Drainage

Drainage

The main purpose of inserting a drainage trench inside a soil is to produce a strong permeability line due to the difference in pressure between the one present within the body of the drain (atmospheric pressure) and the overpressure of the water Which is inside the pores of the ground itself.
Due to the difference in permeability that occurs at the interface between the drainage trench and the geological half in place, triggers a filtration motion that leads to the subsidence of the groundwater and the decrease in water content in the soil. Its reduction of interstitial pressures (neutral pressures u) leads to an improvement in geotechnical properties of the soils.

In essence, an increase in soil strength characteristics is introduced, as expressed by the well-known Coulomb-Terzaghi report that expresses the soil resistor available in the soil (τ) in relation to the normal normal voltage (σ '):

Τ = C '+ σ' tg φ 'with σ' = (σ -u)

The Borgia Azio completely changed the concept of Drainage Trench by constructing the Gabbiodren, made up of a double-twisted torsion-wrapped double-twisted wire mesh with a geotextile retentor and separator and having a drainage core consisting of "pebbles" of non-recycled, impregnable, insoluble polystyrene And chemically inert to the water.
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