Effect of Excavation Blasting in the Arch Cover Method on Adjacent Existing Pipelines in a Subway Station

The dynamic responses of existing pipelines are great significance to be studied in blasting excavation the arch cover method. In this paper, Shi Kui Subway Station Line 5 Dalian, China, is selected as a case study. A 3D numerical simulation model established analyze dynamics characteristics subjected vibration, with triangular pattern describing blast hole pressure. verified by comparing pipelines’ PPVs and field monitored points. Then, pilot tunnels, pipelines, secondary lining discussed. effects later tunnel on earlier remarkable when relative distance between them small. Extensive areas many charges will result large peak velocities short time, well decreased from tunnels. However, hollow effect can change these characteristics. implementation reduce lower rock blasted. most adverse position foot rather than crown waist; thus, should carried out at suitable age for concrete ensure safety structures pipelines.