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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.

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Answer:

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

Step-by-step explanation:

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

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

vertical stress (
V_(stress)) = 100kPa

note that; Horizontal Stress (
H_(stress)) is given by k(
V_(stress))

where "k" is the lateral stress ratio


H_(stress) = k(
V_(stress))

k =
H_(stress) ÷
V_(stress)

k = 30 kPa ÷ 100 kPa

k = 0.3

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