随着我国铁路不断的提速,铁路既有线的改造工作陆续开展,本文结合既有线改建工程,对既有线改建的路基施工工艺进行了阐述。 With the continuous speeding up of China’s railways, the reconstruction of the existing railway line has been carried out one after another. This paper describes the construction process of the subgrade with the reconstruction of the existing line by combining with the existing line reconstruction project.