1) What is meant by capillary rise in soil? How does it affect the pre-water pressure?

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1)     What is meant by capillary rise in soil? How does it affect the pre-water pressure?

 

Capillary rise is the upward movement of water through the tiny pores (voids) in soil due to surface tension and adhesive forces between water and soil particles. This occurs above the water table, where the soil is unsaturated, but moisture is still present.

 

ü  Effect on Pore Water Pressure:

 

·        In the capillary zone, pore water pressure is negative (also called suction or tension).

·        This negative pressure increases the effective stress in the soil (since effective stress = total stress − pore pressure).

·        Result: Soils in the capillary zone can gain apparent strength due to suction.

 

 

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