为揭示铁路隧道工程碳排放领域研究现状和未来发展趋势，采用文献计量和知识图谱方法对铁路隧道工程碳排放领域研究进展进行综述，对其热点问题及未来发展进行研究。基于2008—2022年Web of Science数据库的铁路隧道工程碳排放文献，采用CiteSpace与VOSviewer计量分析软件，对其发文量、被引频次及Web of Science类别分布进行统计分析，并从机构合作网络、关键词共现及检测突现词3个方面对样本文献数据进行可视化知识图谱研究。结果表明： 1）2008—2022年，铁路隧道工程碳排放相关文献数量有波折，总体上呈现先缓后急的增长趋势，文献被引次数呈现显著增长趋势，研究重点主要集中在隧道建设期碳排放计算方面，隧道运营维护阶段的碳排放核算不确定性较大； 2）在低碳材料和低碳施工措施研究方面，隧道施工减碳分析研究较多，减排效应研究较少； 3）碳排放评价方面，以生命周期评价方法和综合评价法为主，但评价指标没有统一标准。通过前沿分析可知，在铁路隧道碳排放计算标准、碳排放因子、碳排放评估预测、优化施工方案及机械设备等方面研究潜力大。

To reveal the current status and future development trend of research in the field of carbon emissions from railway tunnel engineering, a systematic review of the current research, hot topics, and future developments in the field of railway carbon emissions is conducted based on the theoretical approach of bibliometrics and knowledge mapping. Based on the literature on railway carbon emissions in the Web of Science database from 2008 to 2022, the statistical analysis of the number of articles, frequency of citations, and Web of Science category distribution of railway carbon emissions research literature is conducted using CiteSpace and VOSviewer econometric analysis software. The data are analyzed visually in four aspects, including institutional cooperation network, cooccurrence of subject terms, cocitation of literature, and detection of emergent words. The results show the following: (1) The number of publications of railway carbon emissionrelated literature fluctuated during the period 20082022, with an overall trend of slow and then sharp growth. The number of citations of literature showed a significant growth trend. The research focused mainly on the calculation of carbon emissions during the tunnel construction period, and the uncertainty of carbon emission accounting during the tunnel operation and maintenance phase was large. (2) In the research of lowcarbon materials and lowcarbon construction measures, there were more research on the analysis of tunnel construction carbon reduction, and less research on the analysis of specific targeted emission reduction effects. (3) In terms of the evaluation of carbon emissions, the lifecycle evaluation method and the comprehensive evaluation method were the main ones, but there was no standardized standard for the evaluation indexes. Through the analysis of the frontiers, it can be seen that there is a huge research potential in the future in the establishment of carbon emission calculation standards for railway tunnels, improving the data of carbon emission factors, evaluating and predicting carbon emissions, optimizing the construction scheme and mechanical equipment, and so on