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Abstract The compression tests are conducted on Xi?an intact and remoulded as well as artificially structural loesses under different moisture contents. Based on the principle of equivalent deformation，the equivalent stress of structural fluid is ascertained by using compressive stress difference between unsaturated and saturated loesses which have the same dry density and consolidation void ratio. The characteristics of equivalent stress of structural fluid are investigated. The research result indicates that the relationship between equivalent stress of structural fluid and stress as well as degree of saturation on Xi?an intact and remoulded as well as artificially structural loesses is power function，which is the same as that on the loess of other regions qualitatively. The variation regularity of equivalent stress of structural fluid is successfully universal. The changes of structural property and moisture content of loess as well as stress can be reflected by the equivalent stress of structural fluid；and the parameters of power function equation of equivalent stress of structural fluid are relative to moisture content and structural property as well as dry density. The equivalent stress of structural fluid under the condition of coupling of stress and moisture is calculated by the power function equation. Furthermore，effective stress and the compression curves of effective stress of unsaturated loess can be obtained.
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Received: 01 April 2010
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2011, Vol. 30 
