Soil Mechanics and Foundation
A retaining wall 6m high supports a backfill with a surcharge angle of 10°. The back of the wall is inclined to the vertical at a positive batter angle of 5°. If the angle of wall friction is 7°, then the resultant active earth pressure will act at a distance of 2 m above the base and inclined to the horizontal at an angle of

10°
17°
12°

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Soil Mechanics and Foundation
With the increase in the amount of compaction energy

optimum water content increases but maximum dry density decreases
both optimum water content and maximum dry density increase
optimum water content decreases but maximum dry density increases
both optimum water content and maximum dry density decrease[ES 93]

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