Study on the engineering geological problems of Nantong Metro and the construction countermeasure

Abstract

The special geological structure formed by the interactive sedimentation of the Yangtze river brings many potential engineering problems during the subway construction. It is particularly important to carry out the identification of the key layer of geological structure that affects the subway construction to ensure the safety of the project. Based on the geological data of Nantong Metro Line 1, two-dimensional geological model is established to carry out the geological suitability zoning of the project along the subway line, and the key geological formations in different regions are systematically identified. The results show that the key layer group is the thick water-rich sand layer, weak silt soil layer and the newly deposited soil layer in the area, which mainly faces the engineering water hazard problems such as substrate subsidence deformation, permeation deformation and saltwater corrosion. This study provides a reference for subway construction under similar geological conditions.