About the author:

CCCC Third Harbor Bureau Ninth Engineering Co., Ltd., Chongqing 400012, China

Abstract:

To optimize the construction technology of widened subgrade and reduce the differentialsettlement of new and old subgrade, based on the widened subgrade project of Changyuan⁃XiuwuExpressway, the numerical simulation analysis model of widened subgrade is established by usingFLAC3D finite difference numerical simulation software to reveal the settlement law of subgrade andpavement during the construction and operation of widened subgrade of expressway. By changing thenumber and width of excavation steps of the old subgrade and the slope gradient of the new subgrade,different construction conditions of the widened subgrade were constructed, and the influence of differentfactors on the differential settlement of the widened subgrade of the expresswaywas analyzed. Thenumerical simulation results are in good agreement with the field monitoring results. The reliability of thenumerical model has been verified. The aim of the study is to optimize the design and constructionparameters of the widened roadbed and improve the quality and service life of the project.