Modulus and Damping Curves of Ottawa sand from Centrifuge and Full Scale Tests Inthuorn Sasanakul Prompat Kasantikul.

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Presentation transcript:

Modulus and Damping Curves of Ottawa sand from Centrifuge and Full Scale Tests Inthuorn Sasanakul Prompat Kasantikul

Resonant Column (RC) and Torsional Shear (TS) Tests Stokoe-Type Apparatus Fixed-free Configuration Drive System Utilizing Coil-Magnet System

Resonant Column Test Shear modulus (G) or Shear Wave Velocity (Vs) Damping (D) Half Power Bandwidth MethodFree Vibration Decay Method

Torsional Shear test

Generic Modulus and Damping Curves for fine grain soil (Vucetic and Dobry, 1991)

RC/TS Calibrations for RPI Apparatus Polar Moment of Inertia of the Drive Plate Calibration Equipment Damping Calibration Torque Calibration RC/TS testing on generic sands such as Nevada sand

Results of RC test on dry Nevada sand Variation of shear Wave Velocity with confining Pressure and void ratio in dry clean sand with rounded particle (Hardin and Richart,1963) Vs=( e)σ

Test properties for Centrifuge model and Full Scale tests Test SandFieldVoidRelativeSaturatingHydraulicCompression NoConditionTypeAngleRatioDensityFluidConductivityIndex Degree %ViscosityCoefficientCc cpcm/sec LG0Full ScaleOttawa F# *10^-2- SG1Full ScaleOttawa F# *10^-2- C-LG0CentrifugeOttawa F# *10^-26.36*10^-3 C-SG1CentrifugeScaled Sand *10^-26.61*10^-2 Summary of the Soil Properties Soil NameD50D10FC (%)MinimumMaximumGs (mm) Void Ratio Ottawa F# Scaled Sand

Preliminary Test Result of RC test on Dry Ottawa Sand (e = 0.695)

Comparison with Hardin & Richard et al (1963) Vs=( e)σ

RC/TS Testing Program on Dry Ottawa Sand Preliminary Plan TestSandTestVoid Confining Pressure (kPa) NoTypeMethodRatio 123 1Ottawa F#55RC/TS Ottawa F#55RC/TS Ottawa F#55RC/TS Scaled SandRC/TS Scaled SandRC/TS Scaled SandRC/TS