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<p>Silt soils in the Yellow River alluvial plain exhibit a loose structure and high compressibility, making them prone to differential settlement between new and existing subgrades in highway widening projects. This phenomenon triggers longitudinal pavement cracking, performance degradation, and compromised traffic safety. This study systematically investigated the synergistic efficacy of geogrid reinforcement and silt modified with lignin and fine recycled concrete aggregate (FRCA) through laboratory experiments and finite element modeling. Comparative analysis of three subgrade systems revealed that the composite system (five-layer geogrids + 1% lignin/40% FRCA-modified soil) delivered superior performance. The modified soil significantly enhanced unconfined compressive strength (270.64&#xa0;kPa) and shear resistance. Critically, the composite system reduced long-term (20-year) cumulative settlement to 2.07&#xa0;cm (a 30% reduction versus conventional treatment) and lateral displacement to 2.43&#xa0;cm (a 62% reduction). This work establishes a co-optimized material-structure strategy for efficient differential settlement mitigation in silt-dominated highway widening projects, with broad applicability to analogous geological settings.</p>

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Differential Settlement Control Between New and Existing Highway Subgrades in Silty Soils

  • 期刊论文

  • 发表日期：

    2025年8月21日

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  • Jian Zhang,
  • Feng Hu,
  • Qiang Gao,
  • Kuo Zhang,
  • Chuanxiao Liu,
  • Junhao Ge,
  • Zhe Ren,
  • Guangtan Cheng

摘要

Silt soils in the Yellow River alluvial plain exhibit a loose structure and high compressibility, making them prone to differential settlement between new and existing subgrades in highway widening projects. This phenomenon triggers longitudinal pavement cracking, performance degradation, and compromised traffic safety. This study systematically investigated the synergistic efficacy of geogrid reinforcement and silt modified with lignin and fine recycled concrete aggregate (FRCA) through laboratory experiments and finite element modeling. Comparative analysis of three subgrade systems revealed that the composite system (five-layer geogrids + 1% lignin/40% FRCA-modified soil) delivered superior performance. The modified soil significantly enhanced unconfined compressive strength (270.64 kPa) and shear resistance. Critically, the composite system reduced long-term (20-year) cumulative settlement to 2.07 cm (a 30% reduction versus conventional treatment) and lateral displacement to 2.43 cm (a 62% reduction). This work establishes a co-optimized material-structure strategy for efficient differential settlement mitigation in silt-dominated highway widening projects, with broad applicability to analogous geological settings.