中文摘要：

目前,隧道碳排放主要是通过规划设计阶段的估算或竣工后隧道整体排放量的统计得到,较少考虑每一环隧道碳排放的差异性及其影响因素。文章基于排放系数法,对虹梅南路隧道施工现场能耗进行实时统计,计算出了该隧道工程建造阶段每一环实际碳排放,并结合地层与施工参数对施工碳排放环与环之间的差异性进行了分析探讨。结果表明：（1）盾构施工平均每环碳排放约为56 t,其中材料碳排放约占93%。背景工程通过埋深分档、减少构造钢筋等措施减少了约12 000 t碳排放（即200环的排放量）;（2）对于施工碳排放,72粉砂层中由于穿行阻力大、刀盘扭矩高、粉砂对于泥浆破坏强等因素导致隧道每环排放量约为53粘质粉土层中的一倍。通过避免将隧道长距离埋设于72层粉砂中可以有效降低其碳排放量值,而盾构推进距离、隧道埋深对其影响不大;（3）盾构停顿一天产生的碳排放约为4 400 kg,隧道施工过程中应着力提高盾构推进效率,避免盾构机长时间的停顿。盾构的日平均进度保证在3环以上,相比1环日平均进度可减少至少60%的环平均排放量。

英文摘要：

In tunnel engineering at present, carbon emissions are generally estimated during the planning design stage or obtained by statistics of total emissions after completion. However, the difference of carbon emissions in each ring and relevant influential factors are seldom considered. For this paper, based on the emission coefficient method, real-time statistics were determined regarding the in-situ energy consumption of the South Hongmei Road tunnel, and the actual carbon emissions per ring were obtained. Furthermore, the difference of the actual carbon emissions in each ring is analyzed and discussed by considering the parameters of stratum and construction. The results show that： 1） the average carbon emission per ring of shield tunnelling is about 56 t, with material-generated carbon emissions being around 93%, and for the studied case the carbon emission was reduced by approximately 12 000 t（corresponding to the total emissions produced by 200 rings） by means of depth grading and steel-bar reduction; 2） for construction-generated carbon emissions, shield tunnelling in the 72 silty sand layer features high penetration resistance, high cutterhead torque, and highly damaging effects on the slurry, so its carbon emission per ring is about twice of that of the 53 clayey silt layer, and the carbon emissions can be effectively reduced by avoiding a long-distance tunnel buried in the 72 silty sand layer, while the shield advance distance and the buried depth have little effect; and 3） the carbon emissions generated by a one-day stop of shield driving is about 4 400 kg, it is therefore important to improve the advancing efficiency of the shield and to avoid long shield stoppages during tunnel construction. The daily average shield advance rate should be more than three rings—this can reduce the average emissions per ring by at least 60% compared with a one-ring advance rate per day.