Question

In: Civil Engineering

what pressure allows fine beach sand to have good bearing capacity at low tide on flat...

what pressure allows fine beach sand to have good bearing capacity at low tide on flat area near water?

Solutions

Expert Solution

On flat area near the water, we have capillary zone;

The effect of the capillary is the same as that of surcharge , it helps in increasing effective stress.

Stresses Point A Point B Point C
Total Stress () 0
Pore Water Stress (u) 0
Effective Stress ( = )

[Note: If the soil would have been saturated due to groundwater table instead of capillary water, effective stress in the soil would have decreased by due to increased pore water pressure].

As effective stress increases shear strength also increases, as;

i.e.

and hence the increased effective pressure allows the fine beach sand to have the good bearing capacity of the soil in the flat area near the water at low tide.


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