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Unified modeling of consecutive filtration and consolidation processes in vacuum-assisted dewatering on ultra-soft soils
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DOI：10.1016/j.jrmge.2026.05.038.png)
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Abstract
En 中文
The vacuum-assisted dewatering of flowable slurry is inevitably preceded by an initial filtration stage before consolidation. In this context, a unified nonlinear model is proposed to predict the consecutive filtration and consolidation processes of ultra-soft soils under vacuum preloading. A novel constitutive law is introduced to capture the continuous evolution from a suspended state to a fully developed soil skeleton. The moving-boundary condition is adopted to trace the spatiotemporal growth of the soil column, thereby identifying the filtration endpoint and determining the initial state for subsequent consolidation. The model also considers staged vacuum loading and drain resistance, and a unified governing equation expressed in terms of effective stress is derived for the entire dewatering process. A model test is carried out to verify the validity of the current model and demonstrate the essential role of the filtration stage. Furthermore, parametric analysis reveals that high filtration pressure generates a denser and less permeable soil column that impedes the ensuing consolidation efficiency. Compared with the limited gains achieved by increasing filtration pressure, larger consolidation pressure markedly promotes the settlement performance. Additionally, the filtration stage contributes most of the overall settlement, and this proportion escalates with higher initial water content. Increased drain resistance restricts the effective stress transfer and soil column formation, which substantially retards the dissipation of excess pore water pressure (EPWP) in the outer regions of the influence zone. Overall, the unified model provides a physically consistent framework for predicting full-process dewatering of ultra-soft slurry, which supports rational parameter design to improve dewatering efficiency of vacuum preloading.
Keywords:
Unified model
Coupled filtration-consolidation
Vacuum preloading
Moving boundary
Slurry dewatering
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