针对泥水盾构施工过程中产生的大量弃浆，在传统压滤脱水—外运填埋处置模式下存在能耗高、碳排放量大及环境风险突出的工程问题，以盾构弃浆资源化利用为目标，提出一种将弃浆原位转化为流态盾构弃浆基同步注浆材料的技术路径。基于生命周期评价（LCA）方法，构建涵盖弃浆收集与筛分、调控搅拌、浆液制备及泵送注浆等全过程的碳足迹模型，并结合广花城际白方—方石区间大直径泥水盾构工程开展实证分析，对比传统弃浆处理与同步注浆模式下的碳排放特征及减排潜力。研究结果表明： 1）所提出的盾构弃浆资源化利用工艺在满足同步注浆材料流动性、凝结时间及强度等工程性能要求的同时，具备良好的施工适应性与稳定性。2）基于LCA构建的碳足迹模型能够系统量化各阶段碳排放贡献，其中浆液制备阶段碳排放占比最高，为全过程主要排放来源； 与传统弃浆处理及同步注浆模式相比，采用该资源化利用路径每环可减少碳排放11 369.16 kg CO_2eq，整体碳排放强度降低约14.04%。3）敏感性分析表明，原材料运输距离对碳排放的影响最为显著，其敏感度系数达0.59，而泵送设备工作效率对减碳具有正向促进作用，是优化碳排放的重要控制参数。综上，盾构弃浆原位资源化制备同步注浆材料在降低碳排放和减少弃浆处置规模方面具有显著优势。

To address the significant energy consumption, carbon emissions, and environmental risks associated with traditional treatment methods, a novel approach is proposed for recycling shield slurries to produce a flowable synchronous grouting material. Based on the life cycle assessment (LCA) method, a carbon footprint analysis model is constructed to encompass the entire process of slurry disposal, controlled mixing, slurry preparation, and pumping grouting. A case study is conducted on a large-diameter slurry shield tunnel project of the Baifang-Fangshi Section of the Guangzhou East Railway Station-Huadu Tiangui Intercity Railway, and the carbon emissions and carbon-reduction potential of different stages are systematically evaluated. The proposed resource-utilization process for shield waste slurry meets the engineering performance requirements of synchronous grouting material, such as fluidity, setting time, and strength, while exhibiting good construction adaptability and stability. In addition, the LCA-based carbon footprint model systematically quantifies the carbon-emission contributions of each stage, among which the slurry-preparation stage accounts for the largest share of carbon emissions. Compared with traditional disposal methods, recycling the slurry as a grouting material reduces carbon emissions by 11 369.16 kg CO_2eq per ring, resulting in a total carbon-emission reduction of about 14.04%. Furthermore, sensitivity analysis indicates that the transportation distance of raw materials has the greatest impact on carbon emissions, with a sensitivity coefficient of 0.59. In addition, the working efficiency of the pumping equipment has a positive effect on carbon reduction and is a key control parameter for reducing emissions. In summary, the insitu resource utilization of shield waste slurry for preparing synchronous grouting material exhibits significant advantages in reducing carbon emissions and minimizing the scale of waste slurry disposal.