(a) Determine the wall loading that can be carried by a long footing 1 m wide and located 1.5 m below the ground surface. Strength tests indicate that the soil has a cohesion of 58 kN/m2 and an angle of internal friction of20°. The total soil unit weight is 18 kN/m3. The soil above the footing is well compacted, and the depth factors will apply. The soil rigidity index is greater than the critical index. The water table is expected to rise to the ground surface. Use a factor of safety equal to 3 with the extended general bearing capacity equation.(b) Recalculate the design bearing capacity assuming the depth factors do not apply. What percentage change in bearing capacity does this represent (compared to the answer in part a)?(c) Recalculate the bearing capacity for the conditions of part a but where the water table is very deep.
(a) Determine the wall loading that can be carried by a long footing 1 m wide and located 1.5 m below the ground surface. Strength tests indicate that the soil has a cohesion of 58 kN/m2 and an angle of internal friction of
20°. The total soil unit weight is 18 kN/m3. The soil above the footing is well compacted, and the depth factors will apply. The soil rigidity index is greater than the critical index. The water table is expected to rise to the ground surface. Use a factor of safety equal to 3 with the extended general bearing capacity equation.
(b) Recalculate the design bearing capacity assuming the depth factors do not apply. What percentage change in bearing capacity does this represent (compared to the answer in part a)?
(c) Recalculate the bearing capacity for the conditions of part a but where the water table is very deep.
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