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Extreme rainfall can destabilize an apparently safe slope within hours as infiltration reduces matric suction, raises pore water pressure, and weakens the soil’s effective stress. This session demonstrates how coupled stress–seepage analysis in MIDAS GTS NX captures these time-dependent changes and allows failure mechanisms to develop naturally without assuming a predefined slip surface.
Through a 2D layered embankment example, participants will learn how to apply variable rainfall, define realistic groundwater and infiltration boundaries, and compare slope behavior with and without drainage. This workflow helps engineers identify the most critical period of a storm and verify whether drainage can effectively reduce pore water pressure and restore slope stability.
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Description
Extreme rainfall can rapidly destabilize slopes by reducing matric suction, increasing pore water pressure, and weakening soil strength. Traditional steady-state approaches may not fully capture when and where failure develops under changing rainfall conditions.
This session demonstrates how MIDAS GTS NX uses coupled stress–seepage analysis to model variable rainfall and compare slope behavior with and without drainage. Participants will learn how to identify critical failure periods and evaluate whether drainage can effectively lower groundwater levels, reduce pore water pressure, and improve the Factor of Safety.
Key Points
Reveal the Actual Failure Mechanism
Understand how FEM and the Strength Reduction Method capture progressive failure and local weak zones in layered slopes without relying on an assumed slip surface.
Model Variable Rainfall Reliably
Learn how to apply time-dependent rainfall and define Nodal Head, Flux, and runoff conditions to simulate infiltration without generating non-physical pore-pressure spikes.
Verify Drainage Performance Before Construction
Compare groundwater levels, flow paths, saturation, pore water pressure, and Factor of Safety before and after drainage to optimize the stabilization strategy.
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