The following figure shows a clayey soil, that is 1 dimensionally loaded by a vertical stress of do' = 90 kPa. The clay layer is overlaid by a granular fill (ya = 17.5 kN/m³) of 2 m thickness and underlain by an impermeable rock. The water table is located on the top of the clay layer. A 1-D laboratory consolidation test is conducted on a 2.5 cm thick, doubly drained specimen retrieved from the middle of the clay layer. The field stress conditions were simulated in the sample, and it is found that 90% average consolidation has occurred in 5 mins. Based on the given information, Determine the following: From the lab consolidation data determine the C, for the soil • Compute the pore water pressure at 12 m depth before and immediately after the stress is applied • Determine the total vertical stress at 12 m depth immediately after the application of the stress in the field • At the same depth of 12 m compute the effective stress 10 years after the application of the stress. • Plot the pore water pressure, and effective stress distributions across the clay layer, immediately after the application of the stress and 10 years after the application of stress. • If the Compression index of the soil is 0.03 and the recompression index is 0.0025. The initial void ratio is determined to be 0.98. Determine the total settlement of the clay layer, assuming that the soil is normally consolidated. • Determine the time required for a settlement of 3 cm to occur.
The following figure shows a clayey soil, that is 1 dimensionally loaded by a vertical stress of do' = 90 kPa. The clay layer is overlaid by a granular fill (ya = 17.5 kN/m³) of 2 m thickness and underlain by an impermeable rock. The water table is located on the top of the clay layer. A 1-D laboratory consolidation test is conducted on a 2.5 cm thick, doubly drained specimen retrieved from the middle of the clay layer. The field stress conditions were simulated in the sample, and it is found that 90% average consolidation has occurred in 5 mins. Based on the given information, Determine the following: From the lab consolidation data determine the C, for the soil • Compute the pore water pressure at 12 m depth before and immediately after the stress is applied • Determine the total vertical stress at 12 m depth immediately after the application of the stress in the field • At the same depth of 12 m compute the effective stress 10 years after the application of the stress. • Plot the pore water pressure, and effective stress distributions across the clay layer, immediately after the application of the stress and 10 years after the application of stress. • If the Compression index of the soil is 0.03 and the recompression index is 0.0025. The initial void ratio is determined to be 0.98. Determine the total settlement of the clay layer, assuming that the soil is normally consolidated. • Determine the time required for a settlement of 3 cm to occur.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:5. The following figure shows a clayey soil, that is I dimensionally loaded by a vertical stress of do' = 90
kPa. The clay layer is overlaid by a granular fill (ya = 17.5 kN/m²) of 2 m thickness and underlain by
an impermeable rock. The water table is located on the top of the clay layer. A 1-D laboratory
consolidation test is conducted on a 2.5 cm thick, doubly drained specimen retrieved from the middle
of the clay layer. The field stress conditions were simulated in the sample, and it is found that 90%
average consolidation has occurred in 5 mins. Based on the given information, Determine the following:
.
Determine the total vertical stress at 12 m depth immediately after the application of the stress
in the field
At the same depth of 12 m compute the effective stress 10 years after the application of the
stress.
•
Plot the pore water pressure, and effective stress distributions across the clay layer,
immediately after the application of the stress and 10 years after the application of stress.
.
From the lab consolidation data determine the C, for the soil
Compute the pore water pressure at 12 m depth before and immediately after the stress is
applied
•
If the Compression index of the soil is 0.03 and the recompression index is 0.0025. The initial
void ratio is determined to be 0.98. Determine the total settlement of the clay layer, assuming
that the soil is normally consolidated.
Determine the time required for a settlement of 3 cm to occur.
●
2.5 cm
Ya 17.5 kN/m²
Ysat = 24.5 kN/m³
2 m
15 m
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