岩土工程学报2025，Vol.47Issue(z2)：91-96,6.DOI:10.11779/CJGE2025S20009
软土地区复合地基支承路堤变形机理与设计方法研究
Deformation mechanism and design method of embankment supported by composite foundation in soft soil regions
摘要
Abstract
To clarify the settlement mechanisms of rigid-pile composite ground supporting embankments in soft soil regions during both construction and long-term service,and to propose an optimal pile arrangement strategy for effectively controlling pavement settlement,this study is based on an actual embankment construction project at the Xinxing Interchange section.A three-dimensional finite element model reflecting the entire process of embankment construction and consolidation is established according to the soil conditions along this section.The model is used to investigate the overall deformation patterns and settlement mechanisms under different pile arrangement methods.A comprehensive comparison of safety,settlement control effectiveness,and economic efficiency among these methods is conducted,leading to the selection of the most suitable design for the section.Furthermore,the long-term deformation and service performance of the embankment are evaluated using field monitoring data collected over the project's service life.The results indicate that compared to the conventional uniform pile layout,increasing the pile density beneath the embankment shoulder effectively limits surface settlement caused by shear stress.As the pile spacing beneath the shoulder decreases,the surface settlement pattern transitions from a depression-type settlement to a typical settlement mode.For the non-uniform pile arrangement,the ratio of pile spacing between the shoulder and centerline(s1/s2)should satisfy 1<s1/s2≤1.4;otherwise,the composite ground may experience localized excessive settlement due to insufficient vertical bearing capacity.Additionally,pile densification in the shoulder area facilitates the transfer of the embankment load to deeper soil layers,thereby reducing the risk of shallow foundation failure.关键词
路堤/复合地基/剪应力/沉降/侧向变形Key words
embankment/composite foundation/shear stress/settlement/lateral deformation分类
建筑与水利引用本文复制引用
王辉,王振宇,郑刚,王海峰,胥正一,朱宇杰,夏博洋..软土地区复合地基支承路堤变形机理与设计方法研究[J].岩土工程学报,2025,47(z2):91-96,6.基金项目
国家自然科学基金项目(52408385) （52408385）
河北省交通运输厅科技项目(201405) （201405）
