You are performing a consolidation test on a normally consolidated soil with a compression index, Cc,...
You are performing a consolidation test on a normally consolidated soil with a compression index, Cc, of 0.39 and a recompression index, Cr, of 0.04. The sample is taken from a depth of 12.7 of a stratum with a groundwater table at a depth of 3.3. The unit weight of the soil is 105.6 lb/ft3.
What should the preconsolidation stress be for the soil specimen you are testing? Provide your answer in lb/ft2.
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You are performing a consolidation test on a normally
consolidated soil with a compression index, Cc,...
9. (10 points) A consolidation test performed on a sample from -depth of the clay layer...
9. (10 points) A consolidation test performed on a sample from -depth of the clay layer results the following: initial void ratio = 0.6-e coefficient of re-compression = 0.025-Cr coefficient of compression 0.224 C preconsolidation stress 3000 psf. coefficient of consolidation = 0.065 ft2/day a) Calculate the primary consolidation setlement of the clay layer due to the proposed fill. b) Find the time it takes to complete 90% of the estimated primary consolidation settlement. a) Proposed fill y 120 lbt...
Two undisturbed clay samples were taken from the middle of the overconsolidated and normally consolidated clay layers in the soil profile shown. The water table is at the top of the overconsolidated c...
Two undisturbed clay samples were taken from the middle of the
overconsolidated and normally consolidated clay layers in the soil
profile shown. The water table is at the top of the
overconsolidated clay layer. Consolidation tests were carried out
on the two samples and the results are summarized in the table
below. Assume that the bulk, dry, and saturated unit weights of the
sand are 16 kN/m3, 16 kN/m3 and 19
kN/m3, respectively. The specific gravity of the clay
soil...
A standard isotropically consolidated drained triaxial compression loading test (CIDC) conducted on a normally consolidated clay...
A standard isotropically consolidated drained triaxial compression loading test (CIDC) conducted on a normally consolidated clay specimen with a preshear consolidation stress s’c = 150 kPa resulted in a measured peak deviator stress (s1-s3)f = 205 kPa. a. Estimate c’ and f’ b. What would p’f, qf, Ds’1f and Ds’3f be if a standard isotropically consolidated drained triaxial compression unloading test was conducted on the same soil with s’c = 200 kPa? Symbols: s=sigma, f=phi, D=delta, Ds'=delta sigma prime,
Problem 2. [2596] Figure 2 shows a soil profile. The uniformly distributed load on the ground...
Problem 2. [2596] Figure 2 shows a soil profile. The uniformly distributed load on the ground surface is (1) Estimate the primary consolidation settlement of the clay layer due to the application of Ap. (2) If the clay layer is preconsolidated and the average preconsolidation pressure is 80 kPa, what will be the expected primary consolidation settlement if the recompression index is C 0.2 x Cc? p 87 kPa 1 m Dry Sand Sand: Saturated Sand Dry Unit weight: 14.6...
X=22 QUESTION 3 (30 marks) A soil profile at a site is shown in Figure 1....
X=22
QUESTION 3 (30 marks) A soil profile at a site is shown in Figure 1. A soil specimen is taken from the middle of the clay layer and subjected to a consolidation test, and following properties are reported. • Moisture content of clay = 15% • Specific gravity of soil grains = 2.7 OCR=3.0 • Compression Index (Cc)=0.5 • Recompression Index (Cr)=0.04 a) Calculate the effective vertical stress at the middle of the clay layer (10 marks) b) Calculate...
Question 4 (20 marks): A 2-m thick normally-consolidated clay soil is resting on impermeable shale rock;...
Question 4 (20 marks): A 2-m thick normally-consolidated clay soil is resting on impermeable shale rock; a 20-m thick layer of sandy soil is placed on top of the clay to expedite consolidation process. The unit weight of the sand is 15 kN/m3 and the unit weight of the clay is 10 kN/m3. For the clay layer, the initial void ratio is 2.0, the compression index of the clay is Ce 0.40, the recompression index is C, - 0.10, and...
Name: 12. Which of the following represents the correct standard proctor test procedure? a. 3 soil...
Name: 12. Which of the following represents the correct standard proctor test procedure? a. 3 soil layers, with 30 blows per layer using a 5.5 lb hammer dropped a distance of 12 inches b. 3 soil layers, with 25 blows per layer using a 10 lb hammer dropped a distance of 12 inches c. 5 soll layers, with 30 blows per loyer using a 10 lb hammer dropped a distance of 10 inches d. 3 soll layers, with 25 blows...
9. (10 points) A consolidation test performed on a sample from -depth of the clay layer results the following: initial void ratio = 0.6-e coefficient of re-compression = 0.025-Cr coefficient of compression 0.224 C preconsolidation stress 3000 psf. coefficient of consolidation = 0.065 ft2/day a) Calculate the primary consolidation setlement of the clay layer due to the proposed fill. b) Find the time it takes to complete 90% of the estimated primary consolidation settlement. a) Proposed fill y 120 lbt...
Two undisturbed clay samples were taken from the middle of the
overconsolidated and normally consolidated clay layers in the soil
profile shown. The water table is at the top of the
overconsolidated clay layer. Consolidation tests were carried out
on the two samples and the results are summarized in the table
below. Assume that the bulk, dry, and saturated unit weights of the
sand are 16 kN/m3, 16 kN/m3 and 19
kN/m3, respectively. The specific gravity of the clay
soil...
Problem 2. [2596] Figure 2 shows a soil profile. The uniformly distributed load on the ground surface is (1) Estimate the primary consolidation settlement of the clay layer due to the application of Ap. (2) If the clay layer is preconsolidated and the average preconsolidation pressure is 80 kPa, what will be the expected primary consolidation settlement if the recompression index is C 0.2 x Cc? p 87 kPa 1 m Dry Sand Sand: Saturated Sand Dry Unit weight: 14.6...
X=22
QUESTION 3 (30 marks) A soil profile at a site is shown in Figure 1. A soil specimen is taken from the middle of the clay layer and subjected to a consolidation test, and following properties are reported. • Moisture content of clay = 15% • Specific gravity of soil grains = 2.7 OCR=3.0 • Compression Index (Cc)=0.5 • Recompression Index (Cr)=0.04 a) Calculate the effective vertical stress at the middle of the clay layer (10 marks) b) Calculate...
Question 4 (20 marks): A 2-m thick normally-consolidated clay soil is resting on impermeable shale rock; a 20-m thick layer of sandy soil is placed on top of the clay to expedite consolidation process. The unit weight of the sand is 15 kN/m3 and the unit weight of the clay is 10 kN/m3. For the clay layer, the initial void ratio is 2.0, the compression index of the clay is Ce 0.40, the recompression index is C, - 0.10, and...
Name: 12. Which of the following represents the correct standard proctor test procedure? a. 3 soil layers, with 30 blows per layer using a 5.5 lb hammer dropped a distance of 12 inches b. 3 soil layers, with 25 blows per layer using a 10 lb hammer dropped a distance of 12 inches c. 5 soll layers, with 30 blows per loyer using a 10 lb hammer dropped a distance of 10 inches d. 3 soll layers, with 25 blows...
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