Fundamentals of Geotechnical Engineering (MindTap Course List)
5th Edition
ISBN: 9781305635180
Author: Braja M. Das, Nagaratnam Sivakugan
Publisher: Cengage Learning
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Chapter 8, Problem 8.11P
To determine
Find the void ratio and the saturated unit weight of the soil.
Find the total stress, effective stress, and pore water pressure at 5 m depth into the bottom of the lake.
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A soil profile consists of sand (5-m thick) which overlies a layer of clay (4-m 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 the effective stress (in kPa) at the bottom of the clay layer?
For sand layer: Void Ratio = 0.82, Specific gravity = 2.75, Degree of Saturation = 0.76
For clay layer: Void Ratio = 1.09, Specific gravity = 2.76
A soil profile consists of sand (6-m thick) which overlies a layer of clay (5-m thick). The groundwater 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 the effective stress (in kPa) at the bottom of the clay layer?
For sand layer: Void Ratio = 0.72, Specific gravity = 2.61, Degree of Saturation = 0.6
For clay layer: Void Ratio = 0.99, Specific gravity = 2.72
Round off to two decimal places.
A soil profile consists of sand (7-m thick) which overlies a layer of clay (9-m 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 the effective stress (in kPa) at the bottom of the clay layer?
For sand layer: Void Ratio = 0.75, Specific gravity = 2.62, Degree of Saturation = 0.77
For clay layer: Void Ratio = 0.87, Specific gravity = 2.85
Round off to two decimal places.
Chapter 8 Solutions
Fundamentals of Geotechnical Engineering (MindTap Course List)
Ch. 8 - Prob. 8.1PCh. 8 - Prob. 8.2PCh. 8 - Prob. 8.3PCh. 8 - Prob. 8.4PCh. 8 - Prob. 8.5PCh. 8 - Prob. 8.6PCh. 8 - Prob. 8.7PCh. 8 - Prob. 8.8PCh. 8 - Prob. 8.9PCh. 8 - The soil profile at a site consists of 10 m of...
Ch. 8 - Prob. 8.11PCh. 8 - Prob. 8.12PCh. 8 - Prob. 8.13PCh. 8 - Prob. 8.14PCh. 8 - A sand has Gs = 2.66. Calculate the hydraulic...Ch. 8 - Prob. 8.16PCh. 8 - A point load of 1000 kN is applied at the ground...Ch. 8 - Point loads of magnitude 9, 18, and 27 kN act at...Ch. 8 - Refer to Figure 8.13. The magnitude of the line...Ch. 8 - Refer to Figure 8.24. Determine the vertical...Ch. 8 - Consider a circularly loaded flexible area on the...Ch. 8 - A flexible circular footing of radius R carries a...Ch. 8 - The plan of a flexible rectangular loaded area is...Ch. 8 - Refer to Figure 8.26. The circular flexible area...Ch. 8 - Refer to Figure 8.27. The flexible area is...Ch. 8 - Prob. 8.26CTPCh. 8 - Prob. 8.27CTP
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- Question 20 A soil profile consists of sand (5-m thick) which overlies a layer of clay (9-m 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 the effective stress (in kPa) at the bottom of the clay layer? For sand layer: Void Ratio = 0.82, Specific gravity = 2.68, Degree of Saturation = 0.6 For clay layer: Void Ratio = 0.92, Specific gravity = 2.86 Round off to two decimal places.arrow_forwardA layer of soil has the following properties: void ratio = 0.44, effective diameter = 12 μm, capillary constant C = 0.18 cm2 . Groundwater table is 10 m below the ground surface. (a) Find the height of capillary rise in the soil in mm. (b) What is the effective stress in kPa at 7 m depth if unit weight of solids is 25.55 kN/m3 and soil above the capillary zone is 40 % saturated? (c) What is the effective stress in kPa at 14 m depth?arrow_forwardA 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 = 2.85arrow_forward
- need fast please A soil profile consists of sand (6-m thick) which overlies a layer of clay (6-m 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 the effective stress (in kPa) at the bottom of the clay layer? For sand layer: Void Ratio = 0.88, Specific gravity = 2.75, Degree of Saturation = 0.79 For clay layer: Void Ratio = 0.99, Specific gravity = 2.86 Round off to two decimal places.arrow_forwardThe soil profile shown consists of dry sand (5-m thick) which overlies a layer of clay (8-m 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 taable rises to the top of the ground surface, what is the change in effective stress (kpa) at the bottom of the clay layer? For sand layer: Void Ratio= 0.83 SG= 2.68 Degree of Saturation= 0.78 For claylayer: Void Ratio= 0.89 SG=2.88arrow_forwardThe soil profile consists of 5m sand underlain by 13 m layer of clay. The ground water table is at a depth 2.8 m below the surface. The sand has a unit weight of 19 kN per cu. Meter above the ground water table and the saturated unit weight below was 20 kN per cu. meter. The saturated unit weight of the clay is 15.7 kN per cu. meter. At a depth of 11 m determine the following:a. Total stressb. Pore water pressurec. Effective stress.....arrow_forward
- Water depth in a lake is 3 m. A soil sample was collected from the sediment in the lake and the following properties are obtained.Calculate the following pressures at a depth of 12 m below the bed levelof the lake (assume the entire top clay layer is saturated):(A) The total pressure(B) The pore pressure(C) The intergranular pressurearrow_forwardA soil profile as shown below, the saturated unit weight of clay and sand are 19kN/m^3 and 17kN/m^3 respectively. A moist unit weight of clay is 18.5kN/m^3. If the clay above water table is being saturated by capillarity, what is the effective stress at point A and effective stress at point B?arrow_forwardGiven that: • Hydraulic gradient = 0.43 • unit weight of the saturated soil layer = 19.80Kn/m³ • rate and direction of seepage = 4.29 x 10^-4 m³/s (upward) • moisture content of the fully saturated soil layer = 24.25% Answer the ff: a) What would be the critical value of h to cause boiling b) If the value of h= 1.5 m boiling will? and If the value of h= 4.0 m boiling will? c) The total stress at point B d) The effective stress at point B e) The neutral stress at point Barrow_forward
- a dense silt layer has the following properties: void ratio = 0.50, effective diameter d10 = 10 um, capillary constant c = 0.20 cm2. free ground water level is 8.0 m below the ground surface. find the vertical effective stress in kpa at 5m depth. assume unit weight of solids = 26.5 kn/m3 and that the soil = 26.5 kn/m3 and that the soil above the capillary action rise and ground surfaces is partially saturated at 50% from the problem above, find the vertical effective stress at 10m depth. assume unit weight of solids=26.5kN/m3 and that the solid above the capillary action rise and ground surface is partially saturated at 50%.arrow_forwardA uniform soil deposit has a dry unit weight of 15.6 kN/m³ and a saturated unit weight of 17.2 kN/m³. The groundwater table is at a distance of 4 m below the ground surface. Point A is at a depth of 6 m below the ground surface. If the water table rises by 3.5 m, determine the change in effective stress at A. Indicate if it is maintained, increased or decreased.arrow_forwardA soil profile consists of a sand layer underlain by a clay layer, as shown. If the degree of saturation of the sand above water table was 50%. Saturated and dry unit weight of sand are 21.2 kN/m^3 and 18.22 kN/m^3 respectively. The saturated unit weight of clay is 18 kN/m3. Determine the total stress, pore pressure and effective stress at point A,B,C.arrow_forward
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