RESIDUAL PORE WATER PRESSURE PROPERTIES OF NANJING?S SATURATED FINE SAND UNDER WAVE LOADS WITH VARIABLE AMPLITUDES
(1. Institute of Geotechnical Engineering，Nanjing University of Technology，Nanjing，Jiangsu 210009，China；2. Geotechnical Research Institute，Hohai University，Nanjing，Jiangsu 210098，China)
Abstract：Cyclic triaxial-torsional coupling shear tests are performed on Nanjing?s saturated fine sand，of which the relative density is 50%，under three-directional anisotropic consolidation state by the hollow cylinder apparatus；and step loading is employed to simulate the effect of wave loads with variable amplitudes more realistically. Influences of initial principal stress direction angle，initial deviator stress ratio and initial intermediate principal stress parameter on the relationship between residual pore water pressure and accumulative lost energy are investigated respectively. The results show that with the same accumulative lost energy，the residual pore water pressure decreases with the increasing of initial principal stress direction angle and initial deviator stress ratio；while it increases with the increasing of initial intermediate principal stress parameter. The empirical formula between residual pore water pressure and normalized accumulative lost energy is established preliminarily.
2011, Vol. 30 
