预制管桩处治高速公路拓宽软土路堤附加荷载传递规律与变形特性  

Additional load transfer law and deformation characteristics of prefabricated pipe pile in widening soft soil embankment of expressway

作　　者：刘文俊 章定文[1,2,3] 于春江 李涛 张自萌 LIU Wenjun;ZHANG Dingwen;YU Chunjiang;LI Tao;ZHANG Zimeng(School of Transportation,Southeast University,Nanjing 211189,China;Key Laboratory of Transport Industry of Comprehensive Transportation Theory(Nanjing Modern Multimodal Transportation Laboratory),Ministry of Transport,Nanjing 211100,China;Jiangsu Key Laboratory of Low Carbon and Sustainable Geotechnical Engineering,Nanjing 211189,China;Anhui Transportation Holding Group Co.,Ltd,Hefei 230092,China)

机构地区：[1]东南大学交通学院,南京211189 [2]交通运输部综合交通运输理论交通运输行业重点实验室(南京现代综合交通实验室),南京211100 [3]江苏省低碳与绿色岩土工程重点实验室,南京211189 [4]安徽省交通控股集团有限公司,合肥230092

出　　处：《东南大学学报(自然科学版)》2025年第2期536-543,共8页Journal of Southeast University:Natural Science Edition

基　　金：国家自然科学基金资助项目(52078129);安徽省交通控股集团科技资助项目(JKKY‑2021‑19);综合交通运输理论交通运输行业重点实验室(南京现代综合交通实验室)开放课题资助项目(MTF2023009).

摘　　要：为揭示预制管桩处理高速公路改扩建工程软土路堤附加荷载传递规律和沉降变形特性,建立了高速公路改扩建工程全过程三维有限元仿真模型,探讨了新路堤填筑引起的地基附加应力分布特征和主要沉降变形来源。结果表明:预制管桩能够将路堤荷载有效传递至深部持力层,减小地基浅层软土层中的附加应力,地基主要受力变形区下移至桩端下卧层;预制管桩约束了新路堤的下移趋势,新路堤荷载向老路堤下部地基偏移,老路边坡内侧沉降变形是新老路堤差异沉降的主要来源;预制管桩加固软土地基能够有效降低新路堤沉降变形、新老路堤差异沉降及工后横坡变化率。研究成果可为预制管桩处理高速公路改扩建工程的优化设计提供理论依据。To elucidate the additional load transfer mechanisms and settlement deformation characteristics of soft soil embankments in highway reconstruction and expansion projects treated with precast pipe piles,a three‑dimensional finite element simulation model encompassing the entire process of highway reconstruction and expansion was developed.The study examined the distribution characteristics of foundation additional stress as well as the primary sources of settlement deformation induced by new embankment filling.The findings indicate that precast pipe piles effectively transmit embankment loads to deeper bearing layers,thereby mitigating additional stress within shallow soft soil layers of the foundation.Notably,the main stress deformation zone of the foundation moves down to the underlying stratum of the pile end.Furthermore,these prefabricated elements counteract downward displacement associated with new embankments while redistributing their loads onto existing foundations beneath old embankments.Consequently,the settlement deformation of the inner side of the old road slope is the main source of the differential settlement of the new and old embankments.The reinforcement strategy utilizing precast pipe piles significantly diminishes settlement deformations in new embankments,reduces differential settlements between new and old structures,and stabilizes cross-slope variations post-construction.These research outcomes provide a theoretical framework for optimizing the de-sign of precast pipe piles in highway reconstruction and expansion on soft ground.

关 键 词：公路工程 拓宽软土路堤 预制管桩 附加应力 沉降变形 

分 类 号：TU473[建筑科学—结构工程]