Question

The soil used in the backfill should have particles of not more than _____ passing 63 μm sieve.

(a) 10%

(b) 20%

(c) 30%

(d) 40%

This question was addressed to me during an online exam.

This interesting question is from Reinforced Earth in section Reinforced Earth and Geotextiles of Geotechnical Engineering II

Answer 1

Right choice is (a) 10%

Easiest explanation: The soil used in the backfill should predominantly be coarse-grained and it is proposed that not more than 10% of the particles should pass 63 μm sieve. The first level of the reinforced strips is placed at the ground level.