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Chen Guoxing,Pan Hua
Author NameAffiliation
Chen Guoxing Institute of Geotechnical Engineering,Nanjing University of Technology,Nanjing 210009,China 
Pan Hua Institute of Geotechnical Engineering,Nanjing University of Technology,Nanjing 210009,China 
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Effect of Initial Stress Conditions on the Threshold Shear Strain of Nanjing's Saturated Fine Sand
Chen Guoxing,Pan Hua
Abstract:
By using GDS dynamic hollow cylinder torsional apparatus,a series of cyclic torsional triaxial tests under complex initial consolidation condition are performed on Nanjing saturated fine sand. The effects of the initial principal stress direction α0,the initial ratio of deviatoric stress η0,the initial average effective principal stress p0 and the initial intermediate principal stress parameter b0 on the threshold shear strain γt of Nanjing saturated fine sand are then systematically investigated. The results show that γt increases as η0,p0 and b0 increase respectively,while the other three parameters remain constant. α0 has a great influence on γt,which is reduced when α0 increases from 0° to 45° and increased when α0 increases from 45° to 90°. The effect of α0 on γt plays a leading role and the effect of η0 will weaken when α0 is approximately 45°.
Key words:  Nanjing saturated fine sand  Initial stress condition  Threshold shear strain  Hollow cylinder torsional apparatus  Cyclic torsional triaxial