Experimental study on consolidation characteristics of polyacrylamide-modified lime-stabilized dredger fill

The technology of dredger fill treatment becomes one of the technical difficulties in soft soil foundation treatment. The compressive strength and shear strength of dredger fill can be improved by adding lime and other solidified materials,but the deformation performance will decline. The effect of different dosages of polyacrylamide on the consolidation behaviors of lime solidified dredger fill is discussed by indoor one-dimensional consolidation tests and mercury intrusion porosimetry. The test shows that the polyacrylamide can effectively improve the deformation capacity of the dredger fill cemented by lime, and make it close to the consolidation performance of the non-reinforced dredger fill. The presence of polyacrylamide can also increase by 54% of the structural yield stress than that of lime solo addition. The addition of polyacrylamide can increase the coefficient of consolidation of lime solidified dredger fill, and the additional proportion of polyacrylamide is larger, the consolidation rate of increase is greater. The pore-size distribution is rearranged as a result of the lime and PAM addition, which leads to large porosity and higher permeability. The microscopic parameters are in correlation with the macroscopic deformation behaviors in essence.