Abstract
Shear wave method has been increasingly popular in assessing the liquefaction potential of granular soils. Two particle-scale parameters, the inter-particle friction and the shear modulus of grains, play vital roles in correlation between Cyclic Resistance Ratio (CRR ) and shear wave velocity corrected by overburden stress (Vs1 ). Series of drained one-dimensional compression tests were simulated on samples of different inter-particle friction angles assigned during preparation stage. Uniformity coefficients of these Particle Size Distribution (PSD) curves are 2 and 4 whose average particle size d 50 are identical. The shearing results, as well as their assigned inter-particle friction angles form calibration curves for real sands. Dissimilar PSD curves result in different calibration outcomes. For Silica sand no.8, these curves give divergent inter-particle friction angles. This study calibrates particle shear modulus for Silica sand no.8 as well. Different PSD curves give divergent values of particle shear modulus. PSDs show impacts on calibrations of both vital parameters, which have converse effects on CRR-Vs1 curves. This study suggests that the CRR-Vs1 correlation should be independent of PSDs.
Highlights
Soil liquefaction is one of the hardest challenges that scientists and engineers are facing
Shear wave velocity corrected for overburden stress (Vs1, s for shear and 1 for principal direction of overburden stress) is widely considered as a promising alternative to assess the liquefaction resistance of granular soils
Previous researchers[1,2,3] performed numbers of cyclic tri-axial and dynamic centrifuge tests, whose work verified the reliability and suggested the Cyclic Resistance Ratio (CRR)-Vs1 correlation could be affected by soil types because the shear modulus (Gg) and the inter-particle friction parameter of soil particles play vital roles[4], as shown by equation (1)
Summary
Soil liquefaction is one of the hardest challenges that scientists and engineers are facing. Shear wave velocity corrected for overburden stress (Vs1, s for shear and 1 for principal direction of overburden stress) is widely considered as a promising alternative to assess the liquefaction resistance of granular soils. It is difficult to directly measure the inter-particle friction parameter or the shear modulus of grains. The value of φg obtained is 39.9e, and Gg is 6.649GPa[4, 5]. Using these two calibrated parameters, they produced a prediction curve which achieved 92% accuracy in separating liquefied and non-liquefied cases of centrifuge tests
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