During plate Load test, the settlement of a 35 cm plate is found to be 2 cm in a cohesive soil, then the settlement of square footing of 85 cm side under same Loading conditions is
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- a square footing with a size of 10 ft by 10 ft is located 8ft below the ground surface. the subsoil consists of a thick deposit of stiff cohesive soil with an unconfined compressive strength equal to 3600lb/ft2. The soils units weight is 128lb/ft3. calculate the ultimate bearing capacity.A plate load test was conducted on sandy soil. The plate used is 81 cm square. The ultimate load per unit area (qu) is 720 kN/m^2. What is the maximum allowable load of a 3m square footing? Use factor of safety of 3.Problem No. 2A circular footing with 1.50m diameter is to be constructed 1.22m below the ground surface. Thesubsoil consists of a uniform deposit of dense soil having the following strength parameters. Theground water table is at great depth and its effect can be ignored.Angel of Internal Friction = 25.00°Unconfined compressive strength = 96 kN/m3Unit weight of Soil = 201.12 kN/m3a) Compute the ultimate bearing capacity of the soil using vesic equation.b) Compute the gross allowable bearing capacity of the soil using a factor of safety of 3.00c) Compute the total allowable load that the footing can carry.
- A single-column highway bridge bent is to be supported on a square spread footing founded onsand. The bottom of this footing will be 1.8 m below the adjacent ground surface. The factoredvertical compressive design load, Pu, plus the factored weight of the foundation is 4,500 kNwhen computed using the AASHTO load factors. The soil has c′ = 0 and f′ = 31° (basedon empirical correlations with SPT data) and g = 17.5 kN/m3 . The groundwater table is ata great depth. Using the LRFD method, determine the required footing width, B, to satisfybearing capacity requirements.A spread footing supported on a sandy soil has been designed using ASD to support a certaincolumn load with a factor of safety of 2.5 against a bearing capacity failure. However, there issome uncertainty in both the column load, P, and the friction angle, f. Which would have thegreatest impact on the actual factor of safety: an actual P that is twice the design value, or actualf that is half the design value? Use bearing capacity computations with reasonable assumedvalues to demonstrate the reason for your response.An 800 kN column load will be supported on a square spread footing foundation bearing on the surface of a cohesionless soil deposit. The soil has a unit weight of 20 kN/m3 and an angle of internal friction of 34°. The rigidity index for the affected soil zone is 75. Assume that the groundwater table is very deep. Determine the required size footing, using the extended bearing capacity equation with a factor of safety of 3.
- A 2.0 m 2.0 m square pad footing will be placed in a normally consolidated clay soil to carry a column load Q. The depth of the footing is 1.0 m. The soil parameters are: c = 0, =26, = 19 kN/m3, cu = 60 kN/m2 (=0 condition). Determine the maximum possible value for Q, considering short-term and long-term stability of the footing.A circular footing with a 1.5 m diameter is to be constructed 1.2 m below the ground surface. Thesubsoil consists of a uniform deposit of dense soil having the following strength parameters.Angle of internal friction = 25o, Nc = 24.1 ; Nq =13.1 ; N = 9.1Unconfined compressive strength = 96 kN/m2Unit weight of soil = 20.12 kN/m3The ground water table is at great depth and its effect can be ignored.a) Compute the Ultimate bearing capacity of the soil.b) Compute the gross allowable bearing capacity of the soil using a factor of safety of 3.c) Compute the allowable load the footing could carryA 2.0 m x 2.0 m square pad footing will be placed in a normally consolidated clay soil to carry acolumn load Q. The depth of the footing is 1.0 m. The soil parameters are: c’= 0, ϕ’= 26º, γ =19kN/m3, and cu = 60 kN/m2. Determine the maximum possible value for Q, considering short-termand long-term stability of the footing
- A strip footing is to be designed to carry a load of 800 kN/m at the depth of 7m in a gravelly sand . the appropriate shear strenght parameter are c =0 and φ=40o. Determine the width of the footing if a factor of safety 3 against shear failure is specified and assuming that that the water table may raise to foundation level.Above the water table the unit weight of the sand is 17 kn/m3 and below the water table the saturated unit weight is 20 kN/m3A 3 m * 3 m footing is to be built on the surface of a 15 m thick layer of unsaturated sand.The sand is underlain by a very dense gravel layer. The water table is at a great depth. The sandis relatively uniform and in situ testing indicates it has a constrained modulus of 10 MPa. Thefooting load is 200 kN. Compute the settlement under the center of the footing.A 3 ft square footing is founded at a depth of 2.5 ft on saturated clay and carries an unfactoredvertical column load of 65 k. The underlying clay has an undrained shear strength of 1,500 lb/ft2.Compute the allowable shear load this column can carry using ASD with a sliding factor ofsafety of 1.5.