Question

Consider the following statements:
1. 'Relative compaction' is not the same as 'relative density'.
2. Vibrofloatation is not effective in the case of highly cohesive soils.
3. 'Zero air void line' and 100% saturation line are not identical.
Which of these statements is/are correct?

• A. 1 and 2
• B. 1 and 3
• C. 2 and 3
• D. 3 along

Answer 1

The correct option is A 1 and 2

Relative compaction is defined as the ratio of the in-situ, wet density of a soil or aggregate to the test maximum wet density of the same soil or aggregate when compacted by a specific test method.
Soil densification techniques are used for reducing liquefaction hazards is to avoid large increases in pore water pressure during earthquake shaking. Vibrofloatation involves the use of a vibrating probe that can penetrate granular soil to depth of over 100 feet. The vibrations of the probe cause the grain structure to collapse thereby densifying the soil surrounding the probe. To treat an area of potentially liquefiable soil, the vibroflot is raised and lowered in a grid pattern. The relation between moisture content and dry unit weight for a saturated soil is the zero air-voids line.