A normally consolidated clay soil and an over consolidated clay soil

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A normally consolidated clay soil and an over consolidated clay soil with the same initial dry unit weight and initial void ratio are subjected to an identical increase in the effective stress. Which one undergoes higher rate of settlement? Justify your answer. [4 marks]
b. A clay soil profile of 5m thickness overlies 2m dense sand. A well with depth of 3m is excavated in the clay soil. What is the state of the soil at points A (Figure Q4) (Normally consolidated soil or over consolidated soil). Explain why? [4 marks]
c. For a normally consolidated clay soil if the drainage condition changes from double drainage at the top and bottom of the clay layer to single drainage at the top only, what will be the change in time required for 100% primary consolidation?

 

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