Abstract：Numerous indoor tests and engineering applications have confirmed the superiority of prefabricated horizontal drains (PHDs) combined with vacuum preloading in the treatment of dredged sludge yards. However, existing consolidation theories for PHDs-treated dredged slurry currently do not account for the effects of well resistance. This study, based on Gibson′s large strain consolidation theory, incorporates the well resistance effect of PHDs and introduces the nonlinear compressibility and permeability of dredged sludge to establish a consolidation model for treating dredged sludge yards using PHDs in conjunction with vacuum preloading. Solutions for the proposed consolidation model are derived and validated through comparative analysis with existing self-weight consolidation models for ideal PHD configurations and laboratory test results. Furthermore, the influence of well resistance effects on consolidation behavior is systematically investigated. The results indicate that well resistance effects slow down the dissipation rate of excess pore water pressure, consolidation rate, and settlement deformation; however, this retardation progressively diminishes with decreasing well resistance. The magnitude of well resistance is influenced by the installation length of PHDs, the permeability coefficient, the laying ratio of PHDs, and the height of the sludge. Optimizing the layout of PHDs enhances the consolidation efficiency of dredged sludge. Prioritizing the alignment of PHDs along shorter repository dimensions effectively mitigates the impacts of well resistance on consolidation processes. When the laying ratio (?) remains below 40%, increasing ? improves consolidation rates through enhanced drainage capacity. Beyond this threshold, however, the implementation of multi-layer PHDs becomes essential to achieve further efficiency gains.
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2025, Vol. 44 
