A 12 ft. sandy fill is to be added to the saturated clay site shown below. The moist unit weight of the sandy fill is 115 pcf. The data from the consolidation test performed on the clay sample is provided. Sandy fill to be placed m = 115 pef Consolidation test data 10 ft Co = 1.5 C = 0.4 sample 20 ft C, = 0.03 Soft clay sat = 112.4 pcf o= 1000 psf Bedrock
A 12 ft. sandy fill is to be added to the saturated clay site shown below. The moist unit weight of the sandy fill is 115 pcf. The data from the consolidation test performed on the clay sample is provided. Sandy fill to be placed m = 115 pef Consolidation test data 10 ft Co = 1.5 C = 0.4 sample 20 ft C, = 0.03 Soft clay sat = 112.4 pcf o= 1000 psf Bedrock
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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
Transcribed Image Text:A 12 ft. sandy fill is to be added to the saturated clay site shown below. The moist unit weight of the
sandy fill is 115 pcf. The data from the consolidation test performed on the clay sample is provided.
Sandy fill to be placed 7m = 115 pcf /
Consolidation test data
10 ft
Co = 1.5
C = 0.4
1 sample
20 ft
C, =0.03
Soft clay sat = 112.4 pcf
o = 1000 psf
Bedrock

Transcribed Image Text:A. Draw a consolidation curve (void ratio vs. vertical effective stress) that illustrates the loading phase of this
clay layer and the unloading phase. Label the key consolidation parameters given in the examples.
B. Explain what overconsolidated and normally consolidated means, and how each relates to the
overconsolidation ratio (OCR). Calculate OCR for the middle of the soft clay layer prior to sand loading, years
after sand loading (fully consolidated) and years after sand unloading.
C. Assuming the bedrock is impermeable, determine the time it took the clay layer to reach 90% consolidation
after sand fill placement and after sand fill removal. Assume cv = 8 e-6 ft^2/s.
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