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Volume 41 Issue 1
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LIU Wei-zheng, ZENG Yi-jun, YAO Yong-sheng, ZHANG Jun-hui. Experimental study and prediction model of dynamic resilient modulus of compacted subgrade soils subjected to moisture variation[J]. Chinese Journal of Geotechnical Engineering, 2019, 41(1): 175-183. DOI: 10.11779/CJGE201901020
Citation: LIU Wei-zheng, ZENG Yi-jun, YAO Yong-sheng, ZHANG Jun-hui. Experimental study and prediction model of dynamic resilient modulus of compacted subgrade soils subjected to moisture variation[J]. Chinese Journal of Geotechnical Engineering, 2019, 41(1): 175-183. DOI: 10.11779/CJGE201901020
shu

Experimental study and prediction model of dynamic resilient modulus of compacted subgrade soils subjected to moisture variation

  • 1.School of Civil Engineering, Central South University, Changsha 410075, China;
    2.National Engineering Laboratory of Highway Maintenance Technology, Changsha University of Science & Technology, Changsha 410114, China;

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  • Received Date: January 20, 2018
  • Published Date: January 24, 2019
    Graphical Abstract
    • Abstract
  • The dynamic resilient modulus (MR) of subgrade soils is the key parameter used in pavement design and performance evaluation, and is significantly affected by variation of moisture content during operation. The compacted lateritic soil is used, and the test specimens are prepared using six different moisture contents and three degrees of compaction. The repeated loading triaxial tests are conducted to investigate the effects of moisture content, degree of compaction, dynamic deviator stress and confining pressure on dynamic resilient modulus, and the soil suctions of different specimens are measured using the contact filter paper method right after cyclic loading tests. The test results indicate that MR increases with the increasing confining pressure and degree of compaction, and decreases nonlinearly with the increasing dynamic deviator stress. The values of MR decrease greatly with the increasing moisture content, as moisture content increases by 4.5% from the optimum moisture content, they decrease to about 50% of the initial values, and the influences of dynamic deviator stress and compactness on MR decrease with the increasing moisture content. In addition, the relationships for both MR - moisture content and MR - degree of saturation are highly soil type-dependent, while the variation of MR with soil suction is similar for different soils. Thus by incorporating the soil suction into confining stress, a new prediction model for the resilient modulus taking into account both the stress state and the moisture content is proposed. The suitability of the proposed model is validated through the experimental data from this study and the existing literatures. Then the empirical relationships between model parameters and physical properties of soils are developed based on the statistical regression analysis performed on 13 different soils, and a good agreement between the measured and predicted values of MR obtained using the regression model parameters is found. This study may provide a simple and reliable method for
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    • References (34)
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