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Collapsible Soil and Its Treatment

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Questions and Answers

What is a collapsible soil?

A soil that exhibits a large decrease in strength at moisture contents approaching saturation (correct)

A soil that has no impact on volume change when saturated

A soil that exhibits a large increase in strength at moisture contents approaching saturation

A soil that remains stable and unaffected by moisture contents approaching saturation

What are collapsible soils also known as?

Metastable soils (correct)

Unstable soils

Solid soils

Stable soils

What factors are needed to produce collapse in a soil structure?

Low moisture content and high net total stress

High net total stress and stable structure

Stable fabric and low net total stress

Open, partially unstable, unsaturated fabric and high net total stress (correct)

In what type of regions are collapsible soils typically encountered?

Arid and semi-arid regions Signup and view all the answers

What is primarily related to the collapse phenomenon of collapsible soils?

The open structure of the soil Signup and view all the answers

What is the effect of the addition of water to collapsible soil?

It reduces the bonding or cementing agent, causing intergranular contacts to fail in shear Signup and view all the answers

What is the primary factor contributing to the collapse of weak soils when water is added?

Thickness of the collapsible strata Signup and view all the answers

Which of the following is NOT a factor influencing the amount of collapse in weak soils when water is provided?

Type of soil particles Signup and view all the answers

How can the load-bearing capacity of weak soils be improved?

Using stronger footings to withstand possible differential settlements Signup and view all the answers

What characteristic makes collapsible soils unsuitable for any types of foundations or pavements in their original or natural conditions?

Low bearing capacity when wetted Signup and view all the answers

What is essential once a soil shows indications of collapse potential?

Direct measurement of the magnitude of collapse using laboratory tests Signup and view all the answers

Which method has shown significant reduction in the settlement of collapsible soils?

Soil replacement Signup and view all the answers

In what cases are strip foundations commonly used?

When the depth of collapsing soil is shallow Signup and view all the answers