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<p>Differential settlement is a critical control indicator in widening expressways on soft soil foundations. However, research gaps persist regarding differential settlement under segmented widening construction. This study, based on the segmented widening of the Dongqing Expressway, investigates the effects of geogrid reinforcement, soft soil foundation replacement, and soft soil foundation piling on differential settlement during the construction and post-construction period. A two-dimensional plane model was established using ABAQUS finite element software, and the element birth/death method was used to simulate the construction sequence of widening the left-sided subgrade first, followed by the right-sided subgrade. The results indicate that under the segmented widening construction, the settlement of the subgrade settlement exhibits an asymmetric characteristic. Specifically, the maximum settlement of the left-sided subgrade during construction is 2.3 times that of the right-sided subgrade, whereas the maximum settlement of the right-sided subgrade after completion is 1.6 times that of the left-sided subgrade. From the perspective of treatment measures, geogrid reinforcement significantly improves differential settlement at the subgrade joints, achieving an improvement effect that is 4 to 7 times greater than that of the entire subgrade. Replacing the upper 3&#xa0;m of soft soil within a total depth of 15&#xa0;m increases differential settlement by 23.3%. The 14&#xa0;m piling length scheme significantly mitigates the differential settlement caused by the segmented widening on both sides during construction period. Specifically, the settlement of the left-sided subgrade is merely 0.8&#xa0;cm greater than that of the right-sided subgrade, representing a reduction of 70.2%. Moreover, the maximum differential settlement during the construction and post-construction period was reduced by 62.1% and 43.6%, respectively. This study provides a foundational basis for establishing settlement control criteria in the context of segmented widening. Furthermore, the impact of asymmetric settlement characteristics on pavement performance represents a critical area for future research.</p>

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Mitigation of differential settlement in segmented widening of an expressway: geogrid reinforcement, soft soil replacement, and piling

  • 期刊论文

  • 发表日期：

    2025年6月21日

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  • Xiaobin Xu,
  • Jinghan Xu,
  • Mulian Zheng,
  • Bin Yang,
  • Meikun Yang

摘要

Differential settlement is a critical control indicator in widening expressways on soft soil foundations. However, research gaps persist regarding differential settlement under segmented widening construction. This study, based on the segmented widening of the Dongqing Expressway, investigates the effects of geogrid reinforcement, soft soil foundation replacement, and soft soil foundation piling on differential settlement during the construction and post-construction period. A two-dimensional plane model was established using ABAQUS finite element software, and the element birth/death method was used to simulate the construction sequence of widening the left-sided subgrade first, followed by the right-sided subgrade. The results indicate that under the segmented widening construction, the settlement of the subgrade settlement exhibits an asymmetric characteristic. Specifically, the maximum settlement of the left-sided subgrade during construction is 2.3 times that of the right-sided subgrade, whereas the maximum settlement of the right-sided subgrade after completion is 1.6 times that of the left-sided subgrade. From the perspective of treatment measures, geogrid reinforcement significantly improves differential settlement at the subgrade joints, achieving an improvement effect that is 4 to 7 times greater than that of the entire subgrade. Replacing the upper 3 m of soft soil within a total depth of 15 m increases differential settlement by 23.3%. The 14 m piling length scheme significantly mitigates the differential settlement caused by the segmented widening on both sides during construction period. Specifically, the settlement of the left-sided subgrade is merely 0.8 cm greater than that of the right-sided subgrade, representing a reduction of 70.2%. Moreover, the maximum differential settlement during the construction and post-construction period was reduced by 62.1% and 43.6%, respectively. This study provides a foundational basis for establishing settlement control criteria in the context of segmented widening. Furthermore, the impact of asymmetric settlement characteristics on pavement performance represents a critical area for future research.