Abstract: The engineering characteristics of red clay soils vary significantly in different regions. This paper presents a case history of the rheological properties of the compacted Red Clay under high fill in Kunming area. The longterm rheological tests were performed on samples with different degrees of compaction and different moisture contents. The following conclusions can be obtained from the test results: when the degrees of compaction are greater than 92%, the creep properties are not affected by the degrees of compaction. Under the same degree of compaction, when the moisture content is lower than 21.26%, the creep decreases with the increase of moisture content. The secondary consolidation coefficient is introduced in the study to further characterize the effect of moisture content on the rheological properties of the Red Clay. Under the same degree of compaction, a moisture content for the minimum settlement exists between 15.83% and 21.26%. A post construction settlement analysis model was developed considering the creep effect. It was found that the moisture content for the minimum post construction was 18.33%, whereas, the optimum moisture content for the compaction was 20.77%.

Key words: compacted red clay, degree of compaction, rheological model, moisture content for minimum post construction settlement