A 5.00m clay overlain with a 5.00m sand. The sand has a specific gravity of 2.65 and a void ratio of 0.70. The clay has a saturated unit weight of 19.22kN/cub.m, a void ratio of 0.90 and a liquid limit of 60%. The water table is located 1.00m below the ground surface and the soil above the water table is 50% saturated. A load of 75kPa is distributed on top of the ground surface. What is the settlement of the clay layer?

A 5.00m clay overlain with a 5.00m sand. The sand has a specific gravity of 2.65 and a void ratio of 0.70. The clay has a saturated unit weight of 19.22kN/cub.m, a void ratio of 0.90 and a liquid limit of 60%. The water table is located 1.00m below the ground surface and the soil above the water table is 50% saturated. A load of 75kPa is distributed on top of the ground surface. What is the settlement of the clay layer?

Principles of Foundation Engineering (MindTap Course List)

9th Edition

ISBN:9781337705028

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter2: Geotechnical Properties Of Soil

Section: Chapter Questions

Problem 2.10P: The soil profile at a site consists of 10 m of gravelly sand underlain by a soft clay layer. The...

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The soil profile at a site consists of 10 m of gravelly sand underlain by a soft clay layer. The water table lies 1 m below the ground level. The moist and saturated unit weights of the gravelly sand are 17.0 kN/m3 and 20.0 kN/m3, respectively. Due to some ongoing construction work, it is proposed to lower the water table to 3 m below the ground level. What will be the change in the effective stress on top of the soft clay layer?
The soil profile at a site consists of 10 m of gravelly sand underlain by a soft clay layer. The water table lies 1 m below the ground level. The moist and saturated unit weights of the gravelly sand are 17.0 kN/m3 and 20.0 kN/m3, respectively. Due to some ongoing construction work, it is proposed to lower the water table to 3 m below the ground level. What will be the change in the effective stress on top of the soft clay layer?
The profile at a site consists of 5m of sand overlying 10m of compressible clay, which in turn overlies a dense sand. The water table is at the top of the profile. The total unit weight of the top sand is 19kN/m3 and that of the clay is 18kN/m3. The Cv of the clay is estimated to be 5x 10-3 cm2/sec. Initially the clay is normally consolidated. It is planned to place a temporary fill that will exert a vertical load of 200kPa over the entire site. How long must the fill be in place so that, after it is removed, the maximum past pressure at every point in the clay is at least 50kPa larger than the vertical effective stress that existed before the fill was placed?
The profile at a site consists of 5 m of sand overlying 10 m of compressible clay, which in turn overlies a dense sand. The water table is at the top of the profile. The total unit weight of the top sand is 19 kN/m3, and that of the clay is 18 kN/m3. The cv of the clay is estimated to be 5 x 10-3 cm2/sec. Initially the clay is normally consolidated. It is planned to place a temporary fill that will exert a vertical load of 200 kPa over the entire site. How long must the fill be in place so that, after it is removed, the maximum past pressure at every point in the clay is at least 50 kPa larger than the vertical effective stress that existed before the fill was placed?
A soil layer consists of 4m upper layer of dry sand have a Gs= 2.64 and a void ratio of 0.53 and a lower layer is a clay having a void ratio of 1.0 and a specific gravity of 2.75. The effective stress at the bottom of the clay layer is equal to 93.46 kPa when the ground water is table is 4m below the ground surface. What is the thickness of the clay layer?
The soil profile consists of a 12 m layer of sand, 6 m layer of clay and incompressible bedrock.The water table is located 5 m below the ground surface. The weight of sand above the watertable is 17.9 kN/m3 below is 18.4 kN/m3 . The saturated weight of the clay is 18.2 kN/m3. Clayhas a compression index of 0.18 and a void ratio of 0.80. If the structure to be built on theground will increase the soil pressure by 100 kPa, determine the settlement of the clay layer.
A 5.00m clay overlain with a 5.00m sand. The sand has a specific gravity of 2.65 and a void ratio of 0.70. The clay has a saturated unit weight of 19.22kN/cub.m, a void ratio of 0.90 and a liquid limit of 60%. The water table is located 1.00m below the ground surface and the soil above the water table is 50% saturated. A load of 75kPa is distributed on top of the ground surface. What is the overburden pressure on the mid-height of the clay layer?
A layer of sand extends from group level at 9m and overlies a layer of clay of very Low permeability 6m. The water table is 6m below the surface of the sand the saturated unit weight of the sand is 19kn/m3.and that of the clay 20kn/m3.the unit weight of the sand above the ? table is 17kn/m3 .over a short period of time the water table lower by 3m. And expected to remain permanently at that Level. Determine the effective vertical stress at depth of 8 and 12m. Below the ground level.(a) immediately after the lowering of water table (b) several years after the lowering of the water table. Explain your answer for each step.
The soil profile at a site consists of 2 m of sand at the groundlevel, underlain by 6 m of clay, followed by a very stiff claystratum that can be assumed to be impervious and incompressible.The water table is at 1.5 m below the ground level. Themoist and saturated unit weights of the sand are 17.0 kN/m3and 18.5 kN/m3, respectively. The clay has an initial void ratioof 0.810, saturated unit weight of 19.0 kN/m3, and coefficientof consolidation of 0.0014 cm2/s.a. When the ground is surcharged with 3 m high compactedfill with moist unit weight of 19.0 kN/m3, the settlementwas 160 mm in the first year. What would be the consolidationsettlement in the first two years?b. If the clay is normally consolidated, what is the compressionindex of the clay?
2. For a certain soil profile, a uniformly distributed load, ΔP = 50kPa, is applied at the ground surface. Assume CS = 0.20CC. Take e = 0.95, LL = 50, height of clay layer = 8m and PO = 136.9kPa. Determine the settlement of the clay layer caused by primary consolidation if:a. The clay is normally consolidated. b. The preconsolidated pressure PC is 210kPa. c. The preconsolidation pressure PC = 150kPa.
A soil layer consists of 4 meters upper dry sand with a void ratio of 0.45 and a specific gravity of 2.70. The lower 3 meters is clay having a void ratio of 0.9 and a specific gravity of 2.75. The ground water table is 4 meters below ground surface. Compute a) effective stress at 4 meters below ground surfaceb) effectivestress at the bottom of the clay layer c) effective stress at 6 meters below ground surface.
need fast please A 4-meter clay layer (e = 0.95, Gs = 2.61, Cc = 0.335) is overlain with 4-meter-thick sand layer (e = 0.75, G = 2.88). The water table is at the interface of the sand and clay layer. If a 2-meter-thick land fill (γ = 17.39 kN/m3) is placed over the existing ground surface, compute the consolidation settlement (in mm.) of the clay layer. Hint: Use the land fill's resulting pressure on the ground surface as the stress increase. Round off to two decimal places.