In a reinforced concrete retaining wall, shear key is provided if

1.	In a reinforced concrete retaining wall, shear key is provided if
A.	shear stress in the vertical component is excess
B.	shear force in the toe slab is less than that in the heel slab
C.	Retaining wall is not safe against sliding
D.	shear force in the toe slab is more than that in the heel slab
E.	Retaining wall is not safe against over-turning
Answer» D. shear force in the toe slab is more than that in the heel slab

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