The effective stress at a point located at a depth of 5.5 ft in a saturated soil (γm = 108 lb/ft3, γsat = 118 lb/ft3) is most nearly:
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The effective stress at a point located at a depth of 5.5 ft in a saturated soil (γm = 108 lb/ft3, γsat = 118 lb/ft3) is most nearly:
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- Refer to Figure 10.48. If R = 4 m and hw = height of water = 5 m, determine the vertical stress increases 2 m below the loaded area at radial distances where r = 0, 2, 4, 6, and 8 m. Circular contact area of radius R on the ground surface Figure 10.481. Calculate total stress, pore-water pressure and effective stress at location A. If the water table rises to ground surface level what will be the increase or decrease in effective stress at location A. Ground Surface 4 m 5m 6 m 3 = 1600 kg/m P₁= 3 P= 1750 kg/m sat 3 PF 800 kg/m sub A Sand Silty Sand Silty ClayA Dry sand 6m Ydry = 16.5 kN/m³ B Groundwater table Saturated sand Ysat = 19.25 kN/m³ 13m Dry sand Saturated sand Clay Calculate the following: a. Effective stress at point A in kPa. b. Effective stress at point B in kPa. c. Effective stress at point C in kPa.
- Calculate the effective stress at point A for the following soil profile:11. Consider the downward flow of water through a layer of sand in the tank shown. (see picture below) Void ratio of the soil = 0.52 Specific Gravity = 2.70 Compute the value of h1. (Answer: 0.436) Compute the effective stress at A. (Answer: 17.44 kPa) Compute the effective stress at B. (Answer: 31.98 kPa) Compute the seepage force per unit volume. (Answer: 3.57 kN/m3)3. | Calculate the change in total vertical normal stress (o) and in effective stress (o) ai a depth of 10 feet in a saturated clay layer if the water table is dropped from the ground surface to a depth of 20 feet below the ground surface. The clay has a water content of 35%, S = 100% and G, = 2.75. Assume that no change in degree of saturation or water content occurs when the water table is lowered. Take into account the capillary stresses generated.
- The sub-surface profile at a certain site is shown in Figure. Given that YSM =112pcf, YML =109pcf, /ML,sat =113pcf, lateral earth pressure coefficient at rest K₁ =0.54. Compute U, Ox, Oz, Ox', andoz at Point A. Solution: Total vertical stress at A: O₂ = • Pore water pressure at A: u = • Effective vertical stress at A: 0₂ ● Effective horizontal stress at A: Ox' Total horizontal stress at A: Ox II psf; psf; psf; psf; psf; Silty Sand: (SM). Clayey Silt (ML) ▼ 12 ft 10 ft 11 ftASAPA circular tank full of water, the tank imposes a uniformly distributed load of 2000 lb/ft2 at the ground surface. The radius of the circular area is 10 ft, the soil unit weight is y=110 lb/fť. Compute the following: a) The vertical stress at a point 20 ft below the center of the circular area b) The vertical stress at 20 ft below the ground surface at a horizontal distance of 5 ft from the center of the circular tank. c) The vertical stress at 20 ft below the edge of the circular area d) The vertical stress at 20 ft below the ground surface at a horizontal distance of 18 ft from the center of the circular area.
- A circular tank full of water, the tank imposes a uniformly distributed load of 2000 lb/ft2 at the ground surface. The radius of the circular area is 10 ft, the soil unit weight is =110 lb/ft3. Compute the following:a) The vertical stress at a point 20 ft below the center of the circular areab) The vertical stress at 20 ft below the ground surface at a horizontal distance of 5 ft from the center of the circular tank.c) The vertical stress at 20 ft below the edge of the circular aread) The vertical stress at 20 ft below the ground surface at a horizontal distance of 18 ft from the center of the circular area.A soil profile of sand (7m thick) which overlies a layer of clay (8m thick). Ground water table is located at the interface of the sand and clay. The effective stress at the bottom of the clay layer was determined. If the water table rises to the top of the ground surface, what is the change in effective stress (in kpa) at the bottom of the layer? for sand layer: void ratio = 0.81, specific gravity = 2.74, degree of saturation = 0.65 for the clay layer: void ratio = 0.85, specific gravity = 2.85. A soil profile is shown in figure below. Dry sand Yay- 165 KNm 6m Groundwater table Saturated sand 13m Yu 19.25 kN/m" Dry sand Saturated sand Clay Calculate the following: a. Effective stress at point A in kPa. b. Effective stress at point B in kPa. c. Effective stress at point C in kPa.