Life Cycle Analysis of Urban Rail Transit Project Sustainable Development

As an urban infrastructure, rail transit has the advantages of high efficiency, environmental protection, punctuality and dense stations, gradually becoming the backbone of urban public transport. However, in the construction and operation process, negative effects such as policy change, extended construction period, overdraft and quality defects have become key obstacles to the sustainable development of urban rail transit. Therefore, based on the analysis of China's national conditions and literature, this paper constructs a triangle-cone sustainable concept model for the policy-oriented PPP industry of urban rail transit, determining 4 dimensions and 17 evaluation indexes of sustainable evaluation. Finally, the stage analysis of urban rail transit sustainable development is carried out in the form of fishbone diagram, and its sustainable development is further considered from the perspective of the whole life cycle.