Civil Engineering A multistory building with a basement is to be constructed. The top 4 m consists of loose silt, below which dense sand layer is present up to a great depth. Ground water table is at the surface. The foundation consist of the basement slab of 6m width which will rest on the top of dense sand as shown in the figure. For dense sand, saturated unit weight = 20 kN/m³, and bearing capacity factors Na 40 and Ng = 45. For loose silt, saturated unit weight = 18 kN/m³, No = 15 and Ng = 20. Effective cohesion c ¢ is zero for both soils. Unit weight of water is 9.81 kN/m³. Neglect shape factor and depth factor. Average elastic modulus E and Poisson's ratio m of dense sand is 60 x 103 kN/m² and 0.3 respectively. Ground surface XXX Loose silt 4 m Basement Foundation slab 6m Dense sand ➜ Y XXX Loose silt The foundation slab is subjected to vertical downward stresses equal to net safe bearing capacity derive in the above question. Using influence factor If = 2.0, and neglecting embedment depth and rigidity corrections, the immediate settlement of the dense sand layer will be:

Civil Engineering A multistory building with a basement is to be constructed. The top 4 m consists of loose silt, below which dense sand layer is present up to a great depth. Ground water table is at the surface. The foundation consist of the basement slab of 6m width which will rest on the top of dense sand as shown in the figure. For dense sand, saturated unit weight = 20 kN/m³, and bearing capacity factors Na 40 and Ng = 45. For loose silt, saturated unit weight = 18 kN/m³, No = 15 and Ng = 20. Effective cohesion c ¢ is zero for both soils. Unit weight of water is 9.81 kN/m³. Neglect shape factor and depth factor. Average elastic modulus E and Poisson's ratio m of dense sand is 60 x 103 kN/m² and 0.3 respectively. Ground surface XXX Loose silt 4 m Basement Foundation slab 6m Dense sand ➜ Y XXX Loose silt The foundation slab is subjected to vertical downward stresses equal to net safe bearing capacity derive in the above question. Using influence factor If = 2.0, and neglecting embedment depth and rigidity corrections, the immediate settlement of the dense sand layer will be:

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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A layer of silty clay with a thickness of 10 m, sand with a thickness of 2m from the bottom and topit is located between. The groundwater level at the site is at the ground surface. In the fielda large area spread filling that acts on the ground surface and transfers stress of 100 kPait has a payload of. Unit volume weight of silty clay floor 18 kN / m3 and consolidationaccording to the coefficient of 0.3 m2/month, 50 months after the construction of the fill,find the silty sand layer in the middlehow many m will the water rise over the ground surface in a submerged piezometer pipe(take the unit volume weight of water 10 kN/m3)
The soil profile at a road construction site is as shown in figure (not to scale). A large embankment is to be constructed at the site. The ground water table (GWT) is located at the surface of the clay layers, and the capillary rise in the sandy soil is negligible. The effective stress at the middle of the clay layer after the application of the embankment loading is 180 kN/m². Take unit weight of water, Yw = 9.81 kN/m3. Embankment load boudi Sand GWT 2m y = 18.5 kN° it enit Clay Specific gravity, G̟ = 2.65 Water content, w = 45% Compession index, C. = 0.25 6m %3D %3D Impermeable layer The primary consolidation settlement (in m, round off to two decimal places) of the clay layer resulting from this loading will be
Problem3) A rectangular concrete slab, 3m×4m, rests on the surface of a 8m fully saturated clayey soil. Water content of the soil is 43%. The load on the slab is 5000KN. Determine the vertical stress increase at a depth of 4m under the center of the slab, point C. Then, calculate the primary consolidation settlement. ( Сс-0.3 4 m
The first layer 2m thick very fine wet sand with silt having water content of 8% and S=45% lying in 3.4m thick of fine sand with a moisture content of 14% and below of this fine sand is a clay with water content of 28% and a thickness of 15m.The water table is located 3m below the ground and they found out that there is a 1m of capillary rise that's being fully saturated. Find the unit weight of the first layer if all soils have 2.8 specific gravity.
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?
Please solve this problem with a good explantion and step by step solution
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 overburden pressure on the mid-height of the clay layer?
stress and pore water pressure. 2- A soil profile consists of 10m of sand (Y=20 kN/m') over 3m of organic silt (Y=17KN/m?; 0.5,OCR = 1,c, = 8 m?/year)over gravel. Initially, the water table is 2m below the ground surface and hydrostatic condition exists throughout the soil profile. Before constructing a structure on this site, the organic silt is preconsolidated by rapidly lowering the water table by 6m (to 8m below the ground surface) and simultaneously pumping from the gravel layer at such rate that the piezometric level in the gravel is lowered to the bottom of the organic silt. Compute settlement resulting from consolidation of the organic silt if the lowered ground water
For the profile shown, draw the diagrams of: a) Total effort. Pore pressure and Effective effort b) If the water level rises to the surface, how much is the variation to the effective stresses in the clay base.
The first layer 2m thick very fine wet sand with silt having water content of 8% and S=45% lying in 3.4m thick of fine sand with a moisture content of 14% and below of this fine sand is a clay with water content of 28% and a thickness of 15m.The water table is located 3m below the ground and they found out that there is a 1m of capillary rise that's being fully saturated. What is the effective stress 2.5 meters below ground surface if all soils has 2.8 specific gravity?