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