Question

A retaining wall of height H with smooth vertical backface supports a backfill inclined at angle $\beta$ with the horizontal. The backfill consists of cohesionless soil having angle on internal friction $\varphi$. If the active lateral thrust acting on the wall is $P_a$ which one of the following statements is TURE?

• A. $P_a$ acts at a height H/3 from the base of the wall and at an angle $\beta$ with the horizontal
• B. $P_a$ acts at a height H/2 from the base of the wall and at an angle $\varphi$ with the horizontal
• C. $P_a$ acts at a height H/2 from the base of the wall and at an angle $\beta$ with the horizontal
• D. $P_a$ acts at a height H/3 from the base of the wall and at an angle $\varphi$ with the horizontal

Answer 1

The correct option is A $P_a$ acts at a height H/3 from the base of the wall and at an angle $\beta$ with the horizontal


Active thrust act at a height H/3 from the base of the wall and at an angle equal to backfill inclination.