What is Collapsibility of soil?

Collapsible soils are defined as any unsaturated soil that goes through a. radical reammgement of particles and greatly decreases in volume upon wetting, additional loading, or both. Typically these soils are found in arid or semiarid regions and have a loose soil structure, Le.

How do you know if soil is collapsible?

Collapsible soils are generally associated with an open structure formed by sharp grains, low initial density, low natural water content, low plasticity, relatively high stiffness and strength in the dry state, and often by particle size in the silt to fine sand range (Mitchell and Soga 2005).

What is Collapsibility?

1. collapsible – capable of collapsing or being collapsed; “a collapsible boat” collapsable. noncollapsable, noncollapsible – not capable of collapsing. Based on WordNet 3.0, Farlex clipart collection.

What is collapse settlement?

The collapse settlement is a hazardous geotechnical phenomenon that can damage the dams and their equipment. Previous studies indicate that most soil types can be subjected to collapse [6,7,8,9,10]. Therefore, they suggested that wetting the soil leads to strength reduction of the particles.

What happens to collapsible loess soil under load?

When matric suction reduces (with increased degree of saturation) under load, compression occurs and shear strength reduces in collapsible loess soils. Houston et al. (2001), for example, provide a range of SWCCs for collapsible loess soils from around the world.

Which is the best example of a collapsible soil?

Numerous soil types fall in the general category of collapsible soils, including loess, a well-known aeolian deposit, present throughout most of Indiana. Loess is characterized by relatively low density and cohesion, appreciable strength and stiffness in the dry state, but is susceptible to significant deformations as a result of wetting.

What are the characteristics of a loess soil?

Loess is characterized by relatively low density and cohesion, appreciable strength and stiffness in the dry state, but is susceptible to significant deformations as a result of wetting. Cases of wetting induced collapse in loess type soils have been documented in natural deposits and in man-made fills.

Can a double oedometer be used to measure collapsibility of soil?

They may be used to gain an initial assessment of the degree of collapsibility of a soil but cannot be considered a substitute for laboratory determination of the collapse potential. For this purpose the double oedometer test has been found to be an effective method for measuring the collapse potential of compacted soils.