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Foundation Engineering

Soil Exploration

Consider the ...

Question

Consider the following statements:
Prevention or elimination of swelling can be brought by
1. providing an impervious apron around the structure
2. pre-wetting the ground to a moisture content equal to equilibrium moisture content
3. packing downward loads large enough to exceed swelling pressures
4. chemically stabilizing the soil with lime
Which of these statements are correct?

A

1 and 2

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B

1 and 3

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C

2 and 3

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D

1, 2, 3 and 4

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Solution

The correct option is D 1, 2, 3 and 4
Treatment of expansive soils
• Pre-wetting a site to increase the moisture content can eliminate an expansive soil problem if the high moisture content can be maintained.
• Vertical or horizontal moisture-loss barriers are installed in only a few cases in the past, but their use is becoming more frequent. The combined effect of a moistened sub-grade and moisture barriers, when applied correctly, can be very successful. The application of moisture treatment coupled with proper degrees of compaction has been utilized extensively.

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