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
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
Fundamentals of Geotechnical Engineering (MindTap Course List)
5th Edition
ISBN:9781305635180
Author:Braja M. Das, Nagaratnam Sivakugan
Publisher:Braja M. Das, Nagaratnam Sivakugan
Chapter9: Consolidation
Section: Chapter Questions
Problem 9.14P
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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
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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
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