- ISSN 0258-2724
- CN 51-1277/U
- EI Compendex
- Scopus
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| Citation: | MENG Fanqiang, GONG Xun, YE Zilin, ZHAO Liuhui, GONG Hao, WANG Dongmei, GONG Zhengjun. Construction of Model for Carbon Emissions and Analysis of Quantitative Characteristics for Whole Life Cycle of Railway Tunnel Engineering[J]. Journal of Southwest Jiaotong University. doi: 10.3969/j.issn.0258-2724.20250279
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Given the complex construction processes and significant procedural variations in railway tunnels, a model for accounting carbon emissions covering the engineering materialization phase and the operation and maintenance phase was established to accurately assess carbon emission characteristics throughout the whole life cycle of railway tunnel engineering and support specialized analysis and emission reduction strategies. Combined with the unit rate method by procedure and the carbon factor method by material, quantitative accounting and variance analysis of carbon emissions were conducted in a case study. Furthermore, Pareto analysis was employed to identify high-emission sectors and key influencing factors, realizing the decomposition and hierarchical management of carbon emissions. The results indicate that the total carbon emissions during the whole life cycle of the case tunnel engineering are 68.107 5 × 104 tCO2e, with the engineering materialization phase generating 59.404 0 × 104 tCO2e (accounting for 87.2%) and the operation and maintenance phase generating 8.703 5 × 104 tCO2e (accounting for 12.8%). During the engineering materialization phase, material production and on-site construction processes contribute up to 95.76% of the carbon emissions, among which the carbon emission intensity of drill-and-blast section construction is 13 843 tCO2e/km, and that of shield section construction is 39.8% of the former. During the operation and maintenance phase, the maintenance of ventilation systems, waterproofing and drainage systems, and reinforced concrete precast pipes accounts for 73.54% of the carbon emissions. In the whole life cycle, Class A carbon-emitting materials include ordinary cement 42.5 grade (high-performance concrete), ordinary cement 42.5 grade, and ribbed steel bars; Class A carbon-emitting machinery includes axial flow fans, rail-type internal combustion locomotives, and dump trucks; Class A carbon-emitting processes include the lining of shield section, the support of drill-and-blast section, and the support of shield section.
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