基于LCA方法的半盖挖地铁车站物化阶段碳排放分析

Analysis of Carbon Emission at Materialization Stage of Semi-coverd Excavation Subway Station Based on LCA Method

当前我国的轨道交通行业正处在高速发展阶段,在“双碳”背景下,高速发展带来的减排压力也与日俱增。基于生命周期评价(Life Cycle Assessment,LCA)方法,将某半盖挖地铁车站的物化阶段进行单元分解,界定碳排放系统边界,构建出物化阶段的3个碳排放计算模型,定量分析了其物化阶段的碳排放特征及规律。研究发现:半盖挖地铁车站建筑材料生产阶段的碳排放占比为86.29%,建筑材料运输阶段占比为1.84%,施工阶段占比为11.87%。整个物化阶段,车站主体结构碳排放强度总额为3.51 tCO_(2)/m^(2),附属结构碳排放强度总额为1.83 tCO_(2)/m^(2)。根据计算结果,从建筑材料生产、运输方式、施工机械和能源使用方面提出了针对性的节能减排措施。

At present,China’s rail transit industry is at a stage of rapid development.Under the background of“carbon peak and carbon neutralization”,it is also facing increasing pressure to reduce emissions.Based on Life Cycle Assessment method,this paper decomposes the materialization stage of a semi covered metro station into units,defines the boundary of carbon emission system,constructs three carbon emission calculation models in the materialization stage,and quantitatively analyzes the characteristics and laws of carbon emissions in the materialization stage.It is found that the carbon emission of the construction materials production stage of the semi covered metro station accounts for 86.29%,the construction materials transportation stage accounts for 1.84%,and the construction stage accounts for 11.87%.Carbon emission intensity of main structure is 3.51 t CO_(2)/m^(2),and carbon emission intensity of auxiliary structure is 1.83 t CO_(2)/m^(2).According to the calculation results,targeted energy conservation and emission reduction measures are proposed from the aspects of building materials production,transportation mode,construction machinery and energy use.