Volume 25 Issue 5
Oct.  2025
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HUANG Xuan-jia, LIU Wei-zheng, CHEN Zhao-feng. Resilient and accumulative plastic deformation characteristics of subgrade lateritic soil under different loading modes and moisture content[J]. Journal of Traffic and Transportation Engineering, 2025, 25(5): 145-158. doi: 10.19818/j.cnki.1671-1637.2025.05.011
Citation: HUANG Xuan-jia, LIU Wei-zheng, CHEN Zhao-feng. Resilient and accumulative plastic deformation characteristics of subgrade lateritic soil under different loading modes and moisture content[J]. Journal of Traffic and Transportation Engineering, 2025, 25(5): 145-158. doi: 10.19818/j.cnki.1671-1637.2025.05.011
shu

Resilient and accumulative plastic deformation characteristics of subgrade lateritic soil under different loading modes and moisture content

doi: 10.19818/j.cnki.1671-1637.2025.05.011
  • 1.

    School of Civil Engineering, Central South University, Changsha 410075, Hunan, China

  • 2.

    National Engineering Research Center of High-speed Railway Construction Technology, Central South University, Changsha 410075, Hunan, China

  • 3.

    College of Civil Engineering and Architecture, Quzhou University, Quzhou 324000, Zhejiang, China

Funds:

National Natural Science Foundation of China 52578541

Science and Technology Research and Development Program Project of China Railway Group Limited 2021-Special-08

Science and Technology Research and Development Project of China State Railway Group Co., Ltd. L2023G002

Fundamental Research Funds for the Central Universities of Central South University 2025ZZTS0320

Postgraduate Scientific Research Innovation Project of Hunan Province CX20250294

More Information
  • Corresponding author: LIU Wei-zheng (1982-), male, associate professor, PhD, liuwz2011@csu.edu.cn
  • Received Date: 2025-03-31
  • Accepted Date: 2025-08-25
  • Rev Recd Date: 2025-06-08
  • Publish Date: 2025-10-28
    Abstract
  • To investigate the resilient and accumulative plastic deformation laws of in-service lateritic soil subgrades in humid and rainy areas under different dynamic load conditions and wetting effects, dynamic triaxial tests were conducted under different moisture content, loading modes, dynamic stress amplitudes, and confining pressures. The influences of the single-stage, intermittent, and multi-stage loading, wetting amplitude, and stress level on the resilient strain, dynamic resilient modulus, and accumulative plastic strain of lateritic soil samples were analyzed. The analysis results indicate that under single-stage loading conditions, the resilient strain exhibits a characteristic of nonlinear decay which is fast first and then slow with the increase of loading times, while the accumulative plastic strain shows a rapid increase first and then tends to stabilize. The effect of dynamic stress amplitude on the resilient strain and accumulative plastic strain of lateritic soil increases with the increase of moisture content and decreases with the increase of confining pressure. When the moisture content increases from the optimum moisture content (OMC) to OMC+4.5%, the resilient strain and accumulative plastic strain increase by 2.99 times and 59%, respectively. When the confining pressure increases from 30 to 90 kPa, the resilient strain and accumulative plastic strain decrease by 52% and 38%, respectively. A fuzzy multiple regression model considering the uncertainty of critical dynamic stress was established based on the structural element theory, which can well reflect the relationships of critical dynamic stress with moisture content and confining pressure. The accumulative plastic strain under multi-stage loading is lower than that under single-stage loading at the same stress level. The low-stress-level loading in the first stage significantly reduces the accumulative plastic strain after the second, third, and fourth stages of loading. When the dynamic deviatoric stress is below 30 kPa, the differences in resilient and accumulative plastic strain between single-stage loading and intermittent loading are small. When the dynamic deviatoric stress is higher than 90 kPa, the plastic strain under single-stage loading is significantly higher than that under intermittent loading. The research results can provide a reference for the toughness design and long-term service performance evaluation of subgrades in lateritic soil areas.

     

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