Safety Analysis of Foundation Pit Excavation on Adjacent High-Speed Railway Bridges

Wenhao Li

China Railway Siyuan Survey and Design Group Co. Ltd, Wuhan, 430063, China

Abstract: With the increase of the construction of local municipal engineering, more and more roads are in-tersecting with the bridge of high-speed railway, especially the U-shape pass through the existing railway bridge, the depth of the excavation is deep, and the construction risk is large. In this paper, an overpass related to railway in Shangqiu is taken as the research object, through qualitative analysis and three-dimensional quantitative calculation, the deformation of high speed railway pier during the excavation of the U-shape foundation is evaluated, meanwhile, guided by the measured results, the effectiveness of the calculation will be analyzed. The research shows that the deep foundation pit excavation will produce a large horizontal and vertical displacement to the foundation of the high-speed railway bridge. The negative effect of the foundation pit excavation can be obviously improved by the reinforcement of the high-pressure jet grouting pile and the pressure weight of the bearing platform.

Keywords: High-speed railway; Foundation pit excavation; Loading on bearing platform; U-shape; High-pressure jet grouting pile