Cyclic Triaxial Test to Measure Strain-Dependent Shear Modulus of Unsaturated Sand

2017 ◽  
Vol 17 (9) ◽  
pp. 04017043 ◽  
Author(s):  
Majid Ghayoomi ◽  
Ganna Suprunenko ◽  
Morteza Mirshekari
Keyword(s):  
Shear Modulus ◽  
Triaxial Test ◽  
Cyclic Triaxial Test ◽  
Cyclic Triaxial ◽  
Unsaturated Sand ◽  
Strain Dependent

MODULUS REDUCTION AND DAMPING CURVES FOR SAND OF SOUTH-EAST COAST OF INDIA

2012 ◽  
Vol 06 (04) ◽  
pp. 1250016
Author(s):  
V. JAYA ◽  
G. R. DODAGOUDAR ◽  
A. BOOMINATHAN
Keyword(s):  
Shear Modulus ◽  
Triaxial Test ◽  
Damping Ratio ◽  
Triaxial Tests ◽  
Hyperbolic Model ◽  
Cyclic Triaxial Test ◽  
Cyclic Triaxial ◽  
Wide Range ◽  
Predictive Relationships ◽  
Modulus Reduction

Adequate information on dynamic soil properties, especially strain dependent shear modulus (G) and damping ratio (ξ) for each soil layer are the essential input data for seismic ground response analysis and soil-structure interaction studies. In the present study, the shear modulus and damping ratio of sand are estimated for a wide range of strains based on undrained strain-controlled cyclic triaxial tests. The bender elements are also utilized in the cyclic triaxial test to estimate the low strain shear modulus. For this purpose, the soil samples are taken from a nuclear power plant site located at the south-east coastal region of India. Based on the experimental results, an empirical expression is developed to calculate the maximum shear modulus, G max as function of void ratio and effective confining stress. Predictive relationships are also developed for estimating normalized shear modulus and damping ratio curves for the sand. The predictive relationships are based on the hyperbolic model and cyclic triaxial test results. The developed modulus reduction and damping ratio curves from the predictive relationships are compared with the previously available curves in the literature.

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