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<p>To increase highway capacity, widening and reconstruction are the foremost solutions. The challenging issue in widening design is the differential settlement control of existing and newly built subgrade. The research conducted laboratory tests on representative silty clay from the Yellow River alluvial plain under varying compaction conditions. A numerical simulation of differential settlement between old and new roadbeds under varying heights is conducted using ABAQUS, taking into account differences in foundation compaction. The results reveal that neglecting foundation compaction differences leads to significant values of differential settlement and an increased transverse slope of the road arch. Conversely, the proposed numerical calculation method, which incorporates foundation compaction differences, demonstrates a lower degree of inaccuracy. It proposes a novel and safer method for calculating the increase in the arch slope of widened roadbeds. It suggests that the increase in the arch slope of the new and old roadbeds should not exceed 0.5%. In accordance with the criteria of differential settlement control, it is necessary to implement reinforcement measures when the height of the roadbed is greater than or equal to 2&#xa0;m. The findings will be of significant importance in the subsequent calculation and evaluation of the settlement of both old and new roadbeds.</p>

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Study on Differential Settlement of Old and New Roadbed Considering Differences in Foundation Compaction in Expressway Widening Projects

  • 期刊论文

  • 发表日期：

    2026年5月6日

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  • Luchuan Chen,
  • Qiqi Lin,
  • Liang Wang,
  • Chengwei Ju,
  • Zhanyong Yao,
  • Hui Li,
  • Haoji Wei,
  • Kai Yao

摘要

To increase highway capacity, widening and reconstruction are the foremost solutions. The challenging issue in widening design is the differential settlement control of existing and newly built subgrade. The research conducted laboratory tests on representative silty clay from the Yellow River alluvial plain under varying compaction conditions. A numerical simulation of differential settlement between old and new roadbeds under varying heights is conducted using ABAQUS, taking into account differences in foundation compaction. The results reveal that neglecting foundation compaction differences leads to significant values of differential settlement and an increased transverse slope of the road arch. Conversely, the proposed numerical calculation method, which incorporates foundation compaction differences, demonstrates a lower degree of inaccuracy. It proposes a novel and safer method for calculating the increase in the arch slope of widened roadbeds. It suggests that the increase in the arch slope of the new and old roadbeds should not exceed 0.5%. In accordance with the criteria of differential settlement control, it is necessary to implement reinforcement measures when the height of the roadbed is greater than or equal to 2 m. The findings will be of significant importance in the subsequent calculation and evaluation of the settlement of both old and new roadbeds.