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 are: coefficient of consolidation = 0.018 m²/day, compression index=0.3, recompression index = 0.02. A dewatering operation will cause the water table to drop 5m and remain there throughout the project. Calculate the average degree of consolidation of the clay layer 100 days after the onset of dewatering. Express your answer in percent but write only the numeric answer in the text box.
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 are: coefficient of consolidation = 0.018 m²/day, compression index=0.3, recompression index = 0.02. A dewatering operation will cause the water table to drop 5m and remain there throughout the project. Calculate the average degree of consolidation of the clay layer 100 days after the onset of dewatering. Express your answer in percent but write only the numeric answer in the text box.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:Use 10 kN/m³ for the unit weight of water.
Question 9
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
are: coefficient of consolidation = 0.018 m²/day, compression index = 0.3, recompression index =
0.02.
A dewatering operation will cause the water table to drop 5m and remain there throughout the
project. Calculate the average degree of consolidation of the clay layer 100 days after the onset of
dewatering. Express your answer in percent but write only the numeric answer in the text box.
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