Construction Risk Assessment of Metro Elevated Station Based on C-OWA Operator and Improved Extenics

Abstract

Metro viaduct station construction is a high-risk project in metro construction. In order to make its risk control more effective and the risk management more perfect, scientific and reasonable evaluation is needed. The main risk factors in the construction of metro elevated station are identified by delphi method. Based on this, a risk evaluation index system for the construction of metro elevated station is established, which includes seven first-class indexes: pile foundation construction, cap and equipment excavation, waterproof construction, scaffold erection, formwork construction, cast-in-situ main structure construction, platform and roof structure. The C-OWA operator is used to objectively weigh the indexes, and the extension theory is improved. The construction risk evaluation model of metro elevated station based on C-OWA operator and improved extension theory is constructed, which verifies the scientific rationality of the model. Taking an elevated station project of Qingdao metro as an example, the risk assessment results show that the risk assessment level of the construction of the elevated station of Qingdao metro is relatively high, and the main risk factors are: pile foundation construction, scaffolding erection, formwork construction, cast-in-place main structure construction, and the corresponding improvement suggestions are put forward.