The Corrosiveness of Shallow Soil to the Construction Materials of Rail Transit in Tianjin Binhai New Area

Based on the collected 268 groups of laboratory test data of soluble salts in the foundation soil of Tianjin Binhai New Area, the distribution law of sulfate ion, chloride ion, average salt content and pH in the shallow foundation soil with the depth of 35.0 m in the Binhai New Area is analyzed. Corrosivity of the foundation soil to the concrete and reinforcement in the main structure (segment) of the shield is analyzed, and then combined with the buried depth and position of the main structure of the shield section in rail transit, it is proposed that soil samples should be taken under the underground water level for soluble salt analysis test and corrosivity judgment. Measures and suggestions for anti-corrosion of the main structure in the shield section of underground rail transit are provided.