针对公路隧道全电气化成套装备降碳机理不清、微观动态核算边界缺失的工程痛点，量化复杂地质条件下全电气化成套装备施工作业的碳减排潜力与其底层物理演变机制。依托云南巧家隧道高地应力、超大埋深等复杂地质，基于生命周期评价（LCA）框架与高频设备运行日志参数，构建收敛至“现场施工机械”单元的微观动态碳排放量核算模型。通过现场实测与多源数据交叉验证，在同等作业边界下对全电气化成套装备与传统燃油-气动混合机群的能流演变与碳排放量进行高分辨率定量对比分析。结果表明： 1）相较于传统工艺全电气化成套装备作业模式具备跨越式碳减排效能。在案例标段内，新型机械集群共实现绝对温室气体减排量2 564.5 tCO2eq，相对减排率达81.51%。2）灵敏度分析表明，该减排效益对跨区域电网碳排放因子漂移与短期工效波动具备良好的工程稳健性。3）显著的降碳协同效益本质上源于深部受限空间“能流拓扑结构”的重构，纯电直驱不仅弥补了传统内燃机的热效率短板，还从根本上消除了长距离气动管网的多级能量损耗；其作业终端的“零尾气”特性，可有效降低除稀释炮烟外的叠加通风负荷，进一步削减系统的辅助能耗。

To address the engineering challenges such as the unclear carbon reduction mechanisms and missing micro-dynamic accounting boundaries for fully electrified integrated equipment systems in highway tunnels, the carbon emission reduction potential and its underlying physical evolution mechanism of fully electrified construction operations under complex geological conditions are quantified. Based on the complex geology featuring high insitu stress and great burial depth of the Qiaojia Tunnel in Yunnan, China, a micro-dynamic carbon emission accounting model converged to the “onsite construction machinery” unit is established using the life cycle assessment framework and high-frequency equipment operation log parameters. Through field measurements and cross-validation of multi-source data, a high-resolution quantitative comparison is conducted on the energy flow evolution and carbon emissions between the fully electrified integrated equipment system and the conventional dieselpneumatic hybrid machinery cluster under identical operational boundaries. The results show that: (1) Compared to traditional processes, the operational mode of the fully electrified integrated equipment system can achieve a leapfrog carbon reduction efficiency. Within the case study section, the new machinery cluster achieves an absolute greenhouse gas reduction of 2 564.5 tCO_2eq, with a relative reduction rate as high as 81.51%. (2) Sensitivity analysis indicates that this emission reduction exhibits strong engineering robustness against cross-regional grid carbon emission factor drift and short-term productivity fluctuations. (3) The significant synergistic carbon reduction benefits essentially stem from the reconstruction of the “energy flow topology” in deep confined spaces, pure electric direct drive not only bridges the thermal efficiency generation gap of traditional internal combustion engines, but also fundamentally eliminates multi-stage energy losses in long-distance pneumatic pipelines. Furthermore, its “zero exhaust” characteristic at the operation terminals effectively reduces the superimposed ventilation load other than the dilution of blasting fumes, thereby further lowering the auxiliary energy consumption of the system.