在双碳战略的重大战略部署下，对轨道交通全生命周期碳排放进行研究，合理量化其碳排放水平是实现交通部门碳达峰、碳中和的重要问题。本文基于北京某新建地铁线路，对轨道交通全生命周期碳排放进行分析，建立了轨道交通全线、全生命周期的碳排放计算模型，并定量计算了新建地铁线路全线、全生命周期的碳排放量。同时，对建设阶段和运营阶段的降碳措施做出分析，定量评估其降碳潜力。对全长81km新建地铁线路进行碳排放计算，得到建设阶段碳排放量为257万t CO2eq，运营阶段为5.4万t CO2eq /年，50年运营周期总计碳排放524万t CO2eq。建设阶段使用可再生材料及预制结构可减少碳排放7%；运营阶段综合采用多种节能降碳措施后，可降碳27%；50年运营周期降碳潜力总计17%。该模型的建立弥补了轨道交通全线、全生命周期碳排放计算领域的空白，对城轨交通全生命周期碳排放定量计算有指导意义。降碳措施的研究成果可为城轨交通实现绿色低碳转型、实现交通部门碳达峰、碳中和提供参考。

Under the major strategic deployment of dual-carbon strategy, to study the whole life cycle carbon emission of rail transit and to reasonably quantify its carbon emission level is an important issue to achieve peak carbon and carbon neutrality in the transportation sector. Based on a new metro line in Beijing, this paper analyzes the whole life cycle carbon emission of rail transit, establishes a carbon emission calculation model for the whole line and the whole life cycle of rail transit, and quantitatively calculates the carbon emission of the whole line and the whole life cycle of the new metro line. At the same time, the carbon reduction measures in the construction phase and operation phase are analyzed and their carbon reduction potential is quantitatively assessed. The carbon emission calculation for the 81km long new metro line yields a carbon emission of 2.57 million tons of CO2eq in the construction phase, 54,000 tons of CO2eq per year in the operation phase, and a total carbon emission of 5.24 million tons of CO2eq in the 50-year operation cycle. The use of renewable materials and prefabricated structures in the construction phase can reduce carbon emissions by 7%; the use of comprehensive carbon-reducing measures in the operation phase can reduce carbon by 27%; and the carbon reduction potential of the 50-year operation cycle totals 17%. The model bridges the gap in the field of carbon emission calculation for the whole line and whole life cycle of rail transit, and is of guidance to the quantitative calculation of carbon emission for the whole life cycle of urban rail transit. The research results of carbon reduction measures can provide references for urban rail transit to achieve green and low-carbon transformation, and to achieve carbon peaking and carbon neutrality in the transportation sector.

U231??????

北京市科委