Abstract

As an increasing demand for rapid railway transportation, the construction of sidetrackis inevitable to operate local and express trains simultaneously. However, the currenttechnologies for the sidetrack construction method require a long construction periodby interrupting the operation of the existing subway line, as well as cause a hugeeconomic loss. Thus, it is necessary to study the sidetrack construction method underthe special situation that the subway is in operation and to analyze the risk of theexisting tunnel enlargement process for the sidetrack construction. Therefore, in thispaper, the Government Complex Gwacheon station on Subway Line 4 was consideredas a target station for the virtual sidetrack construction and the optimal sidetrackconstruction plan was derived. Subsequently, the application of risk managementprocess was carried out in the order of identifying risk, risk response planning,performing a risk analysis, risk monitoring and control for potential risk events duringthe construction of sidetrack under the subway operation. A total of eight potential riskevents and risk mitigation methods were selected, and a risk assessment matrix was established using the five-step risk probability and impact level criteria to perform the risk assessment includingresidual risks. Based on the results of the risk assessment, the risk grade and the reduction effect of each risk mitigationmethod were confirmed.