A site is underlain by a 10 meter layer of saturated gravel with unit weight = 20 kN/m3. Point A is located 5 meters below the ground surface. The horizontal effective stress at point A is 30 kPa. Determine the lateral stress ratio of the soil at point A.

The lateral stress ratio of the soil at point A is 0.3

Explanation:

given that; Unit weight = 20 kNm⁻³ at point A 5m below the ground surface,

vertical stress () = 20 kNm⁻³ × 5m ⇒ 100 kNm⁻²

vertical stress () = 100kPa

note that; Horizontal Stress () is given by k()

where "k" is the lateral stress ratio

= k()

k = ÷

k = 30 kPa ÷ 100 kPa

k = 0.3

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