Surcharge loading required to be placed on the horizontal

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Surcharge loading required to be placed on the horizontal back fill of a smooth retaining vertical wall so as to completely eliminate crack is

1. 2c
2. 2ck_a
3. 2c√ k_a
4. 2c/√ k_a

Correct Option: D

Surcharge load

=	2c
	√K_a