stress ratio
- \(\sigma_{axial - initial}^{\prime }\) :
-
Initial normal stress (kPa)
- \(\sigma_{axial}^{\prime }\) :
-
Normal stress (kPa)
- τ cyclic :
-
One-directional cyclic shear stress amplitude (kPa)
- u r :
-
Pore pressure ratio
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Doygun, O., Brandes, H.G. & Roy, T.T. Effect of Gradation and Non-plastic Fines on Monotonic and Cyclic Simple Shear Strength of Silica Sand. Geotech Geol Eng 37, 3221–3240 (2019). https://doi.org/10.1007/s10706-019-00838-9
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DOI: https://doi.org/10.1007/s10706-019-00838-9