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A multistory building with a basement is to be constructed. Top 4 m consists of loose silt, below which dense sand layer is present upto a great depth. Ground water table is at the surface. The foundation consists of the basement slab of 6 m 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 N₁ = 40 and N, = 45. For loose silt, saturated unit weight = 18 kN/m³, N₁ = 15 and N, = 20. Effective cohesion C is zero for both soils. Unit weight of water is 10 kN/m³. Neglect shape factor and depth factor. Average elastic modulus E and Poisson's ratio of dense sand is 60 × 103 kN/m² and 0.3 respectively. Ground surface X 4 m Loose silt + Basement foundation slab 6 m * Loose silt Dense sand (i) Using factor of safety = 3, the net safe bearing capacity (in kN/m²) of the foundation is ? (ii) The foundation slab is subjected to vertical downward stresses equal to net safe bearing capacity derived in the above question (i). Using influence factor I, = 2.0, and neglecting embedment depth and rigidity corrections, calculate the immediate settlement of the dense sand layer.

A multistory building with a basement is to be constructed. Top 4 m consists of loose silt, below which dense sand layer is present upto a great depth. Ground water table is at the surface. The foundation consists of the basement slab of 6 m 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 N₁ = 40 and N, = 45. For loose silt, saturated unit weight = 18 kN/m³, N₁ = 15 and N, = 20. Effective cohesion C is zero for both soils. Unit weight of water is 10 kN/m³. Neglect shape factor and depth factor. Average elastic modulus E and Poisson's ratio of dense sand is 60 × 103 kN/m² and 0.3 respectively. Ground surface X 4 m Loose silt + Basement foundation slab 6 m * Loose silt Dense sand (i) Using factor of safety = 3, the net safe bearing capacity (in kN/m²) of the foundation is ? (ii) The foundation slab is subjected to vertical downward stresses equal to net safe bearing capacity derived in the above question (i). Using influence factor I, = 2.0, and neglecting embedment depth and rigidity corrections, calculate the immediate settlement of the dense sand layer.

Structural Analysis
Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
Section: Chapter Questions
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A multistory building with a basement is to be constructed. Top 4 m consists of loose silt, below which dense sand layer is present upto a great depth. Ground water table is at the surface. The foundation consists of the basement slab of 6 m 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 N₁ = 40 and N, = 45. For loose silt, saturated unit weight = 18 kN/m³, N₁ = 15 and N, = 20. Effective cohesion C is zero for both soils. Unit weight of water is 10 kN/m³. Neglect shape factor and depth factor. Average elastic modulus E and Poisson's ratio of dense sand is 60 × 103 kN/m² and 0.3 respectively. Ground surface X 4 m Loose silt + Basement foundation slab 6 m * Loose silt Dense sand (i) Using factor of safety = 3, the net safe bearing capacity (in kN/m²) of the foundation is ? (ii) The foundation slab is subjected to vertical downward stresses equal to net safe bearing capacity derived in the above question (i). Using influence factor I, = 2.0, and neglecting embedment depth and rigidity corrections, calculate the immediate settlement of the dense sand layer.
Transcribed Image Text:A multistory building with a basement is to be constructed. Top 4 m consists of loose silt, below which dense sand layer is present upto a great depth. Ground water table is at the surface. The foundation consists of the basement slab of 6 m 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 N₁ = 40 and N, = 45. For loose silt, saturated unit weight = 18 kN/m³, N₁ = 15 and N, = 20. Effective cohesion C is zero for both soils. Unit weight of water is 10 kN/m³. Neglect shape factor and depth factor. Average elastic modulus E and Poisson's ratio of dense sand is 60 × 103 kN/m² and 0.3 respectively. Ground surface X 4 m Loose silt + Basement foundation slab 6 m * Loose silt Dense sand (i) Using factor of safety = 3, the net safe bearing capacity (in kN/m²) of the foundation is ? (ii) The foundation slab is subjected to vertical downward stresses equal to net safe bearing capacity derived in the above question (i). Using influence factor I, = 2.0, and neglecting embedment depth and rigidity corrections, calculate the immediate settlement of the dense sand layer.
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