Abstract: Improved comprehensive evaluation system of urban rail transit can promote high-quality development of urban rail transit. Herein, a green and low-carbon coupling evaluation method covering the whole life cycle of station buildings, vehicle-track tunnels, and passing trains is proposed based on the characteristics of urban rail transit flow space, centering on the concept of "green and low-carbon". The green evaluation part uses the expert survey method to establish a full-scene, full-process, and all-round green evaluation system including the whole life cycle of design, construction, and operation involving convenient commuting service, comfortable artificial environment, resource conservation and utilization, and ecological environment protection. The analytic hierarchy process is used to calculate the index weights and yield the subjective evaluation score. The low-carbon evaluation part establishes the carbon emission accounting boundary based on the whole life cycle theory, and uses the carbon emission factor method to calculate the carbon emissions in each stage of building materials production, construction, and operation. The annual per capita carbon emissions are introduced as an evaluation indicator to objectively calculate the carbon emission intensity. Finally, a case study is conducted on a station in Beijing, and the coupling evaluation model is verified, thus calculating its green evaluation score and annual per capita carbon emissions. The results show that the green and low-carbon coupling evaluation results of the station are 243 points for green evaluation and 17.2 tCO₂e per 10 000 people for annual per capita carbon emissions. To comprehensively improve the overall green performance of the station and effectively reduce carbon emissions, a full-process optimization plan for the station is proposed, which ultimately increases the green evaluation score to 271 points and significantly reduces the annual per capita carbon emissions to 13.3 tCOe per 10 000 people.

Key words: urban rail transit, whole life cycle, dynamic space, green evaluation, carbon emission calculation