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Analysis of the Effects of Different Filling Materials on the Deformation of a Widened Subgrade

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Abstract

Subgrade filling materials affect the settlement in expressway widening projects with a soft soil foundation. On-site monitoring and finite element simulation are used to analyze and compare the settlement and lateral displacement of a lime soil subgrade and mixed gravel and lime soil subgrade. The results show that the trends of the foundation surface settlement, the lateral displacement of the new subgrade foundation at the slope foot, and the newly widened subgrade layered settlement are the same for the two subgrade types. However, the settlement and lateral displacement values are larger for the mixed gravel and lime soil subgrade than for the lime soil subgrade. Moreover, the foundation surface settlement difference between the two subgrade types increases with the distance from the slope foot of the new subgrade. The lateral displacement difference changes during the post-construction period with the depth from the foundation surface and operation time, and the subgrade layered settlement difference changes with the subgrade’s longitudinal depth and lateral position. The research results provide information on the subgrade settlement during expressway widening projects.

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Acknowledgements

The authors are grateful for the financial support of the Department of Communications of Heilongjiang Province science and technology project of China (grant no. 2019HLJ0073).

Funding

Research on Subgrade widening technology of Beijing-Harbin Expressway Reconstruction and Expansion Project based on differential settlement control, Grant no. 2019HLJ0073.

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Authors and Affiliations

  1. School of Civil Engineering, Northeast Forestry University, Harbin, China

    Liang Yang, Wenyuan Xu & Yuxuan Wu

  2. China Railway Construction Investment Group Corporation Limited, Beijing, China

    Keke Li & Pengwei Han

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  1. Liang Yang
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Correspondence to Wenyuan Xu.

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Yang, L., Xu, W., Li, K. et al. Analysis of the Effects of Different Filling Materials on the Deformation of a Widened Subgrade. Int J Civ Eng 21, 1679–1695 (2023). https://doi.org/10.1007/s40999-023-00858-w

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  • DOI: https://doi.org/10.1007/s40999-023-00858-w

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