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Mechanism of two-side effect of dewatering in deep excavation: Mitigating wall deflection but aggravating ground settlement
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DOI：10.1016/j.undsp.2026.04.002.png)
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Abstract
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• Adjacent deep structures act as barriers, altering groundwater flow paths during excavation dewatering. • Increased buried depth of nearby structures reduces pit inflow and wall deflection but amplifies surface settlement. • Existing structures induce differential drawdown across their profile, posing non-uniform deformation risks. • Laboratory tests through multi-depth modeling prove proportional growth of water-blocking effect to buried depth. • Water-blocking effect at large depths necessitates barrier consideration in dewatering well and support system design.
Keywords:
Deep excavation
Dewatering
Barrier effect
Laboratory experiment
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