How to introduce rainfall in FLAC 3D for performing slope stability analysis for different rainfall intensities and duration. Any specific procedure.
Thank you in Advance
Effect of rainfall on slope is multi-fold:
Stability of the slope itself reduces because of the reduction in shear strength parameters in wet condition as well as increase in pore water pressures.
Moreover, erosion of the slope resulting in subsequent damage to the slope geometry can happen due to:
1. Impact of raindrops on slope material
2. Formation of gullies which allow streamlined flow of water
3. Toe erosion resulting from water accumulating at the toe
FLAC cannot on its own simulate all these effects into modelling. Only way you might check the stability is include ground water flow in the analysis and apply relevant pore water pressures and strength reduction, based on change in moisture content of the soil, which needs a suitable hydrological model for the soil slope and Soil Moisture Deficit (SMD) variation with seasons. Best way to do this use CHASM (Combined Hydrology And Stability Model) to get the precipitation simulations for any combinations of rainfall events combined with FLAC to study the effect of the projected soil moisture variations on the stability of a slope.
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