A footing 2.5 m square carries a gross foundation pressure of 400 kPa at a depth of 1 m in a sand soil. The saturated and moist unit weights of the sand are 20 and 17 kN/m², respectively. The shear strength parameters are c' =0 and Ø'= 40°. Determine the factor of safety with respect to shear failure for the following cases: (a) The water table is 5 m below ground level. (b) The water table is 1 m below ground level. (c) The water table is 2 m below ground level. (d) The water table is at ground level and there is seepage vertically upwards under hydraulic gradient i =0.2. Use the Terzaghi bearing capacity equation and assume the bearing capacity factors N, and N, equal 65 and 95, respectively.
A footing 2.5 m square carries a gross foundation pressure of 400 kPa at a depth of 1 m in a sand soil. The saturated and moist unit weights of the sand are 20 and 17 kN/m², respectively. The shear strength parameters are c' =0 and Ø'= 40°. Determine the factor of safety with respect to shear failure for the following cases: (a) The water table is 5 m below ground level. (b) The water table is 1 m below ground level. (c) The water table is 2 m below ground level. (d) The water table is at ground level and there is seepage vertically upwards under hydraulic gradient i =0.2. Use the Terzaghi bearing capacity equation and assume the bearing capacity factors N, and N, equal 65 and 95, respectively.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:A footing 2.5 m square carries a gross foundation pressure of 400 kPa at a depth of 1 m in a sand soil. The saturated
and moist unit weights of the sand are 20 and 17 kN/m², respectively. The shear strength parameters are c' =0 and
Ø'= 40°. Determine the factor of safety with respect to shear failure for the following cases:
(a) The water table is 5 m below ground level.
(b) The water table is 1 m below ground level.
(c) The water table is 2 m below ground level.
(d) The water table is at ground level and there is seepage vertically upwards under hydraulic gradient i =0.2.
Use the Terzaghi bearing capacity equation and assume the bearing capacity factors N, and N, equal 65 and 95,
respectively.
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