Question

A 6 m wall retains a dry sand backfill with a unit weight of 19 kN/mº, specific gravity (G) 2.65, an angle of internal friction of 35° and a porosity of 31%. The backfill is fully drained through weep holes What is the magnitude of the backfill force on a 1 m wide slice of wall and its location from its heel, if it is not allowed to deflect?

Answer 1

The magnitude of the backfill force on a 1 m wide slice of wall is 29.9 kN.

Step-by-step explanation:

To find the magnitude of the backfill force on a 1 m wide slice of wall, we can use the equation:

F = γ * h * w * cos(φ),

where F is the force, γ is the unit weight of the backfill, h is the height of the slice, w is the width of the slice, and φ is the angle of internal friction.

In this case, γ = 19 kN/m³, h = 6 m, w = 1 m, and φ = 35°.

Therefore, the magnitude of the backfill force on a 1 m wide slice of wall is: F = (19 kN/m³) * (6 m) * (1 m) * cos(35°) = 29.9 kN.