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This session explores a practical top-down modelling approach for deep excavation projects, focusing on how staged construction, support systems, groundwater drawdown, and soil–structure interaction influence excavation performance. Through a 2D deep excavation model in MIDAS GTS NX, we demonstrate how retaining walls, king posts, struts, anchors, and interface elements can be activated step by step to reflect the actual construction sequence. The session also highlights the use of coupled stress–seepage analysis to assess wall deformation, structural forces, formation heave, settlement behavior, pore pressure changes, and seepage effects. Participants will gain practical guidance on building a realistic excavation model and interpreting key results for safe and reliable underground construction analysis.
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