引言西安—南京铁路是我国西部大开发的头号工程，开通即达时速６０ｋｍ／ｈ，沿线经过地段有相当部分处于膨胀土地区，本单位承担施工的西南线Ｂ±３２标段，地处合肥市，位于膨胀土地区，下面结合本工程实际做法，浅述膨胀土路基施工技术。１膨胀土鉴别由于膨胀土在外观上 Introduction Xi’an-Nanjing Railway is the number one project in the development of western China. Its speed reaches 60km / h, and a considerable part of the area along the line is in expansive soil. The B ± 32 section of southwest line under construction of the unit is located in Hefei , Located in the expansive soil area, combined with the actual practice of the project below, on the expansive soil subgrade construction technology. Expansion of soil identification Expansion of soil in appearance