Relating to spread footing foundation design, calculate the value for the soil rigidity index, Ir, given the indicated conditions, to use with the extended bearing capacity equation:(a) Soil modulus of elasticity is 25,000 kPa, Poisson’s ratio is 0.42, soil unit weight is 18 kN/m3, shear strength values are cohesion= 36 kPa , and the angle of internal friction is 22°. Find Ir for a point 3 m below the soil surface.(b) The modulus of elasticity is to be estimated from the results of a consolidation test where Cc is 0.35 over the pressure range between 50 and 100 kN/m2 and the value of e0 is 1.40. Poisson’s ratio is 0.30. In place, the soil has a unit weight of 17 kN/m3, a cohesion equal to 60 kN/m2, and an angle of internal friction of 15°. Find Ir for a point 4 m below the soil surface.
Relating to spread footing foundation design, calculate the value for the soil rigidity index, Ir, given the indicated conditions, to use with the extended bearing capacity equation:
(a) Soil modulus of elasticity is 25,000 kPa, Poisson’s ratio is 0.42, soil unit weight is 18 kN/m3, shear strength values are cohesion= 36 kPa , and the angle of internal friction is 22°. Find Ir for a point 3 m below the soil surface.
(b) The modulus of elasticity is to be estimated from the results of a consolidation test where Cc is 0.35 over the pressure range between 50 and 100 kN/m2 and the value of e0 is 1.40. Poisson’s ratio is 0.30. In place, the soil has a unit weight of 17 kN/m3, a cohesion equal to 60 kN/m2, and an angle of internal friction of 15°. Find Ir for a point 4 m below the soil surface.
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