矩形顶管隧道施工碳排放计算方法及影响因素研究

Study on Calculation Method and Influencing Factors of Carbon Emission during Construction of Rectangular Pipe-jacking Tunnels

依托莆田火车站站前广场矩形顶管工程,基于全生命周期理论框架并结合排放系数法,研究矩形顶管隧道的施工碳排放计算方法及影响因素。研究结果表明:水泥、钢铁和电力是矩形顶管隧道施工中主要的碳排放来源,隧道顶进长度与工程总碳排放量呈正比关系,但与每延米碳排放量呈反比关系,其中顶进长度从224 m增加到424 m时,每延米碳排放量减排最多,减幅超过26%;当管片宽度从1.2 m增加到2.4 m,管节防水碳排放量减幅达到72%;同一开挖长度情况下,管片宽度从1.2 m增加到1.5 m的减排效益最好,最大减幅为4.3%,管片宽度超过1.5 m时,每延米碳排放量的减排幅度不再显著。

Based on the rectangular pipe jacking project at the square in front of Putian Railway Station and using the life cycle theory framework combined with the emission coefficient method,this study investigates the calcula⁃tion method and influencing factors of carbon emissions during the construction of rectangular pipe-jacking tunnels.The research indicates that cement,steel,and electricity are the primary sources of carbon emissions during the con⁃struction of rectangular pipe-jacking tunnels.The jacking length of the tunnel is directly proportional to the total carbon emissions of the project,but inversely proportional to the carbon emissions per meter.When the jacking length increases from 224 m to 424 m,the carbon emissions per meter decrease the most,with a reduction of over 26%.When the segment width increases from 1.2 m to 2.4 m,the carbon emissions in terms of segment waterproofing decrease by up to 72%.For the same excavation length,increasing the segment width from 1.2 m to 1.5 m provides the best carbon emission reduction benefits,with a maximum reduction of 4.3%.When the segment width exceeds 1.5 m,the reduction in carbon emissions per meter is no longer significant.