PREDICATION COLLAPSE OF GYPSEOUS SOILS DUE TO WETTING

Hussien Moula, Baydaa; K. Al- Saoudi, Namir

	PREDICATION COLLAPSE OF GYPSEOUS SOILS DUE TO WETTING
AL-TAQANI
Article 1, Volume 23, Issue 4, 2010, Pages 157-164
Authors
Baydaa Hussien Moula; Namir K. Al- Saoudi
Abstract
The gypseous soils are considered as one type of collapsible soils ; this is because the gypsum present between the soil particles provides an apparent cementation in the form of bonds that tightened the soil particles together. Upon wetting , these bonds are lost gradually leading to the collapse phenomena. The collapsibility of gypseous soils may occur under conditions that of flowing water, the flowing water will tend to wash salts present in the soil particles. The collapsing behavior of this type of soil generally occurs when the water is introduced into the soil . technically , the collapsible soil obtains some of its strength from cemented / bonding between the soil particles . in the arid region / Middle East , the Aeolian sand which was loosely placed, and upon some cementation , process may become a collapsible soil (high strength when it is dry ) . some cracking of building in this region , however, may be attributed to the introduction of water / moisture after the building is occupied .i.e. settlement of the soil after water is introduced via gardening , drainage, cooking water, bath, sewer line, septic bed, ect., from this research we get that the greater the collapse potential , the greater is the collapse and the damage to structures built on such soils. The soils with Cp less than 1 generally cause no problems to foundations . for Cp =1 to 5 , these will be moderate trouble to the foundation. For Cp≥5 , these there would be trouble if precautions are not taken in the design and construction.
Keywords
gypsum; gypseous soils; collapse soil; soaking and leaching

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