Dynamic cumulative deformation characteristics of weak expansive soil improved by silt and lime under cyclic wetting

ZHANG Ding-wen; LIU Wen-jun; HOU Jue; CHEN Jia-fu; TANG Zi-qiong

doi:10.19818/j.cnki.1671-1637.2025.04.005

Volume 25 Issue 4

Aug. 2025

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ZHANG Ding-wen, LIU Wen-jun, HOU Jue, CHEN Jia-fu, TANG Zi-qiong. Dynamic cumulative deformation characteristics of weak expansive soil improved by silt and lime under cyclic wetting[J]. Journal of Traffic and Transportation Engineering, 2025, 25(4): 71-79. doi: 10.19818/j.cnki.1671-1637.2025.04.005

Citation:

ZHANG Ding-wen, LIU Wen-jun, HOU Jue, CHEN Jia-fu, TANG Zi-qiong. Dynamic cumulative deformation characteristics of weak expansive soil improved by silt and lime under cyclic wetting[J]. Journal of Traffic and Transportation Engineering, 2025, 25(4): 71-79. doi: 10.19818/j.cnki.1671-1637.2025.04.005

Citation:

ZHANG Ding-wen, LIU Wen-jun, HOU Jue, CHEN Jia-fu, TANG Zi-qiong. Dynamic cumulative deformation characteristics of weak expansive soil improved by silt and lime under cyclic wetting[J]. Journal of Traffic and Transportation Engineering, 2025, 25(4): 71-79. doi: 10.19818/j.cnki.1671-1637.2025.04.005

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Dynamic cumulative deformation characteristics of weak expansive soil improved by silt and lime under cyclic wetting

doi: 10.19818/j.cnki.1671-1637.2025.04.005

ZHANG Ding-wen^{1, 2, 3
,
,},
LIU Wen-jun^{1, 2, 3},
HOU Jue⁴,
CHEN Jia-fu⁴,
TANG Zi-qiong¹

1.
School of Transportation, Southeast University, Nanjing 211189, Jiangsu, China
2.
Key Laboratory of Transport Industry of Comprehensive Transportation Theory (Nanjing Modern Multimodal Transportation Laboratory), Ministry of Transport, PRC, Nanjing 211100, Jiangsu, China
3.
Jiangsu Key Laboratory of Low Carbon and Sustainable Geotechnical Engineering, Nanjing 211189, Jiangsu, China
4.
Transportation Engineering Construction Bureau of Jiangsu Province, Nanjing 210017, Jiangsu, China

Funds:

National Key R&D Program 2023YFB2604800

Received Date: 2024-07-24
Accepted Date: 2025-05-06
Rev Recd Date: 2025-02-19
Publish Date: 2025-08-28

Abstract

Abstract

The physical and mechanical property and microscopic electron microscope scanning tests were conducted on improved expansive soil samples with different silt and lime content. The improvement mechanism was analyzed. The dynamic triaxial test of the improved soil was carried out using the GDS dynamic triaxial apparatus. The influence rules of different dynamic stresses, water content, and cyclic wetting times on the cumulative deformation of the improved soil were studied. A cumulative deformation prediction model of improved soil was constructed. The results show that the addition of 2.5% low-amount lime can not only enhance the mixing property of silt and expansive soil through sanding, but also improve the strength and water stability of single silt physically improved soil. The addition of silt can optimize the particle gradation of expansive soil, increase the porosity of the soil, inhibit the expansion potential of expansive soil, and improve the California bearing ratio (CBR) value of improved soil. The requirements of various indexes of highway subgrade filling can be met by employing 40% silt combined with 2.5% lime to improve expansive soil. At the initial stage of cyclic loading, the cumulative strain of the improved soil increases rapidly. After 2 000 cycles of loading, the cumulative strain of the improved expansive soil accounts for 79.3%, and then the growth rate of the cumulative strain tends to be stable, showing plastic stability. The final cumulative strain of the improved soil has a power function growth relationship with cyclic wetting times. Under the most unfavorable conditions, the final cumulative strain is less than 1.0%. The post-construction deformation meets the long-term stability requirements of the subgrade. A dynamic cumulative strain prediction model is constructed considering the influence of dynamic stress amplitude, water content, and humidification times, providing a reference for the long-term deformation prediction of silt-lime improved expansive soil subgrade.
- subgrade engineering,
- expansive soil,
- wetting cycle,
- improvement mechanism,
- cumulative deformation,
- composite improvement,
- prediction model

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References(30)

References

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Dynamic cumulative deformation characteristics of weak expansive soil improved by silt and lime under cyclic wetting

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