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Abstract A series of confined compression tests were performed on compacted loess samples of different structures(fabrics) with the same dry density and initial testing water content. The influence of structure caused by different molding water contents on the compressive properties was analyzed for compacted loess with different initial testing water contents. The relationships between the compressibility indices and the initial structural parameter were investigated. The compression curve of saturated compacted loess was regarded as the reference state. The formula of compression curve of unsaturated compacted loess was established to determine the compressive deformation under the coupling of moisture and stress. The test results show that the molding water content has certain influence on the confining compression characteristic of compacted loess，and the extent of the influence decreases with the increase of initial testing water content. The structural influence on compressive deformation of saturated compacted loess is little. The initial structure index of compacted loess increases with increasing of molding water content or decreasing of initial testing water content. The structural change has little influence on the elastic compression indices，but both the structural yield stress and compression indices increase with the increase of initial structural parameter. The relationships of the structural yield stress and the compression indices with the initial structural parameter are normalized well and can be described with hyperbola under different initial testing water contents and molding water contents.
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Received: 16 September 2013
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2014, Vol. 33 
