4. A site associated with an excavatic Below the sand layer lies a 6m thick located at the ground surface. Rock obtained from a depth of 9m (poi recompression index = 0.02, and ove and remain there throughout the pro (b) Calculate the average degree of c

Structural Analysis
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Author:KASSIMALI, Aslam.
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Chapter2: Loads On Structures
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4. A site associated with an excavation project is underlain by a 6m thick sand layer with unit weights = 18 and 20 kN/m³.
Below the sand layer lies a 6m thick clay layer with unit weights = 19 and 22 kN/m³, void ratio = 1.3. The water table is
located at the ground surface. Rock lies below the clay layer. The consolidation parameters obtained from testing a sample
obtained from a depth of 9m (point A) are: coefficient of consolidation = 0.015 m²/day, compression index = 0.3,
recompression index = 0.02, and overconsolidation ratio = 5. A dewatering operation will cause the water table to drop 5m
and remain there throughout the project. (a) Calculate the vertical effective stress at point A before dewatering place.
(b) Calculate the average degree of consolidation of the clay layer 100 days after the onset of dewatering. your work
and circle your answer.
takes
Show
Transcribed Image Text:4. A site associated with an excavation project is underlain by a 6m thick sand layer with unit weights = 18 and 20 kN/m³. Below the sand layer lies a 6m thick clay layer with unit weights = 19 and 22 kN/m³, void ratio = 1.3. The water table is located at the ground surface. Rock lies below the clay layer. The consolidation parameters obtained from testing a sample obtained from a depth of 9m (point A) are: coefficient of consolidation = 0.015 m²/day, compression index = 0.3, recompression index = 0.02, and overconsolidation ratio = 5. A dewatering operation will cause the water table to drop 5m and remain there throughout the project. (a) Calculate the vertical effective stress at point A before dewatering place. (b) Calculate the average degree of consolidation of the clay layer 100 days after the onset of dewatering. your work and circle your answer. takes Show
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