盾构渣土现场机制砂石生产与外运处置的碳排放对比及减排效益分析OA

The utilization of shield muck for manufactured sand and gravel(MSG)production holds significant potential for advancing the national strategy of resource conservation and promoting carbon peaking and carbon neutrality goals.However,current research in China on the carbon reduction potential of producing MSG from shield muck remains limited.This study takes a section of the Guangzhou-Huadu Intercity Railway as a case and employs a life cycle assessment(LCA)approach to establish a carbon emission accounting model for both off-site disposal and on-site MSG production from shield muck.Based on this model,the study systematically evaluates the carbon reduction benefits of on-site resource utilization compared to traditional off-site disposal and further estimates the carbon mitigation potential associated with the production and reuse of MSG.The results show that,compared to conventional off-site disposal(assuming a transport distance of 50 km),on-site MSG production from shield muck can reduce carbon emissions by more than 3.03 kg CO2 per ton.If all shield muck generated from the case section(1000 rings)is used for MSG production,the total carbon reduction benefit could reach approximately 10601 t CO2e.Furthermore,additional measures such as optimizing transport distances for MSG products and reusing dewatered filter cakes could further enhance carbon reduction.This study provides methodological support for the development of carbon reduction assessment frameworks and standards for the resource utilization of shield muck and offers scientific guidance for low-carbon decision-making in the MSG industry.