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Question: soil mechanics...

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Soil mechanics
5. A cofferdam was made in soil that has specific gravity of 2.7 and void ratio of 0.7. Please calculate the hydraulic gradient of seepage water to cause the soil block in the downstream of cofferdam to liquefy/collapse. 6. A sample, 75 mm in diameter and 20 mm high was consolidated in an oedometer with drainage at upper and lower boundaries. It took the laboratory sample 15 minutes to reach 50% consolidation. Please calculate the coefficient of consolidation of the soil specimen.
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