![A 3 m high vertical earth retaining wall retains a dry granular backfill with angle of internal friction of 30° and unit weight of 20 kN/m3](https://www.gkseries.com/blog/wp-content/uploads/2023/09/A-3-m-high-vertical-earth-retaining-wall-retains-a-dry-granular-backfill-with-angle-of-internal-friction-of-30°-and-unit-weight-of-20-kN-m3.jpg)
Q. A 3 m high vertical earth retaining wall retains a dry granular backfill with angle of internal friction of 30° and unit weight of 20 kN/m3. If the wall is prevented from yielding (no movement), the total horizontal thrust (in kN per unit length) on the wall is
(A) 0 (B) 30 (C) 45 (D) 270
Ans: 45