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What is desiccated soil?

Abstract. Desiccation in clay soils can result in shrinkage of the soil and subsidence of the ground; this may lead to damage to buildings. As the soil re-hydrates, it can swell, resulting in ground heave; this may also cause damage to buildings.

What does desiccation mean in science?

Desiccate: To remove the moisture from a thing that normally contains moisture, such as a plant; to dry out completely; to preserve by drying. The process of desiccating a thing is called desiccation; an agent used to bring about desiccation is called a desiccant or a desiccator.

What causes soil desiccation?

Damage may occur as tree roots take up water from the soil, causing the ground to dry out and shrink. Shrinkage can cause uneven settlement leading to subsidence at the surface. This occurs predominantly during spring and summer.

How can you tell if soil is desiccated?

33), seeks to establish a relationship between the moisture content and index properties of the soil. Richard suggested that a soil might be desiccated if the moisture content is less than (a) 0.4 x LL or (b) 2% above the PL.

How can we prevent soil desiccation?

There are three ways that landscapers and homeowners can help prevent winter plant desiccation:

  1. Ensure plants are properly hydrated through periods of low precipation, either with irrigation or moisture-management products.
  2. Prevent Moisture-Loss with Chemical Barriers.
  3. Prevent Moisture Loss with Physical Barriers.

What is modified plasticity index?

The Modified Plasticity Index (I’p) is defined as the Plasticity Index (Ip) of the soil multiplied by the percentage of particles less than 425µm. Modified Plasticity Index is related to volume change potential as shown in Table 1.

What does desiccation mean in plants?

Desiccation, in a broad sense, is what happens when a great deal of moisture is removed from a substance. As a part of their normal respiratory functions, plants tend to release some moisture, but it’s usually not a problem since they’re also bringing in new fluids from their roots at the same time.

What is process of desiccation?

Desiccation is the state of extreme dryness, or the process of extreme drying. In biology and ecology, desiccation refers to the drying out of a living organism. Microorganisms cannot grow and divide when desiccated, but can survive for certain periods of time, depending on their features.

How are desiccation cracks formed?

Desiccation structures originate as shrinkage cracks formed by the evaporation of water from the surface of clay-rich sediment. Previously called mud cracks, they are of subaerial origin, and are caused by the slow drying-out of muddy sediments which have been exposed to the action of sun and wind.

How deciduous trees prevent desiccation?

Nutrient resorption from senescing leaves is an important mechanism of nutrient conservation in temperate deciduous forests. This strategy prevented extensive leaf desiccation during the drought and successfully averted large nutrient losses caused by leaf desiccation.

What is desiccation in trees?

Winter desiccation is a common type of winter injury that occurs when the amount of water lost by the foliage exceeds the amount picked up by the roots. During the growing season when trees are in full foliage, large amounts of water are lost through their leaves.

What are the properties of a desiccated soil?

• Properties of desiccated soils • Desiccation theory for soft cohesive soils • Desiccation Characteristics of soft cohesive soils • Desiccation cracks • Swelling of desiccated clays • Identification of desiccated clays • Case history 3. Desiccated soils • Desiccation means To make or become free of moisture, dry (out), dehydrate.

What is the desiccation theory for soft cohesive soils?

DESICCATION THEORY FOR SOFT COHESIVE SOILS • The theory provides, for a soft layer undergoing consolidation and desiccation, information about the amount and time rate of settlement, the distribution of pore water pressure and void ratio at various times, and depth and volume of cracks with time.

How is desiccation cracking of soil 885 energy consuming?

Desiccation cracking of soils 885. cracking, by creating new solid surfaces, is an energy consuming process. Consider an infinite slab subjected to a horizontal two-dimensional constraint while it dries. If the tensile stress at a given point is isotropic, then the sample tends to crack along several planes of failure.

Where are desiccation resistant organisms found on Earth?

Terrestrial Environments Desiccation-resistant terrestrial cyanobacteria have widespread occurrence. They may be found growing on bare surfaces (rocks, trees, buildings, and soils) or several millimeters within more or less soft diaphanous substrates (soils, sandstone, and limestone). Some species actively bore into the rock substrate.