高液限红黏土的压实特性与路基填筑方案

doi:10.11896/cldb.19020036

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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.

Key words： red clay compaction characteristics CBR strength sandwich form Flac3D settlement

Published: 16 May 2019

CLC number:

U416.1

Fund:This work was financially supported by the National Natural Science Foundation(51478073),National Key Research and Development Project(2016YFC0802203).

About author:: Linfeng Wang, Chongqing Jiaotong University, Mountain Road, Water Transport, Transportation, Geo-logical Disaster Reduction, Chongqing Municipal University Key Laboratory, Professor, graduated from Hehai College of Chongqing Jiaotong University in December 2012, Ph.D. in Port Coast and Offshore Enginee-ring, joined Chongqing Jiaotong University in October 2009. So far, he is mainly engaged in the research and theory of traffic geological disaster reduction.
Yun Tian, in September 2017, studied in the Key Laboratory of Water Resources and Transportation Geolo-gical Disaster Reduction of Chongqing Jiaotong University, Chongqing Municipality, and a master's degree student, mainly engaged in geotechnical disease mechanism, coastal and offshore engineering research.

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Cite this article:

WANG Linfeng,TIAN Yun,ZENG Biao, et al. Compaction Characteristics of High Liquid Limit Red Clay and Subgrade Filling Scheme[J]. Materials Reports, 2019, 33(10): 1666-1670.

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http://www.mater-rep.com/EN/10.11896/cldb.19020036 OR http://www.mater-rep.com/EN/Y2019/V33/I10/1666

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