软土地基公路改扩建数值模拟及施工技术研究

为分析改扩建路堤沉降变形规律及水平应力分布情况,实现对软土地基上公路改扩建施工的指导,通过FLAC3D软件对西南某高速公路在软土地基上的改扩建工程路堤进行三维沉降变形模拟。结果表明:“清淤换填+纵向台阶开挖+土工格栅铺垫”的施工关键技术及其控制措施,可有效控制新旧路基的沉降不均匀、水平拉应力分布不均匀、不对称和应力集中等问题,防止路基错台、开裂等病害的发生,施工效果良好。研究成果可为西南地区类似工程施工提供借鉴依据。

Research on Numerical Simulation and Construction Technology of Highway Reconstruction and Expansion on Soft Soil Foundation

To analyze the settlement deformation law and horizontal stress distribution of the embankment reconstruction and expansion,and realize the guidance for the highway reconstruction and expansion construction on soft soil foundation,the 3D settlement deformation simulation of a highway embankment reconstruction and expansion on soft soil foundation in Southwest China is carried out by FLAC3D software.The results indicates that the key construction technology and control measures of"dredging and replacement+longitudinal bench excavation+geogrid bedding"can effectively control the uneven settlement,uneven and asymmetric distribution of horizontal tensile stress,and stress concentration of the new and old subgrade,and prevent the occurrence of subgrade defects such as dislocation and cracking,and have good construction effect.The research results can provide reference for similar engineering construction in Southwest China.