Effect of Subway Tunnel Excavation by Drill-Blasting Method on Pipeline

Drill-blasting method is used in subway tunnel excavation, when the tunnel located in soils-tone assorted strata. However, the study on pipeline next to subway tunnel is not enough now, when drill-blasting excavation is used in subway tunnel construction. The stress and displacement of pipeline is studied, when blasting load is considered in FLAC3D software in subway tunnel excavation. In the study, pipeline characters have been considered. It shows that: (1) Because of the physico-mechanical parameters of pipeline and of soil stratum, when the position of pipeline and tunnel is vertical, displacement of pipeline less than when is horizontal. When the position is vertical, tension and compression stress of pipeline is bigger than that is horizontal. (2) During the excavation, the factors that affect on the stress of pipeline remarkably include diameters, thickness, materials, and joints. (3) The factors that affect on the displacement of pipeline significantly include diameter of pipeline, depth of pipeline, and joints.