Discussion
A sand deposit has a total unit weight of 20 kN/m³ and the water table is at the surface. At 5 m depth the effective overburden stress is nearest to
Answer: C
The total stress is \( 20 \times 5 = 100 \) kN/m² and the pore pressure \( 9.81 \times 5 = 49 \) kN/m², so the effective stress is 51 kN/m². Subtracting rather than adding the water pressure is the point of Terzaghi's relation.
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