Which outcome develops when cohesive properties saturate alluvial soil?

💡 Explanation

Increased pore water pressure reduces effective stress, initiating soil creep because the shear strength declines via internal frictional resistance reduction, therefore the soil yields to gravity rather than remaining geometrically stable due to capillary action alone.

• Which outcome occurs when groundwater seeping into a limestone cave with localized high CO2 concentration encounters reduced atmospheric CO2 above?
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• Which mechanism causes increased flood risk when building impermeable surfaces on an alluvial fan?
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