Regularity of relation between structural parameter and strength indexes of unsaturated loess

Based on authors' previous research achievements of structural characteristics of unsaturated loess, the regularity of relation between structural parameter and strength indexes is explored; and the question how to use structural parameter to ascertain the strength indexes of soils under different structural states is discussed too. The research indicates that the structural parameter is a corking criterion to confirm the strength indexes of soils and further expresses the internal contact with both; and there also has a very consanguineous relation between the ratio of structural parameter of unsaturated loess and influence factors of structural characteristics of soils; using the quantitative index which reflects the synthetical effect of different factors on structural characteristics of soils, named value of synthetical structural state, and considering the strength indexes of intact loess under natural water content, the strength indexes of unsaturated loess under discretional structural state can be calculated.