Abstract：Research purposes: The stress state and the rate of water content of the loess is corresponding to the special soil structure． That is to say the microcosmic structure variation results in the change of the macroscopical mechanics． Under the joint action of loading and moistening，the natural structure of the loess will be damaged and there will be collapse deformation． It is important to explore the variation laws of the structure and the mechanics characteristic of stress － strain relation and the moistening deformation under the joint action of the loading and moistening．
Research conclusions: The variation law of stress － strain with the different rates of water content and the deformation due to the moistening，consolidation and shearing reflect the constitutive damage law of the soil body． On consideration of the damage of the soil body due to the moistening and loading，using the non － linear constitutive model for the constitutive variation can describe the relation curve between the strain softening and hardening stress － strain to realize the uniformity of the constitutive property and the research on the constitutive model．
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2012, Vol. 29 
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