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3. For the profile shown in Figure P2, a 2 ft fill (unite weight -120pcf) will...
You are evaluating the geotechnical characteristics of a Miami site for a proposed office buildin...
You are evaluating the geotechnical characteristics of a Miami site for a proposed office building. Subsurface investigation showed that the site consists of the following layers: (1) a 5-ft sandy laver with a unit weight of 100 pcf (2) a 10-ft silty sand layer with a saturated unit weight of 115 pcf. (3) a 20-ft saturated clay layer with a unit weight of 118 pef, void ratio of 0.85, and underlain by gravels. The site seemed to have strong potential...
(5 points) 6. A soil profile consists of 4 ft of organic soil (a 75 pe)...
(5 points) 6. A soil profile consists of 4 ft of organic soil (a 75 pe) over a uniform soft clay layer. For the clay y 120 pcf and, ?'/o 1.0 The water table is at the ground surface. For a clay element A, at the depth of 10 feet from the ground surface (6 feet into the soft clay) compute the following Assume a wide fill, thickness 7 feet, ? 105 pcf is placed over the surface of the...
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...
In the figure below, the natural soil profile consists of sand overlying clay overlying sand overlying bedrock. A water...
In the figure below, the natural soil profile consists of sand
overlying clay overlying sand overlying bedrock. A
water table is present 1 m beneath the surface of the natural
ground. If 4 m of consistent fill material (γfill = 15
kN/m3) was placed on top of this soil profile that covered a
large area, determine:
(a) The consolidation settlement of the clay layer (using 4
equal layers in your calculation), and
(b) The time (in days) for this consolidation...
A 20 ft thick fill with a unit weight of 120 Ib/ft3 is to be placed...
A 20 ft thick fill with a unit weight of 120 Ib/ft3 is to be placed on the soil profile shown in Figure 12.6. Assuming the fill is placed instantaneously, use the curves in Figure 12.4 to develop a plot of ue vs. depth at 1.5 yr. Plot depth on the vertical axis, increasing downward, and consider depths from the original ground surface to the bottom of the CL stratum.
6. (former exam question) A large granular free draining fill 6-ft thick was placed on a...
6. (former exam question) A large granular free draining fill 6-ft thick was placed on a 15-ft thick layer of clay as shown in the figure below. A piezometer was installed at the midpoint of the clay layer. The water table is at the original ground surface. Three years after the placement of the fill, the piezometer reads 7.63 ft above the ground water level. Answer the following questions: a. What percentage of the total consolidation for the entire clay...
Question 5 (Effective Stress & Consolidation) Figure 05 shows the soil profile of a construction site....
Question 5 (Effective Stress & Consolidation) Figure 05 shows the soil profile of a construction site. The water table is at the ground surface. Saturated unit weight of the sand is 18.8kN/m' and that of the clay is 19.6kN/m. Assume permeability of the clay is very low and unit weight of water is 10kN/m'. Water Table Sand 5m Clay 6m Figure 05 a) Determine the vertical total stress, pore water pressure, and vertical effective stress at the mid-height of the...
Example 2:3 The soil profile at a site consists of a 3 m thick sand layer...
Example 2:3 The soil profile at a site consists of a 3 m thick sand layer (Ybulk -16.5 kN/m3 sat18.5 kN/m3) underlain by a 6 m thick clay layer (w-27%, Gs-270, m,-0.31 MPa", cv-2.6 m2/year), which is underlain by a gravel layer. A 3 m compacted fill with a unit weight of 20 kN/m3 is to be placed at ground level. a. What would be the final consolidation settlement? b. How long will it take for 50 mm of consolidation...
The total settlement for clay being the elastic settlement plus the primary consolidation settlement. 2. A...
The total settlement for clay being the elastic settlement
plus the primary consolidation settlement.
2. A foundation carrying 150 kips needs to be designed in New Jersey (frost depth 3 ft) for a FOS of 3. The founding soil is deep normally consolidated clay deposit with average Su value of 1100 psf, and saturated unit weight of 130 pcf and a moist unit weight of 110 pcf with water table at 3 ft depth. The laboratory tests performed on undisturbed...
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...
You are evaluating the geotechnical characteristics of a Miami site for a proposed office building. Subsurface investigation showed that the site consists of the following layers: (1) a 5-ft sandy laver with a unit weight of 100 pcf (2) a 10-ft silty sand layer with a saturated unit weight of 115 pcf. (3) a 20-ft saturated clay layer with a unit weight of 118 pef, void ratio of 0.85, and underlain by gravels. The site seemed to have strong potential...
(5 points) 6. A soil profile consists of 4 ft of organic soil (a 75 pe) over a uniform soft clay layer. For the clay y 120 pcf and, ?'/o 1.0 The water table is at the ground surface. For a clay element A, at the depth of 10 feet from the ground surface (6 feet into the soft clay) compute the following Assume a wide fill, thickness 7 feet, ? 105 pcf is placed over the surface of the...
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...
In the figure below, the natural soil profile consists of sand
overlying clay overlying sand overlying bedrock. A
water table is present 1 m beneath the surface of the natural
ground. If 4 m of consistent fill material (γfill = 15
kN/m3) was placed on top of this soil profile that covered a
large area, determine:
(a) The consolidation settlement of the clay layer (using 4
equal layers in your calculation), and
(b) The time (in days) for this consolidation...
A 20 ft thick fill with a unit weight of 120 Ib/ft3 is to be placed on the soil profile shown in Figure 12.6. Assuming the fill is placed instantaneously, use the curves in Figure 12.4 to develop a plot of ue vs. depth at 1.5 yr. Plot depth on the vertical axis, increasing downward, and consider depths from the original ground surface to the bottom of the CL stratum.
6. (former exam question) A large granular free draining fill 6-ft thick was placed on a 15-ft thick layer of clay as shown in the figure below. A piezometer was installed at the midpoint of the clay layer. The water table is at the original ground surface. Three years after the placement of the fill, the piezometer reads 7.63 ft above the ground water level. Answer the following questions: a. What percentage of the total consolidation for the entire clay...
Question 5 (Effective Stress & Consolidation) Figure 05 shows the soil profile of a construction site. The water table is at the ground surface. Saturated unit weight of the sand is 18.8kN/m' and that of the clay is 19.6kN/m. Assume permeability of the clay is very low and unit weight of water is 10kN/m'. Water Table Sand 5m Clay 6m Figure 05 a) Determine the vertical total stress, pore water pressure, and vertical effective stress at the mid-height of the...
Example 2:3 The soil profile at a site consists of a 3 m thick sand layer (Ybulk -16.5 kN/m3 sat18.5 kN/m3) underlain by a 6 m thick clay layer (w-27%, Gs-270, m,-0.31 MPa", cv-2.6 m2/year), which is underlain by a gravel layer. A 3 m compacted fill with a unit weight of 20 kN/m3 is to be placed at ground level. a. What would be the final consolidation settlement? b. How long will it take for 50 mm of consolidation...
The total settlement for clay being the elastic settlement
plus the primary consolidation settlement.
2. A foundation carrying 150 kips needs to be designed in New Jersey (frost depth 3 ft) for a FOS of 3. The founding soil is deep normally consolidated clay deposit with average Su value of 1100 psf, and saturated unit weight of 130 pcf and a moist unit weight of 110 pcf with water table at 3 ft depth. The laboratory tests performed on undisturbed...
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...
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