Abstract
The dewatering efficiency of high-water-content dredged slurry can be significantly improved by superabsorbent polymers (SAP) under its self-weight. However, the compressibility and permeability characteristics of naturally deposited SAP-slurry mixture are not well understood. Therefore, oedometer tests were conducted starting from low initial stress to investigate the effect of SAP on the compressibility and permeability characteristics of dredged slurry. Normalized models for void ratio and permeability coefficient were established for dredged slurry in 0.6% SAP content. Quantitative evaluations were performed to assess effects of SAP on the normalized compression curve and relationship between permeability coefficient and consolidation stress. The findings indicate that SAP effectively reduces both void ratio and compressibility of dredged slurry. The compression curves of the dredged slurry containing SAP can be normalized and described by the void index when the effective stress exceeds 60 kPa. SAP modifies the pore structure of dredged slurry, significantly increasing its permeability coefficient, especially when the void ratio exceeds 2.0, at which point the permeability coefficient can increase by up to 10 times its original value. The permeability coefficient of dredged slurry doped with SAP can be normalized based on the vertical effective stress. The permeability coefficient normalization effect and adjustment effect of SAP on void ratio are significantly influenced by the consolidation stress and initial water content.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call