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A clay soil is tested in a consolidometer. When pressure was increased from 140 kN/m2 to 250 kN/m2, void ratio decreased from 0.8 to 0.6. If the thickness of the clay layer is 4.0 m, what is the consolidation settlement due to given stress increment?
  • a)
    0.98 m
  • b)
    1.25 m
  • c)
    0.32 m
  • d)
    0.44 m
Correct answer is option 'D'. Can you explain this answer?
Most Upvoted Answer
A clay soil is tested in a consolidometer. When pressure was increased...
Consolidation settlement = 
Where, H = thickness of the clay layer = 4 m
e0 = initial void ratio = 0.8
∆e = 0.8 - 0.6 = 0.2
Consolidation settlement 
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Community Answer
A clay soil is tested in a consolidometer. When pressure was increased...
B. Calculation of consolidation settlement:

The consolidation settlement of a soil layer can be calculated using the relationship between void ratio and pressure. The equation for consolidation settlement is:

ΔH = (e2 - e1) × H

where ΔH is the consolidation settlement, e2 is the final void ratio, e1 is the initial void ratio, and H is the thickness of the soil layer.

Given that e1 = 0.8, e2 = 0.6, and H = 4.0 m, we can substitute these values into the equation to find the consolidation settlement:

ΔH = (0.6 - 0.8) × 4.0
= -0.2 × 4.0
= -0.8 m

The negative sign indicates that the soil layer is undergoing consolidation and settling due to the increase in pressure. However, consolidation settlement cannot be negative. Therefore, we take the absolute value of the settlement:

|ΔH| = |-0.8 m|
= 0.8 m

So, the consolidation settlement due to the given stress increment is 0.8 m.

c. Choice of option D:

The correct answer is option D, which states 0.44 m. However, this does not match the calculated consolidation settlement of 0.8 m. Therefore, option D is not the correct answer.
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A clay soil is tested in a consolidometer. When pressure was increased from 140 kN/m2 to 250 kN/m2, void ratio decreased from 0.8 to 0.6. If the thickness of the clay layer is 4.0 m, what is the consolidation settlement due to given stress increment?a)0.98 mb)1.25 mc)0.32 md)0.44 mCorrect answer is option 'D'. Can you explain this answer?
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A clay soil is tested in a consolidometer. When pressure was increased from 140 kN/m2 to 250 kN/m2, void ratio decreased from 0.8 to 0.6. If the thickness of the clay layer is 4.0 m, what is the consolidation settlement due to given stress increment?a)0.98 mb)1.25 mc)0.32 md)0.44 mCorrect answer is option 'D'. Can you explain this answer? for Civil Engineering (CE) 2024 is part of Civil Engineering (CE) preparation. The Question and answers have been prepared according to the Civil Engineering (CE) exam syllabus. Information about A clay soil is tested in a consolidometer. When pressure was increased from 140 kN/m2 to 250 kN/m2, void ratio decreased from 0.8 to 0.6. If the thickness of the clay layer is 4.0 m, what is the consolidation settlement due to given stress increment?a)0.98 mb)1.25 mc)0.32 md)0.44 mCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A clay soil is tested in a consolidometer. When pressure was increased from 140 kN/m2 to 250 kN/m2, void ratio decreased from 0.8 to 0.6. If the thickness of the clay layer is 4.0 m, what is the consolidation settlement due to given stress increment?a)0.98 mb)1.25 mc)0.32 md)0.44 mCorrect answer is option 'D'. Can you explain this answer?.
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