关键词: 隧道工程, 安全影响评估, 市政高架桥, 轨道结构, 二维有限元, 三维有限元

Abstract: With the rapid development of urban traffic, it is inevitable that the new municipal road will have a safety impact on the existing underground rail structure. How to accurately assess the impact degree and whether there will be safety problems are very important to ensure the safe operation of existing track structures during the construction and operation stages of municipal roads. Based on the background of a proposed municipal road project in Chongqing which spanned the existing track structure, using the method of two-dimensional finite element analysis with three-dimensional finite element analysis, the calculation and analysis of the displacement and deformation of the track structure as well as other related safety impacts of the most unfavorable section of the viaduct affecting the track line interval were carried out, and the safety impact of the proposed municipal road viaduct on the existing track structure was studied. The conclusion of the study shows that the safety impact of the proposed municipal road on the existing track structure is acceptable.

Key words: tunnel engineering, safety impact assessment, municipal viaduct, track structure, two-dimensional finite element, three-dimensional finite element