Abstract: Red clay can not be used as embankment filler directly due to its water-sensitive property. In engineering, it can be improved by adding gravel and other coarse aggregates. However, it is difficult to mix soil and gravel uniform. In order to study the compaction characteristics of red clay, standard compaction and CBR strength tests were carried out in this paper. The test results showed that the wet compaction results of red clay were more suitable for guiding engineering practice, and its compaction curve showed double peak characteristics. The second peak was the real maximum dry density, and its corresponding moisture content was the optimal moisture content. The moisture content and compression of red clay were explored. The relationship between compactness and CBR strength was not positively correlated with strength. The moisture content corresponding to the maximum CBR strength was about 5% higher than the optimal moisture content. Under the effect of suitable moisture content and appropriate compaction work, the CBR strength and compactness of red clay can meet the requirements of highway roadbed specifications, which makes it possible for red clay to be used as roadbed filler. Therefore, the “sandwich form” red clay-gravel filling scheme was proposed. Flac3D software was used to simulate several roadbed filling modes under different working conditions, and the vertical settlement was analyzed. The numerical simulation and post-construction settlement monitoring results showed that the “Sandwich form” red clay-gravel filling method can achieve the requirements of highway roadbed settlement standards.
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2019, Vol. 33 
