Initial shear stress effects on dynamic properties of reclaimed soil in offshore area

In this study, the reclaimed soil in Yun-Ling nearshore area was adopted as testing samples. Different relative densities and consolidation stress ratio were taken into consideration to prepare specimens by the moist tamping method. A series of resonant column triaxial test were performed, to discuss the shear modulus and damping ratio of the reclaimed soil under different intial shear stress and different consolidation stress ratios. In this study, different consolidation stress ratio were used to simulate the reclaimed soil under different initial shear stress. As shown in the test results, the shear modulus of the reclaimed soil increases as the consolidation stress ratio and mean effective confining pressure increase. Similarly, G max also increases as the consolidation stress ratio increases, but is not influenced by the different initial relative density. The increment of G max induced by consolidation stress ratio is larger than the increment induced by different viod ratios. The influence of consolidation stress ratio on damping ratio is not distinct. Summarizing all the analyzed results and based on the method suggested by Hardin and Richart (1963), a new method to evaluate maximum shear modulus and shear modulus under different shear strain for offshore reclaimed soil under anisotropic consoilidation is estabilished. The results in this paper can be provided for reference purposes during design, construction and dynamic analysis on land reclamation.