56.
If p₁ and p₂ are mutually perpendicular principal stresses acting on a soil mass, the normal stress on any plane inclined at angle θ° to the principal plane carrying the principal stress p₁, is:

59.
The thickness of base slab of a retaining wall generally provided, is

60.
Bottom bars under the columns are extended into the interior of the footing slab to a distance greater than

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